Fig 4 - uploaded by Raghu Shant
Content may be subject to copyright.
(a) Charpy Impact Test, (b) Charpy V-notch Geometry(c) Notch Dimensions [5].

(a) Charpy Impact Test, (b) Charpy V-notch Geometry(c) Notch Dimensions [5].

Source publication
Article
Full-text available
The thick wall linepipes produced from thermo-mechanical-controlled hot-rolled high-strength low-alloy steel (HSLA) plates are characterized by heterogeneity of microstructures through thickness. This microstructural heterogeneity results delamination and is responsible for substantial differences in the toughness behavior of the linepipe steel. Th...

Context in source publication

Context 1
... Charpy V-notch testing of linepipe steels is carried out according to ASTM E23 (American Society for Testing of Material) [6]. The standard full-size specimen (10 mm × 10 mm × 55 mm, a 45° V-notch of 2 mm depth and a 0.25 mm root radius) is hit by a pendulum at the opposite end of the notch as shown in Figure 4 [5]. The pendulum, set at a certain height, is released to impact the specimen at the opposite end of the notch to fracture the specimen in two parts. ...

Similar publications

Article
Full-text available
In the present study, instrumented drop weight impact tests at different impact energies were performed to investigate the modes and mechanisms of the low velocity impact damage in plain weave woven glass fiber reinforced plastic (GFRP) composite laminates. 8-ply, 16-ply, 24-ply and 32-ply laminates having identical 0 o layup were examined via opti...
Article
Full-text available
The presented research was devoted to determining the influence of impactor geometry on the degree and character of failure of a glass fibre reinforced epoxy matrix subjected to low-velocity impact. Furthermore, the relevance of impact energy and lay-up configuration of each composite plate were analysed. The subject of the tests were autoclave man...
Article
Strength and toughness are a couple of paradox as similar as strength-ductility trade-off in homogenous materials, body-centered-cubic steels in particular. Here we report a simple way to get ultrahigh toughness without sacrificing strength. By simple alloying design and hot rolling the 5Mn3Al steels in ferrite/austenite dual phase temperature regi...
Conference Paper
Full-text available
The electrical sensitivity of a multiscale glass fiber reinforced polymer composite containing a hierarchically structured carbon nanotube (CNT) network, to self-sense damage under low velocity impact loading is investigated. The multiscale composites were manufactured into two hierarchical architectures depending on the location of the CNTs: a)...
Article
Full-text available
In this study, different tubular braided and filament wound structures were produced using a Maypole braiding machine with glass fiber and then consolidated with unsaturated polyester resin using the Vacuum Infusion Process (VIP). For experimental tests, half of the samples were impacted in the center with 2.74 J impact energy. Then the compression...

Citations

... It is difficult to eliminate during heating and rolling [4,5]. Many studies [6][7][8][9][10][11][12][13][14][15][16] suggested that centerline segregation decreases the mechanical performance of final products, such as: Low temperature toughness, weldability, and resistance to sour gas worsen; delamination fracture and band structure increase. References [17][18][19][20] suggested that control of centerline segregation in continuously cast slab can effectively improve low temperature toughness and elongation of pipeline steel. ...
Article
Full-text available
Low variability in mechanical properties is required for pipeline project designs to meet a strain-based design, which is used in regions of large ground movements. The objective of this study is to elucidate the influence of centerline segregation in continuously cast slab on variability in the mechanical property of pipeline steel, and controlling centerline segregation can meet the requirements of a strain-based design. Mannesmann rating method was used to evaluate the degree of segregation of two slabs and its effect on variability in mechanical properties of corresponding plates. Microstructural characterization indicated that bainite/martensite was formed in a segregated area where the content of C and Mn enriched. The mechanical property results indicated that controlling the degree of centerline segregation can reduce tensile strength variability and improve ductile-brittle transition temperature (DBTT).
Chapter
API 5L X70 line pipe steel grade has been very popular for the pipe manufacturing in sour/non-sour and offshore/onshore applications. This steel is available in various delivery conditions such as controlled rolling and TMCP with or without accelerated cooling. The selection of plate or coil depends on the type of pipe manufacturing and its final application. Co-relation of steel microstructure with tensile and toughness properties, before and after pipe manufacturing is required for the selection of suitable steel for a given application. For a given application and pipe manufacturing process, steel cleanliness, and allowance for Bauschinger effect, strain hardening, SCC and HIC resistance plays a prominent role. Present work is about microstructure and its co-relation with properties for X70 steel plates and coils supplied by 12 steel mills. Evaluation of alloy design with respect to microstructural features and its effect on tensile and toughness properties change from plate/coil to pipe is discussed.