利用BaehrDIL805高精度差分膨胀仪,通过对线膨胀行为的测量与分析,获得相关动力学信息,系统研究了不同淬火速率(10～6000℃/min)对T91铁素体耐热钢马氏体转变开始温度Ms的影响.研究表明:不同淬火速率对T91钢的Ms有较大影响,淬火速率为10～50℃/min时Ms点较高,并保持平稳;100～2000℃/min时,Ms相对减小,并随淬火速率的增加呈降低趋势;速率为3000～6000℃/min的快速淬火时,Ms点急剧下降,并随速率的增加呈上升趋势.这种现象与碳原子气团、淬火空位和淬火内应力有关.
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