5NiCrMo低温钢调质热处理工艺研究  

Study on Heat Treatment Process of Quenching and Tempering for 5NiCrMo Low Temperature Steel

作　　者：楚觉非 雷晓荣[1,2] 何烈云 王青峰[2] 

机构地区：[1]南京钢铁股份有限公司技术质量部,南京210035 [2]燕山大学材料科学与工程学院,河北秦皇岛066004

出　　处：《天津冶金》2013年第2期24-27,共4页Tianjin Metallurgy

基　　金：国家863项目(2007AA03Z506)

摘　　要：研究了5NiCrMo低温钢的调质热处理工艺，分析了回火温度对该钢组织和力学性能的影响。结果表明：试验钢经调质热处理后，形成了回火马氏体和逆转变奥氏体的混合组织。560～640℃回火时，随温度提高，屈服强度呈降低趋势，-100℃冲击功先升高、在620℃回火时达到峰值后降低。深冷后保留的逆转变奥氏体显著影响试验钢的低温韧性。拉伸和冲击性能均满足要求的回火温度是580—620℃。The authors study the heat treatment process of quenching and tempering for 5NiCrMo low temperature steel and analyze the influence of tempering temperature on the steel structure and mechanical properties. Results show, after quenching and tempering treatment, a complex forms with tempered martensite as base and certain amount of reverted austenite in the tested steel. When the steel is tempered at 560-640℃, with the rise of the temperature, yield strength drops and -100 ℃ impact energy goes up at first and then down after hitting the peak value at 620℃. The retained reverted austenite after deep cooling prominently influences the low temperature toughness of the tested steel. The range of tempering temperature is 580-620 ℃ in which both the tensile and impact properties can be met.

关 键 词：低温钢 调质热处理 显微组织 力学性能 逆转变奥氏体 

分 类 号：TG156.6[金属学及工艺—热处理]