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Abhishek Raj

Bio: Abhishek Raj is an academic researcher from Tata Steel. The author has contributed to research in topics: Ultimate tensile strength & Fatigue limit. The author has an hindex of 4, co-authored 9 publications receiving 52 citations. Previous affiliations of Abhishek Raj include Indian Institute of Technology Bombay.

Papers
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Journal ArticleDOI
Surajit Kumar Paul1, Abhishek Raj1, P. Biswas1, G. Manikandan1, Rahul K. Verma1 
TL;DR: In this article, the tensile characteristics of auto grade low carbon, ultra low carbon and micro alloyed steel sheets under low to intermediate strain rates ranging from 0.0007 to 250 s � 1.

38 citations

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TL;DR: In this paper, the authors assess tensile and high cycle fatigue performance of dual-phase (DP590) steel subjected to uniaxial and equi-biaxial pre-strain.

15 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of short duration tempering on the microstructure and mechanical properties of a continuously annealed dual phase steel was investigated using techniques like electron microscopy, dilatometry and thermodynamic calculations.
Abstract: The effect of short duration tempering on the microstructure and mechanical properties of a continuously annealed dual phase steel was investigated using techniques like electron microscopy, dilatometry and thermodynamic calculations. It was found that a complex interplay of phenomena like tempering of martensite, quench aging of ferrite and recovery of the overall structure was responsible for the change in mechanical properties recorded.

11 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a failure criteria for sheet metal forming analysis, which is one of the most commonly used failure criteria in sheet metal form analysis, based on the formation limit diagram.
Abstract: Forming limit diagram is one of the most commonly used failure criteria for sheet metal forming analysis. Forming limit diagram generation is time-consuming, and therefore, any reduction in the tes...

7 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of the 10% uniaxial and equi-biaxial tensile pre-strain on the notch fatigue performance of DP590 steel is investigated.

4 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the effects of deformation temperature and strain rate on the hot tensile deformation behaviors and fracture characteristics are discussed in detail, and the Arrhenius-type constitutive model is developed to predict the peak stress under the tested deformation condition.

121 citations

01 Feb 2005
TL;DR: A method for the visualization of plastic deformation in electron back-scattered diffraction (EBSD) data has been developed and is described in this article based on mapping the intragrain misorientation in polycrystalline metals.
Abstract: The ability to map plastic deformation around high strain gradient microstructural features is central in studying phenomena such as fatigue and stress corrosion cracking. A method for the visualization of plastic deformation in electron back-scattered diffraction (EBSD) data has been developed and is described in this article. This technique is based on mapping the intragrain misorientation in polycrystalline metals. The algorithm maps the scalar misorientation between a local minimum misorientation reference pixel and every other pixel within an individual grain. A map around the corner of a Vickers indentation in 304 stainless steel was used as a test case. Several algorithms for EBSD mapping were then applied to the deformation distributions around air fatigue and stress corrosion cracks in 304 stainless steel. Using this technique, clear visualization of a deformation zone around high strain gradient microstructural features (crack tips, indentations, etc.) is possible with standard EBSD data.

115 citations

Journal ArticleDOI
TL;DR: In this paper, three dimensional finite element (FE) models are developed to predict the true stress-strain relationships of Q420 steel beyond necking under different strain rates by a hybrid experimental-numerical method.

44 citations

Journal ArticleDOI
Long Yang1, Ningfei Wang1, Xie Kan1, Xin Sui1, Li Shipeng1 
TL;DR: In this article, the authors used the Ree-Eyring model to predict the yield behavior of composite modified double base (CMDB) propellant over a wide range of strain rates.

36 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the effects of shielding gas composition on microstructure, impact toughness, and microhardness distribution of transition zone between AH36 steel and weld metal of joined material.
Abstract: In this study, AISI 316 L austenitic stainless steel and AH36 low-alloy ship building steel pair were joined with flux-cored arc welding method by using E309LT1-1/4 filler metal under four different shielding gas compositions containing CO2 at different ratios. Microstructure, impact toughness of welded materials, and their microhardness distribution throughout joining were determined. In macro- and microstructure examinations, stereo optical microscope, scanning electron microscope (SEM), SEM/energy dispersive spectroscopy, and SEM/mapping analysis techniques were used. After notched impact toughness, fracture surfaces were examined using the scanning electron microscope. This study investigated effects of shielding gas composition on microstructure, impact toughness, and microhardness distribution of transition zone between AH36 steel and weld metal of joined material. It is observed that based on an increase in amount of CO2 in shielding gas, impact toughness values of the weldment decreased. Microhardness values change throughout weld metal depended on shielding gas composition. Moreover, an increase in amount of CO2 within shielding gas decreased δ-ferrite amount in weld metal. The increase in amount of CO2 within shielding gas leads to expanded transition zone in interface between AH36 and weld metal and also affects notched impact toughness values negatively due to the inclusion amounts occurring in weld metal and hence caused it to decrease.

28 citations