摘要
为了解决热磨片服役过程中出现的磨损失效问题,对高碳热磨片在淬火回火过程中的显微组织变化及耐磨性进行了研究。以高铬高碳铸铁为研究对象,利用金相显微镜、X射线衍射仪、硬度计、磨损试验机等对经过热处理后的样品进行组织观察和性能测试。实验结果表明:样品原始组织由初生(Cr,Fe)7C 3、共晶(Cr,Fe)7C 3、马氏体及奥氏体组成;低温回火时,碳化物变化不明显,基体为回火马氏体+奥氏体;随着回火温度的升高,碳化物逐渐增加,回火马氏体逐渐减少;当温度超过450℃时,回火马氏体消失,基体组织转变为铁素体+奥氏体;硬度随回火温度的升高呈现先略微减小、然后增大再减小的趋势,在450℃时硬度最高,为63.4HRC;与铸态相比,均匀分布的碳化物耐磨性提高了2.53倍。研究淬火回火工艺对高碳热磨片显微组织及耐磨性的影响,为提高高碳热磨片的耐磨性、延长其使用寿命提供了理论依据。
In order to solve the problem of wear failure during the service of the hot grinding discs,the microstructure changes and wear resistance of high-carbon hot grinding discs during quenching and tempering were investigated.Taking high chromium high carbon cast iron as the research object,the microstructure and performance of the heat-treated specimen were studied by means of metallographic microscope,X-ray diffraction,hardness tester and wear tester.The results show that the original microstructure consists of primary(Cr,Fe)7C 3,eutectic(Cr,Fe)7C 3,martensite and austenite.When tempering at a lower temperature,the carbides are not obviously changed and the matrix is tempered martensite and austenite;with the increase of temperature,the carbides gradually increases and the tempered martensite gradually decreases;the tempered martensite disappears and the matrix microstructure changes to ferrite and austenite over 450℃.The hardness first decreases slightly,then increases and finally decreases,and the maximum value is 63.4HRC at 450℃.The wear resistance of uniformly distributed carbides is increased by 2.53 times.The results of the effect of quenching and tempering process on the microstructure and wear resistance of high-carbon hot grinding disc provide a theoretical basis for improving the wear resistance and service life of high-carbon hot grinding disc.
作者
王松
张卫红
周啸颖
王建刚
WANG Song;ZHANG Weihong;ZHOU Xiaoying;WANG Jiangang(School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China;Hebei Key Laboratory of Material Near-Net Forming Technology,Shijiazhuang,Hebei 050018,China;Hebei Qianjin Machinery Factory,Shijiazhuang,Hebei 050035,China)
出处
《河北科技大学学报》
CAS
2020年第6期537-543,共7页
Journal of Hebei University of Science and Technology
基金
河北省高等学校科学技术研究项目(ZD2020189)。
关键词
黑色金属及其合金
高铬铸铁
热处理
组织转变
碳化物
磨损性能
ferrous metal and its alloy
high-chromium cast iron
heat treatment
microstructure change
carbide
wear performance
