Advanced Materials Research

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ISSN 1022-6680

Publications in this journal

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    ABSTRACT: Abstract. The austenisation and quenching behaviors of a medium-Mn steel with a chemical composition of C 0.14% and Mn 5.0% were presented in this paper. The heating and holding temperature varied from 500oC to 950oC was applied to find the austenization temperature. The holding time varied from 1-5minutes was used to choose the suitable austenisation time. Air cooling were applied to check the hardening capacity of the studied steel. It was found that the tensile strength is lower than 900Mpa and total elongation varied from 20-30% when the austenisation temperature is lower than 700oC. However, the tensile strength could be high up to 1600MPa and the total elongation about 12% when the austenisation temperature is higher than 700oC with air cooling. Based on the low austenisation temperature and the air hardening capacity, it was proposed that the studied medium-Mn steel could be used as the hot stamping steel in the car industry.
    Advanced Materials Research 06/2015;
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    ABSTRACT: We carried out simulations of contact interaction between BCC iron crystallite and various pure FCC metals under shear loading by means of molecular dynamics. It was shown that the result of this interaction is the transformation of FCC atomic lattice of contacted material into BCC one within a thin layer in the contact zone. The results of simulations can be used to control strength of the interfacial layers of coated materials, as well as to understand the processes which are taking place in surface layers of materials under the contact.
    Advanced Materials Research 02/2015; 1098:110-114.
  • Advanced Materials Research 01/2015; 1060:74-78.
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    ABSTRACT: The Carbon-Carbon composites are nothing but the composites, in which Carbon Fibres are reinforced into a Carbon Matrix. The usage of Carbon-Carbon composite materials is gaining the significant position in the fabrication of Missiles, Space Shuttles and other advanced structures.These materials are primarily expensive in nature, and the drilling cost of these materials will increase the manufacturing cost of the final product. Hence care should be taken in drilling of these materials. The cutting process parameters should be chosen carefully to minimize the damage and improve the quality of the hole drilled. Surface roughness is the most serious problem in the drilling process of Carbon-Carbon composites. This paper discusses the comprehensive analysis of surface finish and the influence of various process parameters as spindle speed, feed rate and drill bit point angle on the surface finish of the drilled holes. These experiments were carried out on a CNC drilling machine at Anna university campus, Chennai, India. The drilling of Carbon-Carbon composite material has been done by using three different drill bit materials i.e. TiN coated carbide,Solid carbide and High Speed Steel tools with three different point angles. The Analysis of variance technique is used to study the significance of each process parameter on the performance characteristic surface roughness. A L27 orthogonal array is employed to study the influence of process parameters. This paper also presents the comparison of the surface roughness values of drilled holes obtained by using the three different tool materials.
    Advanced Materials Research 01/2015; 1077:96-105.
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    ABSTRACT: Abstract. Research on the preparation of ceria based material for electrolyte of solid oxide fuel cell has been conducted. The Sm0.2Ce0.8O1.9 (SDC) was prepared by sol-gel method and the layered composites of SDC with Y0.08Zr0.92O3-δ were prepared by screen printing method. This research aims to study the crystal structure and its conductivity character. XRD measurement equipped with Le Bail refinement shows that SDC is crystallized in cubic structure with space group of Fm3m. The addition of YSZ into SDC does not change its crystal structure. However, the cell parameter of SDC is reduced from 5.434036(2) Å to 5.433(0) Å. At 600 °C, SDC has electronic conductivity that indicates the presence of electrons migration that can promotes short circuit during fuel cell operation. The combination of SDC with YSZ forming a layered composite of SDC-YSZSDC could reduce the electronic conductivity, even though its ionic conductivity is also become lower than single SDC at the same temperature.
    Advanced Materials Research 01/2015; 1101:15-19.
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    ABSTRACT: Abstract: The advantages and disadvantages of the conventional hot stamping steel and the hot tamping technology were shortly reviewed. It was proposed that new type steel with relative low austenization temperature and air hardening ability should be designed and produced to overcome the surface oxidation and avoid the complexity of cooling system of the stamping dies. In this study, it was shown that the 3rd generation sheet steel with medium-Mn composition could be austenized and pressed at 700-750℃ and air cooled into automobile parts with strength no less than 1.5GPa and ductility larger than 12%. This new steel and corresponding forming technology were called warm stamping technology, which overcomes the disadvantages of the conventional hot stamping steel. The fabrication trials of the automobile parts in the automobile industries were demonstrated with high strength and relative good ductility. It was concluded that the 3rd generation sheet steel and the warm stamping technology could be applied to replace the conventional hot stamping steel and conventional hot stamping technology in near future.
    Advanced Materials Research 01/2015; 1063:219-222.