回火时间对9Ni钢组织性能的影响  

Influence of Tempering Time on Microstructure and Properties of 9Ni Steel

作　　者：刘勇 

机构地区：[1]技术质量部

出　　处：《南钢科技与管理》2014年第2期4-7,共4页NISCO Technology and Management

摘　　要：通过力学性能检验和组织分析,研究了回火时间对QT工艺热处理9Ni钢组织性能的影响规律,结果表明：随着回火时间增加,屈服强度和抗拉强度降低,伸长率和-196℃的冲击功增加,回火时间大于1 h后冲击功增幅显著降低。回火过程中通过合金的迁移和富集,在晶界上形成了逆转奥氏体,利于材料的韧化。By inspecting the properties and analyzing the microstructure, the influence of tempering time on microstruc- ture and properties of QT heat-treated 9Ni steel was investigated. The results show that yield strength and tensile strength decreased, elongation and -196 ℃ impact absorb energy increased with tempering time increasing, while in- creased speed of impact energy value obviously decreased, tempering time increased to 1 h. By the diffusion and enrich- ment of alloy elements, the reversed austenite formed at grain boundaries which benefited to toughening the material.

关 键 词：9NI钢 回火时间 低温韧性 

分 类 号：TG156.5[金属学及工艺—热处理]