Influence of cold rolling on microstructure, texture and mechanical properties of low carbon high Mn TWIP steel

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:615

Article

Tewary, N. K.¹  Ghosh, S. K.¹  Bera, Supriya²  Chakrabarti, D.³  Chatterjee, S.¹ 

[1] Indian Inst Engn Sci & Technol, Dept Met & Mat Engn, Howrah 711103, India

[2] Natl Inst Technol, Dept Met & Mat Engn, Burdwan 713209, W Bengal, India

[3] Indian Inst Technol, Dept Met & Mat Engn, Kharagpur 721302, W Bengal, India

关键词: TWIP steel;    Cold rolling;    Microstructure;    Texture;    Mechanical properties;   

DOI  :  10.1016/j.msea.2014.07.088

来源: Elsevier

【 摘 要 】

The present study deals with the influence of cold rolling on microstructure, texture and mechanical properties of low carbon high Mn TWIP steel. It is noticed that the hardness, yield strength and tensile strength of the specimens increase whereas percentage elongation decreases as the amount of cold rolling reduction increases. The fully austenite phase with the average grain size of about 55 mu m along with annealing twins became fragmented and flattened when subjected to 10-50% cold deformation. The cold deformation results in the evolution of sub-structure, comprising dislocations, twins as well as interaction of dislocations and twins. The hot rolled and air cooled sample (0% cold deformation) reveals gamma-fibre ([111]//ND) texture, whereas cold rolled samples shows Goss texture ({110}[001]) and Brass texture ({110}[112]) components, which are expected after cold deformation of austenitic steels having lower stacking fault energy in the range of 15-40 mJ/m(2). X-ray line profile analysis through extended convolution multiple whole profile fitting method is utilised to quantify the dislocation density and planar fault (twin) probability for the cold rolled samples with different degree of reduction. Fractography shows that with the increase in cold deformation, fractures become more and more brittle in nature. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free