摘要
通过在FeCrNiMo粉末中添加La和Ce混合稀土粉末对EA4T钢进行激光熔覆再制造,采用SEM、EDS、XRD等方法观察熔覆层的微观组织结构,并对再制造试样进行拉伸实验。结果表明:FeCrNiMoRE合金粉末再制造试样熔覆区主要为板条马氏体、奥氏体和碳化物组成;在熔覆区La和Ce在晶界和晶内分布较均匀,并且与O、C、S元素等形成稀土夹杂物,作为碳化物非均质形核质点,起到细化晶粒的作用;再制造试样的抗拉强度为932 MPa、屈服强度为735 MPa,分别比基体提高12.56%和9.7%;其延伸率和断面收缩率与基体基本相当,断裂特征为韧性断裂。
EA4T steel was Laser cladding remanufactured by adding La and Ce mixed rare earth powder to FeCrNiMo powder.The microstructure of the cladding layer was observed by using SEM,EDS,XRD and other methods,and the remanufactured samples were tested by tensile test.The results show that the microstructure of FeCrNiMoRE alloy powder remanufactured samples is mainly composed of lath martensite,austenite and carbide in the cladding area.In the cladding zone,La and Ce are evenly distributed in grain boundaries and crystals,and form rare earth inclusions with O,C,S,etc.,which act as heterogeneous nucleation particles of carbides and play a role in refining grains.Therefore,the tensile strength is 932 MPa and yield strength is 735 MPa of the remanufactured sample.They were improved 12.56%and 9.7%higher than that of the substrate,respectively.Generally,the elongation and reduction of section were similar to that of the matrix.
作者
陈文静
毛裕
唐思成
CHEN Wenjing;MAO Yu;TANG Sicheng(School of Materials Science and Engineering,Xihua University,Chengdu 610039 China)
出处
《西华大学学报（自然科学版）》
CAS
2020年第3期35-41,共7页
Journal of Xihua University:Natural Science Edition
基金
四川省科技厅重点项目(2014GZ0167)
四川省教育厅项目(15ZA0133)。
作者简介
第一作者:陈文静(1971-),女,高级工程师,博士,主要从事新材料焊接工艺及焊接接头质量控制以及再制造等方面的研究工作。作为主研或项目负责人先后承担省部级项目4项,各类横向科研项目10余项,发表论文30余篇,SCI收录7篇,EI收录1篇,授权发明专利2项。ORCID:0000-0001-8664-4664,E-mail:njchenwenjing@163.com。
