淬火温度对Fe基合金/B_(4)C电子束重熔复合涂层组织和性能的影响  

Effect of Quenching Temperature on Microstructure and Properties of Fe-Based Alloy/B_(4)C Electron Beam Remelting Composite Coating

作　　者：骆宗安[1] 周宏宇 王宇豪 张潜 余焕 LUO Zongan;ZHOU Hongyu;WANG Yuhao;ZHANG Qian;YU Huan(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110819

出　　处：《航空制造技术》2023年第20期73-79,92,共8页Aeronautical Manufacturing Technology

基　　金：山东省重点研发计划(2020CXGC010304);国家重点研发计划(2018YFA0707300)。

摘　　要：电子束重熔制备Fe基合金/B_(4)C复合涂层存在残余应力、硬质相分布不均匀和脆性大等缺点,为进一步改善复合涂层的综合性能,研究了不同淬火温度+低温回火热处理工艺对涂层组织、硬度和耐磨性的影响。结果表明,在950/1000/1050/1100℃淬火+200℃回火后,硬质相形态由平行排列的长条片层状M2B相裂解转变为圆润的棒状组织,周围缠结的网状M23(C,B)_(6)相解离球化为颗粒组织。XRD分析表明,热处理工艺有效减少了重熔复合涂层的残余应力,物相类型保持不变。热处理后涂层的平均显微硬度随淬火温度的升高先增加后减小,1050℃淬火+200℃回火时硬度达最高值970.9HV_(0.1)。1050℃淬火+200℃回火时磨损失重达最小值0.10961 g,相比未热处理复合涂层的磨损失重降低18.7%。涂层表面磨损形貌为犁沟、白点和条状磨痕,磨损机制主要为磨粒磨损。The Fe-based alloy/B_(4)C composite coating prepared by electron beam recladding has the disadvantages of residual stress,uneven distribution of hard phase and high brittleness.In order to further improve the comprehensive properties of the composite coating,the effects of different quenching temperatures and low temperature tempering on the microstructure,hardness and wear resistance of the coating were studied.The results show that the morphology of the hard phases change from the parallel lamellar M2B phase to the rounded rod-like structure,and the surrounding entangled network M23(C,B)_(6)phase is dissociated and spheroidized into a granular structure after quenching at 950/1000/1050/1100℃and tempering at 200℃.XRD analysis show that the residual stress of the recladding composite coating is effectively eliminated after heat treatment process,and the category of the phases remained unchanged.After heat treatment,the average microhardness of the coating shows a trend from increase to decrease with the increase of quenching temperature,and the hardness reaches the highest value of 970.9HV_(0.1)when quenched at 1050℃and tempered at 200℃.The wear weight loss of the composite coating quenched at 1050℃and tempered at 200℃reaches a minimum value of 0.10961 g,which is 18.7%lower than that of the composite coating without heat treatment.The wear morphology of the coating surface shows furrows,white spots and strip wear marks,and the wear mechanism is mainly abrasive wear.

关 键 词：电子束重熔 复合涂层 热处理 硬度 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG156.3[金属学及工艺—金属学]