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.
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