淬火工艺对大尺寸厚壁钢管组织及内应力的影响  

Effect of quenching process on microstructure and internal stress of large size thick wall steel tube

作　　者：呼陟宇 韩锦峰 孟佳红 毕向荣 孙文彬 王海燕[1] 高雪云[1] HU Zhi-yu;HAN Jin-feng;MENG Jia-hong;BI Xiang-rong;SUN Wen-bin;WANG Hai-yan;GAO Xue-yun(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China;Beijing Research Institute of Mechanical&Electrical Technology Co Ltd,CAM,Beijing 100083,China;School of Science,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]中国机械总院集团北京机电研究所有限公司,北京100083 [3]内蒙古科技大学理学院,内蒙古包头014010

出　　处：《材料热处理学报》2023年第6期167-172,共6页Transactions of Materials and Heat Treatment

基　　金：内蒙古自然科学基金(2020BS05006);内蒙古科技大学创新基金项目(2019QDL-B09)。

摘　　要：淬火工艺对大尺寸厚壁钢管淬火过程中组织和残余应力有很大影响。通过数值模拟研究了30Cr2NiMo钢管经过不同工艺淬火后的温度、组织和残余应力的分布情况。结果表明:大尺寸厚壁钢管淬火后内应力主要集中在台阶处,可达600 MPa左右,在传统淬火过程中空冷一段时间,可以在保证组织与常规油淬基本相同的前提下,降低台阶处的内应力,将内应力最大值控制在500 MPa以内,降低了钢管淬火开裂的倾向。根据模拟结果得出本试验条件下30Cr2NiMo钢管优化后的淬火工艺为:油淬420 s+空冷480 s+油淬,淬火后钢管的细管处的组织为马氏体组织,粗管处表面为马氏体+残留奥氏体组织,心部主要为马氏体+贝氏体+残留奥氏体组织。Quenching process has a great influence on microstructure and residual stress of large size thick wall steel tube.The distribution of temperature,microstructure and residual stress of the 30Cr2NiMo steel tube quenched by different processes was studied by numerical simulation.The results show that the internal stress of the large size thick wall steel tube after quenching is mainly concentrated at the step,which can reach about 600 MPa.After a period of air cooling in the conventional quenching process,the internal stress at the step can be reduced,and the maximum value of internal stress can be controlled within 500 MPa,under the premise that the microstructure is basically the same as that of conventional oil quenching,which reduces the tendency of the steel tube quenching cracking.According to the simulation results,the optimized quenching process of the 30Cr2NiMo steel tube under the experimental conditions is as follows:oil quenching 420 s+air cooling 480 s+oil quenching.After quenching,the microstructure of the fine tube in the steel tube is martensite,the surface of the coarse tube is martensite+retained austenite,and the center is mainly martensite+bainite+retained austenite.

关 键 词：30Cr2NiMo钢 大尺寸厚壁钢管 淬火工艺 数值模拟 

分 类 号：TG142.3[一般工业技术—材料科学与工程]