摘要
研究了轧后在线淬火＋离线回火（DQ-T）对12MnNiVR容器钢显微组织及力学性能的影响.结果表明,在线淬火至300℃获得的组织以条状贝氏体为主,淬火至30℃的组织为马氏体加贝氏体.经离线回火,原始带状下贝氏体为回火索氏体替代,同时析出大量微小FexC粒子.在630~710℃区间,随着回火温度的升高,屈服强度和硬度急速降低,而低温韧性明显提升.回火时间增加,强度下降,韧性增强.在最佳DQ-T工艺条件下：容器钢的ReH为660MPa,Rm为700MPa,A为19.4%,Akv（-20℃）为104 J.
The effects of DQ-T（direct quenching-tempering） on the microstructure and mechanical properties of 12MnNiVR steel were investigated.The results showed that the main structure is bainite when quenched directly to 300 ℃,and is martensite when quenched to 30 ℃.After the offline tempering,the original ribbon lower bainite organization is replaced by tempered sorbite and lots of tiny FexC particles precipitated.With the increase of temperature in tempering process,the yield strength and hardness sharply decreases,and the toughness（-20 ℃） increases.With the increasing of tempering time,the strength reduces and the toughness increases.With the optimum DQ-T process,the yield strength,tensile strength,elongation rate and impact energy（-20 ℃） are 660 MPa,700 MPa,19.4% and 104 J,respectively.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第12期1726-1730,共5页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金重点资助项目(50834010)
关键词
容器钢
直接淬火
回火
析出物
vessel steel
direct quenching
tempering
precipitates
