Ni_(3)Al基合金激光熔覆组织特征与耐磨性能  

Microstructure and wear resistance in laser cladding of Ni_(3)Al based alloy

作　　者：屈岳波 刘振波 韩伟[1] 赵琳[1] 李长海[2] 田志凌[1] QU Yuebo;LIU Zhenbo;HAN Wei;ZHAO Lin;LI Changhai;TIAN Zhiling(Central Iron and Steel Research Institute,Beijing 100081,China;Chalmers University of Technology,GoteborgSE-41296,Sweden)

机构地区：[1]钢铁研究总院有限公司,北京100081 [2]查尔姆斯理工大学,哥德堡SE-41296

出　　处：《粉末冶金工业》2022年第5期68-73,共6页Powder Metallurgy Industry

基　　金：国家重点研发计划资助项目(2020YFE0200900)。

摘　　要：利用Ni_(3)Al/25%Cr_(3)C_(2)混合粉末和激光熔覆技术,在45钢表面制备了Ni_(3)Al基合金熔覆层,研究了熔覆层组织特征与耐磨性能。结果表明,Ni_(3)Al基合金熔覆层组织主要为Ni_(3)Al、NiAl和原位自生M_(7)C_(3)型碳化物。熔覆层显微硬度为599.6 HV_(0.1),约为45钢基板平均显微硬度的2.73倍。由于细小M_(7)C_(3)弥散分布于熔覆层中,Ni_(3)Al基合金熔覆层具有良好的磨损性能。熔覆层磨损机制为磨粒磨损,摩擦因数约为0.55,磨损率为1.12×10^(-5)mm^(3)/N·m,约为蠕墨铸铁磨损率的28.6%。Laser cladding was carried out to prepare Ni_(3)Al based alloy coatings on 45 steel by using Ni_(3)Al/25%Cr_(3)C_(2)mixed powder.Microstructure and wear resistance of the cladding materials was investigated.The results indicate that the microstructure of the Ni_(3)Al based cladding materials contains mainly Ni_(3)Al,Ni_(3)Al,and in situ-formed Cr_(7)C_(3).The hardness of the cladding materials is 599.6HV_(0.1),about 2.73 times of that of 45 steel.Ni_(3)Al based cladding materials show sound wear resistance,owing to homogeneous distribution of fine Cr_(7)C_(3).The wear mechanism of the cladding materials is abrasive wear,and its friction coefficient is about 0.55.The specific wear rate of the cladding materials is 1.12×10^(-5)mm^(3)/N·m,only 28.6% of that of the vermicular graphite cast iron.

关 键 词：Ni_(3)Al基合金 激光熔覆 显微组织 磨损性能 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程] TG174.4[金属学及工艺—金属表面处理] TG665[金属学及工艺—金属学]