摘要
以汽车用先进高强度Q&P钢为研究对象,分析了应变速率对Q&P钢拉伸性能及变形行为的影响。结果表明,随应变速率增加,Q&P钢的强度增加,断裂延伸率则呈先下降(10-4s-1～10s-1),后上升至峰值(8×10s-1),之后再下降(102s-1～103s-1)的趋势。变形过程中强度的增加可能同形变回复受限,位错运动受阻有关。而断裂延伸率的变化主要与不同应变速率下Q&P钢中残余奥氏体向马氏体转变(即TRIP效应)有关。
Using advanced high-strength quenching and partitioning steel for automobile industry as research ob- ject, the effect of strain rate on tensile properties and influenced by was investigated. The results show that the strength of Q＆P steel increases with increasing strain rate, while the elongation declines （10^-4s～10s^-1） at first, then rises to the peak （8×10^2^-1） and then falls again （10^2s^-1～10^3S^-1）. The increase in strength is mainly due to the restraint of deformation recovery and dislocation movement during deformation, while the variation of elongation is mainly related to the transformation from retained austenite to martensite （namely the TRIP effect） in Q＆P steel at different strain rates.
出处
《特钢技术》
CAS
2012年第3期18-22,共5页
Special Steel Technology
关键词
Q&P钢
应变速率
拉伸性能
TRIP效应
残余奥氏体
Quenching and partitioning steel, Strain rate, Tensile property, TRIP effect, Retained austenite
