旋耕刀感应钎涂层热处理工艺研究  

Heat Treatment Process of Induction Braze Coating of Rotary Blades

作　　者：龙伟民 秦建 路全彬 刘大双 吴爱萍[1] LONG Weimin;QIN Jian;LU Quanbin;LIU Dashuang;WU Aiping(Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China;Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou 450001,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]清华大学机械工程系,北京100084 [2]郑州机械研究所有限公司,郑州450001 [3]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《材料导报》2022年第7期92-96,共5页Materials Reports

基　　金：国家自然科学基金(U2004186);河南省重大关键技术需求揭榜攻关项目(191110111000);宁波市“3315”人才计划2020年创新团队C类。

摘　　要：金刚石感应钎涂过程对钢基体组织和性能有较大影响,钎涂后热处理是提高基体性能的重要手段,但对涂层也有较大影响。采用高温金相显微镜、SEM、XRD、硬度试验等分析测试手段,研究了钎涂后热处理工艺对感应钎涂镍基合金组织演变及硬度的影响规律。结果表明,钎涂后的NiCrSiB钎涂层组织主要由Ni固溶体、CrB、Ni_(3)Si、Ni_(3)B和Ni-Ni_(3)Si共晶组成;淬火处理后,Ni_(3)Si-Ni固溶体共晶数量减少,尺寸减小,CrB出现一定程度的长大,且整体Ni_(3)Si含量降低;回火处理后,NiCrSiB钎涂层组织晶界附近共晶数量又增多,CrB进一步长大,促进少量的Ni_(3)Si组织生成。在钎涂状态下涂层硬度较高,经淬火后显微硬度整体下降,再经回火处理后显微硬度有所回升。以农机装备用旋耕刀为具体对象,研发了钎涂联合热处理提升旋耕刀整体性能的新技术。The process of diamond induction brazing has a great influence on the microstructure and property of the steel substrate.Post brazing heat treatment is an important method to improve the performance of the substrate,but it also has great impact on the coating.The influence of post heat treatment on the hardness and microstructure evolution of induction brazing nickel base alloy coating was investigated by means of high temperature microscope,SEM,XRD,hardness testing and other analytical methods.The results show that the NiCrSiB brazing coating structure was mainly composed of Ni solid solution,CrB,Ni_(3)Si,Ni_(3)B,and Ni-Ni_(3)Si eutectic phases.After quenching treatment,the content and dimension of Ni_(3)Si-Ni solid solution eutectic crystals decreased,the CrB phase grew to a certain extent,and the total content of Ni_(3)Si phase reduced.After tempering treatment,the content of the eutectic structure near the grain boundary of the NiCrSiB brazing coating increased,and CrB phase grew further to promote the formation of little Ni_(3)Si phase.The hardness of the brazed state coating was higher,then it decreased integrally after quenching and rose again after tempering.A novel technology of brazing and coating combined with heat treatment to improve the comprehensive performance of the rotary cultivator was developed,based on the rotary blade for agricultural machinery equipment as the specific object.

关 键 词：金刚石 感应钎涂 高温金相 硬度分布 

分 类 号：TG425[金属学及工艺—焊接]