Study of Cracking Mechanism and Wear Resistance in Laser Cladding Coating of Ni-based Alloy  

作　　者：Zhenglei Yu Lunxiang Li Deqiang Zhang Guangfeng Shi Guang Yang Zezhou Xu Zhihui Zhang 

机构地区：[1]Key Lab of Bionic Engineering,Ministry of Education,Jilin University,Changchun 130022,China [2]State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China [3]College of Mechanical and Electric Engineering,Changchun University of Science and Technology,Changchun 130022,China [4]College of Mechanical Engineering and Automation,Liaoning University of Technology,Jinzhou 121001,China [5]Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Shenyang 110136,China

出　　处：《Chinese Journal of Mechanical Engineering》2021年第5期259-272,共14页中国机械工程学报（英文版）

基　　金：Supported by National Key R&D Program of China(Grant No.2018YFB1105100);National Natural Science Foundation of China(Grant No.51975246);Jilin Provincial Science and Technology Development Plan of China(Grant Nos.20190302123GX,YDZJ202101ZYTS134);the State Key Laboratory of Automotive Simulation and Control-ziyoutansuoxiangmu(202013);Interdisciplinary Research Funding Program for Doctoral Candidates of Jilin University(101832020DJX052);Science and Technology Project of Jilin Education Department(Grant No.JJKH20200958KJ);Program for JLU Science and Technology Innovative Research Team(Grant No.2019TD-34);the Advanced Manufacturing Project of Provincial School Construction of Jilin Province of China(Grant No.SXGJSF2017-2).

摘　　要：Nickel-based alloy coatings were widely used for the remanufacturing of dies and moulds by laser cladding,but the crack sensitivity would be increase due to the higher strength and hardness,which reduced the wear resistance of Ni-based alloys.In this paper,Ni-based coatings with the addition of a plastic phase(an austenitic stainless net)were prepared using laser cladding technology,and the CeO_(2)was added in cladding layers.The cracking mechanism,microhardness,microstructure,phase composition,and wear properties were investigated.The relationship between thermal stress and the elastic and plastic fracture had been developed from the standpoint of fracture mechan-ics and thermal elastic fracture mechanics.The fracture criterion of the nickel-based coating was obtained,and the study has shown that the crack sensitivity could be reduced by decreasing the thermal expansion coefficientΔα.Thus,a new method was proposed,which the stainless steel nets were prefabricated on the substrate.It was found that the number of cracks reduced significantly with the addition of stainless steel net.When the stainless steel net with 14 mesh was added in Ni-based coatings,the average microhardness of nickel composite coating was 565 HV_(0.2),which was 2.6 times higher than that of the 45 steel substrate.Although the rare earth oxide 4 wt.%CeO_(2)and stainless steel net were added in the Ni-based coating reducing the microhardness(the average microhardness is 425 HV_(0.2)),the wear resistance of it improved substantially.The wear volume of Ni-based composite coating was 0.56×10^(−5) mm^(3)·N^(−1)·m^(−1),which was 85.1%lower than that of 45 steel.The experiment results have shown that the Nickel-based composite coating is equipped with low crack sensitivity and high abrasive resistance with austenitic stainless net and the rare earth oxide 4 wt.%CeO2.This research offers an efficient solution to produce components with low crack susceptibility and high wear-resistance coatings fabricated by laser cladding.

关 键 词：Laser cladding Wear resistance Crack sensitivity Stainless steel net Rare earth oxide 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG665[金属学及工艺—金属学]