Evolution behavior of phase and performance in Ni-based coating layer based on high temperature thermal field  

作　　者：Qin Jian Huang Junlan Long Weimin Yu Deqing Wu Mingfang Wang Yuchang 秦建;黄俊兰;龙伟民;于德庆;吴铭方;王裕昌(State Key Laboratory of Advanced Brazing Filler Metals&Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd,Zhengzhou 450001,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Bohai Shipbuilding Heavy Industry Co.,Ltd,Huludao 125000,China;School of Materials Science and Engineering,Jiangsu university of science and technology,Zhenjiang 212000,China;Henan huanghe whirlwind Co.,Ltd,Changge 461500,China)

机构地区：[1]State Key Laboratory of Advanced Brazing Filler Metals&Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd,Zhengzhou 450001,China [2]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [3]Bohai Shipbuilding Heavy Industry Co.,Ltd,Huludao 125000,China [4]School of Materials Science and Engineering,Jiangsu university of science and technology,Zhenjiang 212000,China [5]Henan huanghe whirlwind Co.,Ltd,Changge 461500,China

出　　处：《China Welding》2020年第4期25-32,共8页中国焊接（英文版）

基　　金：Zhongyuan Leading Talents of Science and Technology Innovation(ZYQR20180030);Zhengzhou major Science and Technology Innovation Project(2019CXZX0065);Major Science and Technology Projects of Henan Province(191110210100)。

摘　　要：Effect of post-welding heat treatment on the microstructure and properties of BNi-2 brazing coating was analyzed. The phase transformation in the heat treatment process was analyzed by high temperature metallographic microscope, scanning electron microscope and X-ray diffraction, and the microhardness after the post heat treatment was tested by microhardness tester. The results show that the microstructure of brazing BNi-2 brazing coating is mainly CrB phase, Ni solid solution phase and eutectic phase of Ni_(3)B and Ni_(3)Si. After brazing,the overall hardness value is higher, generally higher than 510 HV, and the microhardness in some areas is higher than 700 HV. After quenching, the solid solution phase of Ni increased, and the eutectic phase of Ni and Ni_(3)Si decreased, leading to the softening of the brazing coating, the area whose microhardness in the range of 342 HV–454 HV increased. After tempering the brazed coating samples, the eutectic phases of Ni and Ni_(3)Si grew and the hardness recovered, but the overall hardness distribution was still lower than the brazing one. The results of the brazing post-heat treatment test show that the post-welding heat treatment will bring adverse effects on the hardness distribution of the coating, which may affect the wear resistance of the coating.

关 键 词：brazing coating BNI-2 post welding heat treatment Micro-hardness 

分 类 号：TG454[金属学及工艺—焊接]