摘要
分别从化学成分、热处理工况和金相组织等方面对不合格产品与合格产品进行了对比分析,结果表明,低温韧性不合格的主要原因是金相组织中存在较多的碳化物堆积。通过热处理工艺试验发现,冷却速度慢会导致碳化物堆积数量增加。在冷速有限的情况下,通过延长回火低温等温时间可以有效改善碳化物堆积状况,提升锻件低温韧性。
The comparative analysis on unqualified and qualified products has been performed from the aspects of chemical composition, heat treatment condition and metallographic structure. The results show that the main reason for the unqualification of low temperature toughness is that there is more carbide accumulation in the metallographic struc- ture. The heat treatment process test has been taken to find that the slow cooling rate can increase the amount of car- bide accumulation. In the case of limited cooling speed, the states of carbide accumulation can be effectively improved by prolonging the isothermal time at low temperature, and the low temperature toughness of the forgings can be raised.
出处
《大型铸锻件》
2017年第1期29-32,35,共5页
Heavy Casting and Forging
关键词
低温韧性
碳化物堆积
回火
low temperature toughness
carbides accumulation
tempering
