Carbon-Dislocation Interaction-Induced Abnormal Strain-Rate Sensitivity in Twinning-Induced Plasticity Steels

被引：6
|
作者：
Li, Y. Z. [1 ,2 ]
Huang, M. X. [1 ,2 ]
机构：
[1] Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China
[2] Univ Hong Kong, Shenzhen Inst Res & Innovat, Shenzhen, Peoples R China
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2019年 / 50A卷 / 06期
基金：
中国国家自然科学基金;
关键词：
PROBE TOMOGRAPHY CHARACTERIZATION; SOLUTE SEGREGATION; DEFORMATION; EVOLUTION; STRESS; TWINS; MODEL; SLIP;
D O I：
10.1007/s11661-019-05179-z
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The existence of an abnormal transition in the strain-rate sensitivity of yield stress occurring at the strain rate approximate to 0.05 s(-1) of a C-added twinning-induced plasticity (TWIP) steel is demonstrated for the first time. The theoretical model in this work shows that the yielding of C-added TWIP steels is governed by the kink-pair nucleation mechanism overcoming the pinning of C solutes at a critical strain rate. However, the yielding at quasi-static strain rates ((epsilon)over dot <0.05 s(-1)) is controlled by the C solute dragging mechanism. The present model highlights the fundamental role of C-dislocation interaction in the deformation mechanism of TWIP steels. (C) The Minerals, Metals & Materials Society and ASM International 2019
引用
收藏
页码：2570 / 2575
页数：6
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