稀土对23CrNiMoA钢显微组织和冲击性能的影响  

Effect of Rare Earth on Microstructure and Impact Property of 23CrNiMoA Steel

作　　者：高洁 罗迪强[1] 付瑜 谢科桂 付春平 赖朝彬[1] GAO Jie;LUO Diqiang;FU Yu;XIE Kegui;FU Chunping;LAI Chaobin(Department of Material Metallurgical Chemistry,Jiangxi University of Technology,Ganzhou 341000,China;Xinyu Weiao Forging Co.,Ltd.,Xinyu 338013,China)

机构地区：[1]江西理工大学材料冶金化学学部,江西赣州341000 [2]新余威奥锻造有限公司,江西新余338013

出　　处：《热加工工艺》2024年第13期94-98,104,共6页Hot Working Technology

基　　金：国家自然科学基金项目(52174316,51974139);江西省重大科技研发专项项目(20194ABC28011)。

摘　　要：采用金相显微镜、冲击试验机、扫描电镜和能谱仪等设备,研究稀土对23CrNiMoA钢的组织和冲击性能的影响。结果表明,在23CrNiMoA中添加质量分数为0.018%的镧铈金属后,钢材金相组织并无明显变化;在室温(20℃)试验钢纵向和横向冲击吸收能量分别由86.0 J和70.3 J提升至93.7 J和85.7 J,等向性提高了11%,冲击性能得到显著提升。此外,通过观察试验钢的冲击断口形貌可以看出,添加稀土后钢中断口处韧窝数量增多,且分布均匀,同时这些大而深的韧窝底部存在1μm左右的球状稀土夹杂物,这使得冲击断裂时裂纹扩展所需的吸收能量大大提高,对23CrNiMoA钢冲击性能起到良好的改善作用。The effects of rare earth on the microstructure and impact property of 23CrNiMoA steel were studied by metallographic microscope,impact tester,scanning electron microscope and energy spectrum.The results show that the metallographic structure of 23CrNiMoA steel has no obvious change after adding 0.018wt%lanthanum cerium metal.At room temperature(20℃),the longitudinal and transverse impact absorbed energy of the test steel increase from 86.0 J and 70.3 J to 93.7 J and 85.7 J,respectively,the isotropy increases by 11%,and the impact properties are significantly improved.In addition,by observing the impact fracture morphology of the test steel,it can be seen that after the addition of rare earth,the number of dimples at the fracture of the steel increases and the distribution is uniform.At the same time,there is spherical RE inclusions of about 1μm at the bottom of these large and deep dimples,which greatly improves the absorbed energy required for crack propagation during impact fracture,and plays a good role in improving the impact property of 23CrNiMoA steel.

关 键 词：23CrNiMoA钢 稀土 显微组织 冲击性能 

分 类 号：TG260[金属学及工艺—铸造] TG142.45[一般工业技术—材料科学与工程]