摘要
为提高热作模具钢H13钢(4Cr5MoSiV1)的表面硬度及耐磨性,采用激光熔覆方法在H13钢表面制备Ni60A/WC复合涂层,通过SEM、EDS和XRD等方法观察分析熔覆层显微组织及物相组成,并测定熔覆层的显微硬度和摩擦磨损性能。试验结果表明:Ni60A熔覆层微观组织呈现从底部到顶部逐渐细化趋势,硬质相WC含量的增加使Ni60A/WC复合涂层中短柱状及岛状组织不断粗大。Ni60A熔覆层主要组成相包括γ-(Ni,Fe)、FeNi_(3)、Ni_(2.9)Cr_(0.7)Fe_(0.36)、Cr_(5)B_(3)和Cr_(23)C_(6)等,添加WC后熔覆层出现了Cr_(3)C_(2)、W_(2)C和WC等硬质相。随WC含量增加,熔覆层显微硬度和耐磨性均逐渐提高,Ni60A/15%(质量分数)WC硬度达到1116.2 HV_(1.96 N),平均磨损失重为9.6 mg,以磨粒磨损为主,磨损形貌中犁沟逐渐减少、变浅变窄,微观切削作用减小,耐磨性提高,Ni60A/15%WC耐磨性较好。综合分析,Ni60A/15%WC复合涂层的综合性能较好。
In order to improve the wear resistance of the hot work die steel H13 steel(4Cr5MoSiV1)surface hardness tester,this work used the laser cladding method to prepare the Ni60A/WC composite coating on the surface of the H13 steel.The microstructure and phase composition of the cladding layer were observed and analyzed by SEM,EDS and XRD,and the microhardness and wear resistance of the cladding layer were also studied.Results showed that the microstructure of the Ni60A cladding layer tended to be gradually refined from the bottom to the top.With the increase of hard phase WC,the short columnar and island-like structures in the Ni60A/WC composite coating continued to be thicker.The Ni60A cladding layer was mainly composed ofγ-(Ni,Fe),FeNi_(3),Ni_(2.9)Cr_(0.7)Fe_(0.36),Cr_(5)B_(3),and Cr_(23)C_(6),and after adding WC,the hard phases of Cr_(3)C_(2),W_(2)C and WC came out in the cladding layers.With the increase of WC additive amount,the microhardness and wear resistance of cladding layer were gradually improved.In addition,the microhardness of Ni60A-15%WC(mass fraction)was 1116.2 HV_(1.96 N),and the average wear loss was 9.6 mg,which mainly belonged to abrasive wear.In the wear morphology,the furrows gradually decreased and became shallower and narrower,demonstrating the micro-cutting effect was reduced and the wear resistance was improved,and so Ni60A/15%WC had better wear resistance.From the comprehensive analysis,it could be obtained that the overall performance of the Ni60A/15%WC composite coating was better.
作者
韩成府
许培鑫
马伟伟
孙玉福
HAN Cheng-fu;XU Pei-xin;MA Wei-wei;SUN Yu-fu(Mechanical and Electrical Engineering,Zhongyuan Institute of Technology,Zhengzhou 450000,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450000,China)
出处
《材料保护》
CAS
CSCD
2021年第12期90-96,110,共8页
Materials Protection
基金
河南省科技攻关资助项目(182102210083)。
作者简介
通信作者:孙玉福(1958-),硕士,教授,主要研究方向为铸造合金,电话:0371-63887502,E-mail:yufusunzzu@163.com。
