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中文摘要：
在形变温度为550～700℃、应变速率为0.000 1～0.100 0 s-1范围内,对B340/590DP双相钢拼焊板进行温单向拉伸试验和金相分析试验,研究双相钢拼焊板变形条件和晶粒尺寸之间的关系.基于Z参数建立了双相钢拼焊板母材和热影响区的晶粒尺寸数学模型,研究温拉伸条件下双相钢拼焊板晶粒尺寸的变化规律.结果表明：应变速率越低、形变温度越高,双相钢拼焊板动态再结晶现象越明显,母材和热影响区晶粒尺寸越大;将该模型导入ABAQUS软件,通过试验和仿真结果比较,验证了所建晶粒尺寸模型的准确性,通过此模型可以预测不同变形条件下双相钢拼焊板母材和热影响区的晶粒尺寸.
英文摘要：
The tensile properties and microstructures of dual phase steel laser TWBs were investigated at temperatures range from 550 to 700 ℃ and strain rate range from 0. 000 1 to 0. 100 0 s^-1 The correlation of deformation conditions and grain size were discussed. Based on Z parameter, the grain size models of base metal and heat-affected zone of dual phase steel laser TWBs were established to investigate the variations of grain size. The results show that as strain rate decreases or temperature increases, the dynamic recrystallization becomes stronger, and the grain size of base metal and beat-affected zone of dual phase steel laser TWBs grows bigger. The models were introduced into the software of ABAQUS to verify the accuracy of the grain size models by comparing the simulated and measured values. The variation of grain size of base metal and heat-affected zone of dual phase steel TWBs can be predicted by the proposed models under different deformation conditions.
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