摘要
通过力学性能分析及显微组织观察,对比了淬火＋回火（QT）,一次两相区淬火＋一次淬火＋回火（LQT）,一次淬火＋一次两相区淬火＋回火（QLT）三种热处理工艺对大厚度超高强度690 MPa级海洋工程用钢板组织性能的影响。结果表明,3种不同淬火＋回火工艺对690 MPa级海洋工程用钢的低温冲击性能影响不同,其中采用一次淬火＋回火工艺不能保证大厚度海洋工程钢板的低温冲击性能,尤其是不能保证钢板心部低温冲击性能,采用一次两相区淬火＋一次淬火＋回火（LQT）工艺能够一定程度提升钢板的低温冲击性能,一次淬火＋两相区二次淬火＋回火（QLT）工艺结果最理想,能够大幅度提高钢板的低温冲击性能,同时,还能够获得最好的强韧匹配,其中细化晶粒及适合的显微组织状态是决定钢板优良低温冲击性能的关键因素。
Effect of three different heat treatment processes,including quenching ＋ tempering（ QT）,low temperature quenching ＋ quenching ＋tempering（ LQT）,quenching ＋ low temperature quenching ＋ tempering（ QLT）,on the microstructure and mechanical properties of heavy thickness 690 MPa grade marine engineering steel plate was studied.The results show that for the 690 MPa grade marine engineering steel the low temperature toughness are different by using three different heat treatment processes.For the QT process,the low temperature toughness cannot be guaranteed,especially for the 1/2 position of the plate.The LQT process helps to improve the low temperature toughness of the steel plate in some extent.For the QLT process,the result is the best.The process helps to improve the low temperature toughness and obtains the best match between the strength and toughness.Refining grains and proper microstructure are the key factors of determining the low temperature toughness of the steel plate.
作者
张鹏
严玲
周成
朱隆浩
Zhang Peng;Yan Ling;Zhou Cheng;Zhu Longhao(Ansteel Group Research Institute,State Key Laboratory of Metal Material For Marine Equipment and Application,Anshan Liaoning 114021,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第10期107-110,共4页
Heat Treatment of Metals
关键词
两相区淬火
大厚度
海洋工程用钢
低温冲击性能
细化晶粒
高密度位错
low temperature quenching
heavy thickness
marine engineering steel
low temperature toughness
grain refining
high density dislocation
