ZG25CrNiMo钢组织遗传及预先热处理对调质后力学性能的影响  

Effect of microstructure heredity and pre-heat treatment on mechanical properties of quenched and tempered ZG25CrNiMo steel

作　　者：鲍玉龙 于香华 尹卓君 Bao Yuong;Yu Xianghua;Yin Zhuojun(Qiqihar Yingge Machinery Co.,Ltd.,Qiqihar Heilongjiang 161005,China)

机构地区：[1]齐齐哈尔英格机械有限公司,黑龙江齐齐哈尔161005

出　　处：《金属热处理》2023年第12期140-143,共4页Heat Treatment of Metals

摘　　要：研究了不同预处理工艺对调质处理前后ZG25CrNiMo钢组织和力学性能的影响。结果表明,ZG25CrNiMo铸钢具有粗晶组织遗传特性。单一的890℃×2 h正火预处理对组织遗传改善能力有限,通过950℃×2 h高温正火+890℃×2 h正火预处理则可以消除组织遗传特性、细化奥氏体晶粒。在两次正火基础上进行一次670℃×6 h退火处理,能细化晶粒,使钢消除残余内应力;再经调质处理后,ZG25CrNiMo钢抗拉强度达到800 MPa以上,-45℃低温冲击吸收能量达到50 J以上。Effect of different pre-treatments on microstructure and properties of ZG25CrNiMo steel was studied before and after quenching and tempering.The results show that the ZG25CrNiMo cast steel has coarse-grained structure heredity characteristics.A simple 890℃×2 h+normalizing pre-treatment has limited ability to improve the microstructure heredity.Through 950℃×2 h high temperature normalizing+890℃×2 h normalizing pre-treatment,the structural heredity characteristics can be eliminated and the austenite grains can be refined.On this double normalizing basis,another 670℃×6 h annealing treatment is carried out to refine the grains and also eliminate the residual internal stress.After further treatment of quenching and tempering,the tensile strength of the ZG25CrNiMo steel reaches more than 800 MPa,and the low temperature impact absorbed energy at-45℃reaches more than 50 J.

关 键 词：铸钢ZG25CrNiMo 组织遗传性 高温正火 退火 调质 

分 类 号：TG142.12[一般工业技术—材料科学与工程]