超高速激光金属沉积增材制造K648高温合金的显微组织与性能  

Microstructure and properties of K648 superalloy additively manufactured by extreme high-speed laser metal deposition

作　　者：王开明 刘炜 都东[2] 常保华[2] 刘冠 胡永乐[1] 仝永刚 张明军[1] 张健[1] 鞠江 Kai-ming WANG;Wei LIU;Dong DU;Bao-hua CHANG;Guan LIU;Yong-le HU;Yong-gang TONG;Ming-jun ZHANG;Jian ZHANG;Jiang JU(College of Automotive and Mechanical Engineering,Changsha University of Science and Technology,Changsha 410114,China;State Key Laboratory of Tribology in Advanced Equipment,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China;School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong 999077,China)

机构地区：[1]长沙理工大学汽车与机械工程学院,长沙410114 [2]清华大学机械工程系高端装备界面科学与技术全国重点实验室,北京100084 [3]中南大学机电工程学院,长沙410083 [4]香港城市大学材料科学与工程系,中国香港999077

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第7期2192-2203,共12页中国有色金属学报（英文版）

基　　金：the financial support for this work from the National Natural Science Foundation of China(No.52205334);the Natural Science Foundation of Hunan Province,China(No.2022JJ40495);the Changsha Key Research and Development Project,China(No.kh2201275);the Changsha Municipal Natural Science Foundation,China(No.kq2202196);the Tribology Science Fund of State Key Laboratory of Tribology in Advanced Equipment,China(No.SKLTKF21B08)。

摘　　要：采用一种新型的超高速激光金属沉积工艺以提高高铬高温合金的制造效率。分别使用透射电子显微镜、拉伸试验机、磨损试验机和电化学工作站对超高速激光金属沉积高铬K648高温合金的析出相生长行为、高温力学性能、耐磨性和耐腐蚀性进行研究,并与传统激光金属沉积工艺进行比较。结果表明,超高速激光金属沉积K648合金的析出相尺寸明显小于传统激光金属沉积工艺制备的K648合金,700℃下的高温强度更高,且具有良好的耐磨性和耐腐蚀性。总之,超高速激光金属沉积制造的K648高铬高温合金具有良好的综合性能。In order to improve the manufacturing efficiency of high-chromium superalloys,an innovative extreme highspeed laser metal deposition(EHLMD)process was used.The growth behavior of precipitated phases,high-temperature mechanical properties,wear resistance,and corrosion resistance of EHLMD K648 superalloy were investigated and compared with conventional laser metal deposition(CLMD)using transmission electron microscope,tensile tester,wear tester and electrochemical workstation,respectively.The results reveal that the precipitated phase size in EHLMD K648 superalloy is significantly smaller than that in CLMD K648 superalloy.Moreover,EHLMD K648 superalloy demonstrates higher tensile strength at 700°C,superior wear resistance,and excellent corrosion resistance compared to CLMD K648 superalloy.Consequently,the K648 superalloy manufactured through EHLMD technique exhibits favorable comprehensive properties.

关 键 词：增材制造 超高速激光金属沉积 K648高温合金 显微组织演变 性能 

分 类 号：TG132.3[一般工业技术—材料科学与工程]