对热成形硼钢进行高温拉伸及淬火实验.试验方法为:硼钢板材试样在奥氏体化(950℃)后保温5 min,然后在连续冷却的同时施加拉伸力,记录此过程中力、位移、膨胀量及温度的变化.试验结果表明,当应力小于某个值时,马氏体相变开始温度、转变速率材料常数及相变塑性系数基本不变;当应力在一定范围内变化时,上述物理量随应力的增加而增加;当应力大于某个值时,上述物理量趋于定值;当应力达到400 MPa时,马氏体相变开始温度达到565℃,提高了180℃左右.在分析上述物理量的变化规律与马氏体形核影响因素的基础上,发展了热成形硼钢相变过程中的热、力、相变耦合本构模型.
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