Rajesh K. Khatirkar

Rajesh K. Khatirkar
Visvesvaraya National Institute of Technology | NIT, Nagpur · Department of Metallurgical and Materials Engineering

Ph.D.

About

84
Publications
29,626
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,164
Citations
Additional affiliations
May 2006 - December 2015
Visvesvaraya National Institute of Technology
Position
  • Professor (Assistant)

Publications

Publications (84)
Article
Full-text available
In the present work, effect of heat treatment on microstructure and corrosion behaviour of a high Mo containing α + β titanium alloy (Ti-6Al-1V-4Mo-0.1Si) has been investigated. Heat treatment results in the formation of wide variety of microstructure depending on the heating temperature (below or above the β transus) and cooling conditions. Marten...
Article
Full-text available
In the present work, changes in microstructure, texture and magnetic properties during unidirectional cold rolling of a Fe-21Cr-5Mn-1.5Ni alloy were investigated. For microstructural characterization, scanning electron microscope (SEM) and electron backscattered diffraction (EBSD) were used, while for bulk texture measurements, X-ray diffraction (X...
Article
The influence of cutting speed and temperature softening was extensively investigated for conventional cutting process. However, this has not been addressed adequately for micro-cutting, especially of the single crystals, where the depth of cut is in the same range or even smaller than the average grain size of a polycrystalline aggregate. To this...
Article
In the present work, microstructure and texture evolution during plastic deformation and annealing treatment of near beta (β), meta-stable β, and stable β-Ti alloys are reviewed. The evolution of microstructural features such as shear bands (SBs), martensite (α′′/α′), dislocations and precipitation (omega (ω), and alpha (α) phases) during plastic d...
Article
UNS S32101 lean duplex stainless steel (DSS) has a two phase microstructure consisting of austenite and ferrite in near equal proportions. Aging at high temperature results in formation of σ phase reducing ductility and also corresponding depletion of Cr from the matrix. The effect of long term aging on the microstructure and mechanical properties...
Article
The application of vacuum in casting technology is very limited. In the present scenario, the vacuum is mainly used in die casting or investment casting, but the application of vacuum in sand casting is not known yet. In the present investigation, the author did a sand casting process under a vacuum, where the melting and pouring of metals were car...
Article
In the present investigation, hot deformation behaviour of Fe–21Cr-1.5Ni–5Mn alloy was studied by performing isothermal unidirectional hot compression tests. The tests were carried out at strain rates of 0.01, 0.1, 1, 5 and 10 s⁻¹ and at temperatures of 675, 750, 825, 900, 975 and 1050 °C. The samples were deformed up to 50% height reduction (ε = 0...
Article
Forming limit diagrams (FLDs) are widely used in sheet metal industries to assess formability. These are graphical representations of major and minor strains on a 2-D plot separating safe and unsafe regions. Limiting strains were measured by digital image correlation (DIC) technique. In the present work, microstructure evolution and forming behavio...
Article
A single-phase Beta-C titanium alloy was subjected to uniaxial compression (up to 75% height reduction) in a universal tensile testing machine at room temperature. The evolution of microstructure during uniaxial cold compression was studied using optical microscopy, scanning electron microscopy, and electron backscattered diffraction, while, bulk c...
Article
Super duplex stainless steel (UNS S32750) butt joints were prepared using ER2594 and ER2595 electrodes by shielded metal arc welding (SMAW) process. The heat input used during welding was in the range of 0.75–0.81 kJ/mm. Microstructure and texture across the weldments were investigated using optical microscope, scanning electron microscope, and ele...
Article
Mechanical and fluid assisted (hydro-mechanical) deep drawing operations were performed on drawing quality (DQ) and interstitial free (IF) steels at various forming depths. The evolving microstructure in terms of textural developments, in-grain misorientations and residual stresses measurements were significantly different between the two grades an...
Article
The present study investigates the effect of homogenization on microstructures and texture evolution in a TRC i. e. twin roll cast Al-Fe-Si aluminum alloy (AA8011). TRC AA8011 alloy with an initial thickness of 7 mm was cold rolled upto 50% thickness reduction and homogenized at 580 • C for different times (4h, 8h, and 12h). The initially elongated...
Article
Full-text available
In the present study, effect of multistep cross rolling (MSCR) on microstructure, texture, and magnetic properties has been investigated for UNS S32101 steel. UNS S32101 steel consisting of almost equal proportion of ferrite and austenite was 80% cold cross rolled in multiple steps. The microstructures were characterized using optical microscopy (O...
Article
Microstructure evolution and texture development during cold rolling of a Ti15333 alloy were systematically investigated in the present work. Texture was simulated using mean-field [Visco-Plastic Self-Consistent (VPSC) and Taylor] models. Evolution of crystallographic texture was also simulated using the Visco-Plastic Fast Fourier Transform (VPFFT)...
Article
In the present work, drawing quality (DQ) and interstitial-free (IF) steel sheets were subjected to limiting dome height tests for determining strain-based forming limit diagrams (FLDs) experimentally and effect of dynamic (variable) material properties, such as work hardening ‘n’ and plastic anisotropy (\(\bar{r}\)), on FLDs has been studied and s...
Research Proposal
Most of the research work on Ti alloys consists of microstructure evolution during cold/hot rolling, flow stress at high temperature, DRX, structural stability at high temperature etc. Further, metastable β-Ti alloys consists of second phase (primary and secondary alpha) and deformation heterogeneities (slip bands, shear bands), which can play an i...
Article
In the present work, microstructure and texture evolution during multi-step cross rolling of a β-Ti alloy was investigated. The as-received samples were cross rolled in a laboratory rolling mill to 20%, 40%, 60% and 80% thickness reduction. Optical microscopy (OM) and scanning electron microscopy (SEM) were used to observe the changes in microstruc...
Article
Ferrite (δ) in two-phase austenite–ferrite Fe–Cr–Ni alloys decomposes into Mo- and Cr-rich phases like sigma (σ) and chi (χ), when aged in the temperature range of 873–1273 K (600–1000 °C). The precipitation of these phases for a particular Fe-Cr-Ni alloy has an adverse effect on its mechanical properties and corrosion resistance. In the present wo...
Article
Sheet metal forming depends on the key material properties namely strain hardening exponent (n) and planar/normal anisotropy. In this work, a comparative study has been performed between the room temperature and elevated temperature tensile tests of ASS 304 steel samples. Uniaxial tensile tests were conducted on along three directions, along rollin...
Article
In the present work, the microstructure and texture evolution of interstitial free (IF) steel during cold rolling was studied experimentally and also through simulations. Stored energy and geometrically necessary dislocation (GND) density maps were calculated from the electron backscattered diffraction (EBSD) data. The evolution of crystallographic...
Article
For good deep drawability in aluminium and its alloys, a proper balance of deformation and recrystallization texture components is essestial in the final material. This balance of deformation and recrystallization texture can only be achieved by properly controlling the thermo-mechanical processing of the alloy. In the present study, microstructure...
Article
In the present investigation, evolution of microstructure and texture was studied for a β titanium alloy during cold rolling (unidirectional rolling (UDR) and cross rolling (multi-step cross rolling (MSCR) and two step cross rolling). For both UDR and MSCR of initially hot rolled alloy consisting of elongated and equiaxed grain structure, the occur...
Article
Full-text available
In the present work, a b-Ti alloy (Ti-15V-3Sn-3Cr-3Al) was unidirectionally cold rolled to 80% thickness reduction, followed by recrystallization at two temperatures: (i) 1013 K and (ii) 1053 K. The microstructural developments were studied using light optical microscopy, scanning electron microscopy X-ray peak profile analysis, and electron backsc...
Article
In the present work, a b-Ti alloy (Ti-15V-3Sn-3Cr-3Al) was unidirectionally cold rolled to 80% thickness reduction, followed by recrystallization at two temperatures: (i) 1013 K and (ii) 1053 K. The microstructural developments were studied using light optical microscopy, scanning electron microscopy X-ray peak profile analysis, and electron backsc...
Article
In the present investigation, evolution of microstructure and texture was studied for a β titanium alloy during cold rolling (unidirectional rolling (UDR) and cross rolling (multi-step cross rolling (MSCR) and two step cross rolling). For both UDR and MSCR of initially hot rolled alloy consisting of elongated and equiaxed grain structure, the occur...
Article
In the present investigation, the plastic flow curves and work softening behaviour of a dual phase Fe–Cr–Ni alloy during hot deformation (low to intermediate temperature range, 948 K (675°C) to 1248 K (975°C)) along with concurrent microstructural development were investigated. The flow stress increased with the increase in strain rate and decrease...
Article
Recent trend in additive manufacturing of Ti-6Al-4V alloy is to alter the microstructure by changing process parameters or by the addition of alloying elements to achieve the required performance. In the present investigation direct metal laser sintering (DMLS) processed Ti-6Al-4V alloy with addition of varying amount of TiB2 has been successfully...
Article
Full-text available
In the present work, UNS S32750 super duplex stainless steel sheets were welded by shielded metal arc welding process with E2595 electrode using two different heat inputs, 0.54 and 1.10 kJ/mm. Microstructural investigations (optical and scanning electron microscopy) showed very small differences in the heat affected zone for both the heat inputs. T...
Article
In the present investigation, ER2594 (conventional) and ER2595 (consisting of additional Cu and W) electrodes were used to produce butt joints of 5.5 mm thick super duplex stainless steel (UNS S32750) sheets using shielded metal arc welding (SMAW) process. During SMAW process, the heat input was 0.81 kJ mm⁻¹ for ER2594 electrode and 0.75 kJ mm⁻¹ fo...
Article
In the present work, the influence of strain path on the evolution of microstructure, crystallographic texture, and magnetic properties of a two-phase Fe-Cr-Ni alloy was investigated. The Fe-Cr-Ni alloy had nearly equal proportion of austenite and ferrite and was cold rolled up to a true strain of 1.6 (thickness reduction) using two different strai...
Article
Texture development during multi-step cross rolling of a dual-phase Fe–Cr–Ni alloy has been investigated. X-ray diffraction was used to investigate changes in crystallographic texture of both the constituent phases (austenite and ferrite) through changes in orientation distribution function. After deformation, rotated brass (rotated along φ1, i.e....
Article
Texture development during multi-step cross rolling of a dual-phase Fe-Cr-Ni alloy has been investigated. X-ray diffraction was used to investigate changes in crystallographic texture of both the constituent phases (austenite and ferrite) through changes in orientation distribution function. After deformation, rotated brass (rotated along φ 1 , i.e...
Article
In the present work, the effect of cooling rate on the evolution of the microstructure and mechanical properties of an α + β titanium alloy has been systematically investigated. Titanium alloy samples were heated to 1066 °C (above the β transus), 930 °C (just below the β transus), and 850 °C (well below the β transus) followed by oil quenching, air...
Article
Full-text available
In the present work, UNS S32750 super duplex stainless steel sheets were welded by shielded metal arc welding process with E2595 electrode using two different heat inputs, 0.54 and 1.10 kJ/mm. Microstructural investigations (optical and scanning electron microscopy) showed very small differences in the heat affected zone for both the heat inputs. T...
Article
Full-text available
The friction and abrasive wear of plasma sprayed Al2O3-13TiO2 coating, with and without the addition of graphite was investigated. XPS analysis was used to determine the extent of γ-α Al2O3 phase transformation after wear. γ-α Al2O3 phase transformation had different influence on friction and wear of coatings. Al2O3-13TiO2+15% Ni Graphite coating e...
Article
Cr2O3-25TiO2 coating was deposited by atmospheric plasma spray (APS) coating technique. Effect of load (5–30 N) and sliding velocity (0.25, 0.75 m s−1) on friction coefficient and abrasive wear behaviour of the Cr2O3-25TiO2 coating wasstudied. Mechanical and microstructural characterization of the Cr2O3-25TiO2 coating was carried out. With an incre...
Article
In the present work, the effect of cooling rate on the evolution of the microstructure and mechanical properties of an alpha+beta titanium alloy has been systematically investigated. Titanium alloy samples were heated to 1066°C (above the beta transus), 930°C (just below the beta transus), and 850°C (well below the beta transus) followed by oil que...
Article
Full-text available
In the present work, dissimilar welding between UNS S32205 duplex stainless steel (DSS) and 316L austenitic stainless steel (ASS) was performed by using gas tungsten arc welding and ER2209 filler at two different heat inputs (0.52 and 0.98 kJ/mm). Microstructures were characterized using reflected light optical microscope and scanning electron micr...
Article
In the present work, evolution of microstructure and crystallographic texture during cold rolling of two phase Fe–Cr–Ni alloy was investigated. Fe–Cr–Ni alloy (in initially solution annealed condition) was uni-directionally cold rolled in a laboratory rolling mill to different thickness reductions. Scanning electron microscopy was used to observe t...
Article
In the present study, microstructure and texture evolution during cold rolling in UNS S32205 and UNS S32760 duplex stainless steel was investigated. Both steels were unidirectionally cold rolled up to 80 pct thickness reduction. Scanning electron microscopy and electron backscattered diffraction (EBSD) were used for microstructural characterization...
Article
In the present study, dissimilar alloys such as Mg-AZ31B and Al-AA6061 were joined by friction stir welding using different rotational (560,710, 860 and 1010 rpm) and transverse speed (16 and 25 mm/min). Metallographic studies (by optical, scanning electron microscope and energy dispersive spectrometer) revealed that the speed parameters mainly inf...
Article
Full-text available
In the present work erosive and abrasive wear behaviour of HVOF deposited WC-12Co, WC–10Co–4Cr and Cr3C2−25NiCr coatings was investigated. The maximum wear rate was exhibited by Cr3C2−25NiCr coating under both solid particle erosion and abrasion. The coatings exhibited composite erosion response. The erosion response was rationalized on the basis o...
Article
In the present investigation, ultra low carbon steel samples were deformed in plane strain compression mode in a deformation simulator. The deformation was carried out at four different temperatures in the warm rolling region (293, 473, 673 and 873 K) upto 70% strain at two different strain rates (0.1/s and 1/s). Subsequently, all the deformed samp...
Article
A new method, referred to as the cluster method, is proposed and tested for the reconstruction of pre-transformation microstructure in Ti–6Al–4V alloy. The cluster method begins by constructing clusters of daughter grains (room-temperature hcp α-phase) that have a high probability of being transformed from the same parent grain (high-temperature bc...
Article
There are many industrial situations particularly in petro-chemical, marine, power plant and other such industries where the use of dissimilar metal weldments is necessary, mainly due to economic benefits and also sometimes to improve the performance of the component. Both austenitic stainless steels and duplex stainless steels have received much a...
Article
Full-text available
In the present study, the weldability, microstructures and mechanical properties of dissimilar welds (2205 austeno-ferritic and 316L austenitic stainless steel) was investigated by using shielded metal arc welding (SMAW) with the help of two different electrodes namely duplex (E2209) and austenitic (E309L). After welding, the microstructure of the...
Article
Full-text available
Hardfaced martensitic stainless steel alloy was deposited on mild steel substrate by flux cored arc welding method. The slurry abrasion studies of weld-deposited hardfaced steel were performed using slurry abrasion test rig with 250-300m silica sand particles. The effect of weld compositional gradation on the abrasive wear resistance of hardfaced s...
Article
AA3004 aluminium alloy is most widely used in the beverage industry due to its excellent deep drawing properties and corrosion resistance. During deep drawing of the AA3004 sheets, the ‘earing phenomenon’ has to be minimized for economic advantage. In AA3004 and modified AA3004 alloys (like AA3104), this can be achieved by tailoring the crystallogr...
Article
This paper investigates the effect of quenching and aging treatment on microstructure and abrasive wear of Ti-6Al-4V alloy. The as-received alloy was solution treated at 1339 K, then oil quenched, followed by aging at 823 K for 4 h (14,400 s). The microstructures of as-received and quench-aged specimens were characterized by using optical microscop...
Article
Full-text available
The effect of heat treatment on microstructure and abrasive wear resistance of AISI D2 steel has been investigated in the present work. The structural characterization of hardened and multiple tempered specimens was carried out using scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). Two body abras...
Article
Full-text available
The effect of heat treatment on the corrosion resistance of AISI 304L stainless steel is studied in the present investigation. As-received samples of 304L stainless steel were solution annealed at 1 050 degrees C for 90 minutes followed by thermal ageing at 750 degrees C for various time durations (upto 24 days). ASTM standard A-262 practice A test...
Article
Full-text available
Chrome-Manganese steel is relatively new steel as compared to its counterpart 304 series stainless steels. There are relatively few studies on the welding behaviour of low nickel Cr-Mn stainless steel (in particular, on the effect of heat input on the microstructural developments). In the present investigation, a low nickel chrome-manganese stainle...
Conference Paper
Full-text available
In last couple of years the consumption of 200-series austenitic stainless steels increased by a great amount. Most of the nickel in 200-series stainless steel is replaced by manganese and therefore possesses a lower amount of nickel in its composition. Thus it holds a lower cost as compared to 300-series stainless steel. Also 200-series stainless...
Article
Full-text available
Wear by slurry abrasion is very expansive problem that must be taken into consideration while selecting the material for the transportation of slurry through pipeline. Abrasive wear generally occurs when abrasive slurries come in contact with the industrial engineering components or slurry transporting pipes. The abrasive particles carried by slurr...
Article
The engineering components are subjected to surface damage by slurry abrasion such as transportation pipes carrying ore and mineral slurries, extruders, sand pumps and agitators, Apart from stress, abrasive particle hardness, slurry concentration, particle size and shape significantly influences slurry abrasion rate. The effect of abrasive particle...
Article
Full-text available
Ni-Cr-Mo steels are widely used in machine part members, gears and shafts. Steels with higher carbon content (similar to 1%) are used for heavy machine parts and bearings. Abrasive wear resistance is often a very important requirement for these high carbon steels, apart from sliding wear properties. In the present study, En31 steel was subjected to...
Article
Full-text available
The recrystallization kinetics and microstructure evolution after unidirectional and multi-step cross rolling of interstitial free high strength steel has been investigated systematically. Microhardness, electron backscattered diffraction and X-ray diffraction was used to characterize the recrystallization kinetics, microstructure and texture evolu...
Article
Full-text available
Hot band, fully recrystallized, interstitial free (IF) steel samples were cold rolled to 10-80% thickness reductions. After characterizing the developments in deformed microstructures, 50-80% deformed samples were fully recrystallized at 650°C. Though different annealing times were used, use of a relatively lower annealing temperature and repeated...
Article
Full-text available
Cold rolled (40, 60 and 80% thickness reductions from hot-band) interstitial free (IF) steel samples were recovered at 500°C for different times (15 min to 32 h). The recovery kinetics, studied through a combination of X-ray line profile analysis and high resolution electron diffraction, were best represented by logarithmic relationship. Though the...
Thesis
Full-text available
In this study, the effect of isothermal aging at 700°C on the microstructural changes in 2205 duplex stainless steel has been investigated systematically. In addition, the influence of prestraining and subsequent aging on the precipitation behaviour has been overviewed. Scanning electron microscopy and X-ray diffraction were adopted to follow the m...