18Cr2Ni4WA钢奥氏体形核和长大行为研究  

Research on Nucleation and Growth Behavior of Austenite of 18Cr2Ni4WA Steel

作　　者：范子靖 郭伦 王杰 党淑娥[1] 朱雪彤 FAN Zijing;GUO Lun;WANG Jie;DANG Shu'e;ZHU Xuetong(School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Chongqing Changzheng Heavy Industry Company,Chongqing 400083,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024 [2]重庆长征重工有限责任公司,重庆400083

出　　处：《热加工工艺》2023年第16期150-153,158,共5页Hot Working Technology

基　　金：山西省研究生优秀创新项目(2020BY109)。

摘　　要：在齿轮热加工过程中,发现有晶粒粗大不均匀即混晶现象,严重影响着大型风电齿轮的综合性能以及该新型材料的推广应用。为了细化晶粒、改善大型齿轮综合力学性能,以18Cr2Ni4WA大型齿轮钢为研究对象,研究其锻后热处理过程中奥氏体晶核形成及其晶核长大行为。结果表明,该钢的形核和长大都与α相再结晶有关,在临界温度(700℃)主要是针状形核,临界温度以上(740℃)发生球状形核。随着α相再结晶完成,长大趋于等轴状,且奥氏体均匀化。In the process of gear hot machining,it is found that there is a phenomenon of coarse and uneven grain,that is,mixed grain,which seriously affects the comprehensive performance of large wind power gear and the popularization and application of the new material.In order to refine the grain and improve the comprehensive mechanical properties of large gear,the austenite nucleation and nucleation growth behavior of 18Cr2Ni4WA large gear steel during post forging heat treatment were studied.The results show that the nucleation and growth of the steel are associated withαphase.It is mainly needle nucleation at the critical temperature(700℃),and spherical nucleation occurs above the critical temperature(740℃).Asαphase recrystallization is completed,the growth tends to be equiaxed,and the austenite is homogenized.

关 键 词：18CR2NI4WA钢 奥氏体晶核形成及晶核长大 组织遗传 晶粒细化 

分 类 号：TG161[金属学及工艺—热处理]