本文利用磁性法和膨胀法研究了GCr15钢M_s点以下贝氏体转变动力学以及不同温度预转变马氏体对240℃等温时贝氏体转变动力学的影响。试验结果表明,过冷奥氏体在M_s点以下等温过程中首先形成变温马氏体,继而转变为下贝氏体。随着等温温度的降低和预淬马氏体数量的增加,应力促发作用有助于贝氏体转变的加速,200℃左右其孕育期最短。但是,当温度继续下降、预淬马氏体超过一定数量之后,贝氏体转变却愈趋困难,此外,M_s点以下不同温度的预转变马氏体对随后240℃等温时贝氏体转变动力学影响的研究结果,也具有相同的特性。
The kinetics of bainitic transformation of GCr15 steel below M_s andthe influence of the pre-transformed martensite formed at different temperatures onit at 240℃ isothermally have been investigated by means of magnetic measurementand dilatometry. The supercooled austenite transforms firstly into martensite and thenlower bainite during isothermal process below M_s. With the decrease of isothermaltemperature and the increase of pre-transformed martensite, the bainitic transforma-tion is accelerated by stress-induction effect, and the incubation period is the shor-test at about 200℃. However, the bainitic transformation becomes rather difficult,if the temperature is continued to decrease and the pre-transformed martensite exce-eds a certain limit. Moreover, it seems in a similar manner of the pre-transformedmartensite increased at different temperatures below M_s to be influenced on the su-bsequent bainitic transformation at 240℃ isothermally.
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