Strain rate and temperature dependence of low temperature superplastic deformation in a nanostructured microalloyed steel

被引：11
|
作者：
Wang, Tong [1 ]
Hu, Jun [2 ]
Du, Lin-Xiu [2 ]
Sun, Guo-Sheng [2 ]
Misra, R. D. K. [3 ]
机构：
[1] Northeastern Univ, Key Lab Electromagnet Proc Mat, Minist Educ, Shenyang 110819, Liaoning, Peoples R China
[2] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Liaoning, Peoples R China
[3] Univ Texas El Paso, Dept Met Mat & Biomed Engn, Lab Excellence Adv Steel Res, El Paso, TX 79968 USA
来源：
MATERIALS LETTERS | 2019年 / 243卷
基金：
中国国家自然科学基金;
关键词：
Low temperature superplasticity; Nano-structured steel; Microstructure; Grain boundaries; Strain rate; Grain boundary sliding; CU;
D O I：
10.1016/j.matlet.2019.02.044
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The low temperature plasticity behavior of a nanostructured microalloyed steel was studied at varied deformation temperatures and strain rates. Tensile condition of 500 degrees C (0.33 melting point) and 0.00005 s (1) led to superplastic flow with a low peak stress of 140 MPa and a high elongation of 202%. The ultra-fine equiaxed ferrite kept high misorientation grain boundaries and absent of dislocations subjected to superplastic strain, accounted for grain boundary sliding mechanisms. Slip deformation was required at strain rate of 0.00025 s (1) or deformation temperature of 450 degrees C based on a relatively high dislocation density. Low temperature superplasticity in NG/UFG steel was highly strain rate and temperature dependent. (C) 2019 Elsevier B.V. All rights reserved.
引用
收藏
页码：165 / 168
页数：4
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