摘要
以GCr15轴承钢为研究对象,在实验室条件下研究了冷却工艺参数对组织转变温度及显微组织的影响。研究结果表明:随冷却速度提高,二次碳化物及珠光体转变温度区间减小,马氏体转变温度区间增大,二次碳化物形态逐渐由网状演变为点状、线条状,珠光体形态逐渐由片层状演化为团絮状,20℃/s时珠光体转变结束温度仍高于550℃。当冷却速度为5℃/s时已发生马氏体转变。在保证终冷温度条件下,以8~16℃/s冷却速度冷却时均可获得以团絮状珠光体为主,辅以在晶界弥散分布的尺寸小于5μm,含量低于3.3%马奥岛显微组织。
The effects of different cooling process on phase transformation temperature and microstructure of GCr15 bearing steel were studied in laboratory.The results indicate that,with cooling rate increasing,the transformation temperature range of secondary carbides and pearlite reduces,while the martensite transformation temperature range increases.With cooling rate increasing,the secondary carbide morphology gradually evolves from nets into dots and lines,and the pearlite morphology gradually evolves from layer-mesostructure into pearlite nodule.When the cooling rate reaches 20℃/s,the pearlite transformation finish temperature is still higher than 550℃.Martensite transformation has occurred when the cooling rate reaches 5℃/s.When the finished cooling temperature is higher than 550℃,the microstructure is mainly pearlite nodules and dispersively distributed martensite-austenite island at 8~16℃/s,which is less than 5μm and 3.3%,respectively.
作者
张敏
Zhang min(Steel rolling plant of Xinjiang Tianshan iron&steel Bazhou Co.,Ltd)
出处
《冶金管理》
2021年第7期28-30,共3页
China Steel Focus
关键词
GCR15轴承钢
冷却速度
组织转变
马奥岛
二次碳化物
GCr15 bearing steel
cooling rate
phase transformation
martensite-austenite island
secondary carbide
