Effect of transient change in strain rate on plastic flow behaviour of low carbon steel

Bulletin of materials science

P Mukherjee¹  A Sarkar¹  S K Bandyopadhyay¹  A Ray¹  P Barat¹ 

[1]Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700 064, India$$Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700 064, IndiaVariable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700 064, India$$

关键词: Steels;    stressâ€�?�strain measurement;    plastic flow;    mechanical properties;    metallurgy.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Plastic flow behaviour of low carbon steel has been studied at room temperature during tensile deformation by varying the initial strain rate of 3.3 �? 10^-4 s^-1 to a final strain rate ranging from 1.33 �? 10^-3 s^-1 to 2 �? 10^-3 s^-1 at a fixed engineering strain of 12%. Haasen plot revealed that the mobile dislocation density remained almost invariant at the juncture where there was a sudden increase in stress with a change in strain rate and the plastic flow was solely dependent on the velocity of mobile dislocations. In that critical regime, the variation of stress with time was fitted with a Boltzmann type Sigmoid function. The increase in stress was found to increase with final strain rate and the time elapsed in attaining these stress values showed a decreasing trend. Both of these parameters saturated asymptotically at a higher final strain rate.

【 授权许可】

Unknown