摘要
本文探讨了高速钢在高温形变过程中碳化物析出的行为及奥氏体组织状态对析出的影响。用透射电镜和扫描电镜分析了不同热处理状态奥氏体的组织结构,分析了高温形变过程中碳化物析出的部位,颗粒尺寸及形态。试验表明, 碳化物主要在奥氏体的缺陷处呈点状和点列状析出,大小为20mμ。处于回复状态的奥氏体缺陷诱发碳化物析出,析出碳化物钉札缺陷阻止再结晶进行。当再结晶驱动力较大时,由于动态再结晶充分发展,使缺陷大量消除,碳化物析出显著地减少。
This paper deals with the behavior of alloy carbides and the effect of microstructure of austenites on the precipitates during high temperature deformation of high-speed steel. The precipitate location'particale size and shape of the alloy carbides are analysed by means of TEM and SEM. The experimental resuts show that the alloy carbides mainly precipitate in defects of austenites in the form of spots or spot range. The particle size of the carbides is about 20mμ The defects of austenites in the recovery state induce carbide precipitation, and the precipitated carbides pin the defects and inhibit the recrystallization of austenites, when the driving force of recrystallization becomes greater, the amount of the precipitated carbides obviously decreases; due to full development of dynamic recrystallczation, resulting in many defects in austenites vanishirng.
关键词
高速钢
高温形变
碳化物
high-speed steel
precipitation induced by high-temperature deformation
carbides
size
shape
distribution,
