摘要
为了揭示温变形工艺参数对双相钢拼焊板宏观力学性能及组织演变的影响规律,在不同变形温度和应变速率条件下对DP590双相钢拼焊板进行温拉伸试验和微观组织观察,将变形温度和应变速率对材料温成形过程的综合影响统一为Zener-Hollomon(Z)参数来研究材料宏观力学性能和微观组织演变.实验结果表明,随着Z参数的降低,材料越容易发生动态再结晶,流变应力-应变曲线越低,断后延伸率逐渐提高,平均晶粒尺寸有长大的趋势.本研究对于通过Z参数优化DP590双相钢拼焊板温变形宏观力学性能和微观组织具有一定的参考价值.
To understand the effect of process parameters on the mechanical properties and microstructure evolution of dual-phase（DP） steel tailor welded blanks（TWBs） during warm deforming,the warm tensile tests at different temperatures and strain rates were carried out.The mechanical properties and microstructure evolution of DP590 steel TWBs during warm tensile tests were influenced by temperature and strain rate,and all of those factors were reflected by Zener-Hollomon（Z） parameter.The results indicated that at the range of given experimental Z parameter,due to the dynamic recrystallization,the lower the Z parameter,the lower the stress-strain curves,and as Z parameter decreased,the elongation at fracture,the volume fraction of recrystallization and average grain size increased.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2012年第2期112-116,共5页
Materials Science and Technology
基金
国家自然科学基金资助项目(50775102)
上海市数字化汽车车身工程重点实验室开放基金课题(200903)
关键词
双相钢拼焊板
温成形
Z参数
微观组织
宏观力学性能
tailor-welded blanks
warm forming
Zener-Hollomon parameter
microstructure evolution
mechanical properties
