摘要
为研究WC粉末的添加量对40Cr钢表面激光熔覆WC+Fe基复合涂层的组织、硬度和耐磨性的影响。在40Cr钢表面制备WC的质量分数为0、5%、10%、15%的Fe基复合合金熔覆涂层。用X射线衍射仪(XRD)对熔覆层的物相进行分析;用电子扫描显微镜(SEM)和自带的能谱仪(EDS)观察复合涂层的显微组织;用维氏硬度计分析复合涂层的显微硬度;用摩擦磨损试验机测试熔覆层的耐磨损性能。结果表明:当WC粉末质量分数为0时,熔覆层的物相主要由α-Fe、Fe_(3)C组成;而添加WC粉末后,熔覆层中出现了Fe_(3)W_(3)C、Fe_(2)W_(2)C等新的硬质相,弥散分布在熔覆层中,可达到提高熔覆层硬度和耐磨损的目的。熔覆层显微组织无气孔、裂纹及其他较明显的组织缺陷。当WC粉末的质量分数为15%时,熔覆层的显微硬度为1 015.73HV_(0.2),约为基体硬度的3.7倍,此时熔覆层硬度为整组试样中最高。相较于WC粉末的质量分数为0时的合金涂层,添加质量分数为5%、10%、15%WC颗粒的Fe基合金复合涂层的磨损失质量分别下降约33.3%、47.9%、60.4%,熔覆层的磨损失质量随着WC含量增加而减少,WC的质量分数为15%时磨损失质量最小,为0.19 mg。当WC颗粒的质量分数为15%时平均摩擦因数最小,为0.405 7。此时熔覆层摩擦因数和磨损失质量均最小,熔覆层耐磨性能最好,磨损形式以磨粒磨损为主。因此,添加适量WC粉末的熔覆层硬度和耐磨损性能明显提高。
The effects of WC powder addition on the microstructure,hardness and wear resistance of laser cladding WC+Fe composite coating on 40Cr steel surface were studied.The cladding coatings of 40Cr steel with WC mass fraction of 0,5%,10%and 15%were prepared.The phase of the cladding layer was analyzed by X⁃ray diffractometer(XRD).The microstructure of the composite coating was observed by electron scanning microscope(SEM)and energy dispersive spectrometer(EDS).The microhardness of composite coating was analyzed by Vickers hardness tester.The wear resistance of cladding layer was tested by friction and wear testing machine.The results show that when the amount of WC powder is 0,the cladding phase is mainly composed ofα⁃Fe and Fe_(3)C.After the addition of WC powder,new hard phases such as Fe_(3)W_(3)C and Fe_(2)W_(2)C appear in the cladding layer,which are dispersed in the cladding layer,which can achieve the purpose of improving the hardness and wear resistance of the cladding layer.There are no pores,cracks and other obvious defects in the microstructure of cladding layer.When the mass fraction of WC powder is 15%,the microhardness of the cladding layer was 1015.73HV_(0.2),which is about 3.7 times of the matrix hardness,and the hardness of the cladding layer is the highest in the whole group of samples.Compared with the alloy coating with WC powder mass fraction of 0,the wear loss mass of Fe⁃base alloy composite coating with 5%,10%and 15%WC particles decrease by about 33.3%,47.9%and 60.4%,respectively.The wear loss mass of cladding layer decreases with the increase of WC content.When WC mass fraction is 15%,the grinding loss is the smallest,which was 0.19 mg.When the mass fraction of WC particles is 15%,the average friction coefficient is the smallest,which is 0.4057.At this time,the friction coefficient and wear loss of the cladding layer are the smallest,the wear resistance of the cladding layer is the best,and the wear form is mainly abrasive wear.Therefore,the hardness and wear resistance of the cladding layer with the addition of appropriate amount of WC powder are significantly improved.
作者
雷声
张海浪
李侠
胡珊珊
王厚民
胡正强
LEI Sheng;ZHANG Hailang;LI Xia;HU Shanshan;WANG Houmin;HU Zhengqiang(School of Mechanical and Electrical Engineering,Anhui Jianzhu University,Hefei 230601,China;Hefei Vocational College of Finance and Economics,Hefei 230601,China)
出处
《兵器材料科学与工程》
2025年第2期45-53,共9页
Ordnance Material Science and Engineering
基金
安徽省教育厅自然科学重点资助项目(2023AH050198,2022AH050250)
2022年度安徽省住房城乡建设科学技术计划项目(2022-YF068)
安徽建筑大学科研项目(JY2021-C-039)
中共安徽省委教育工委2022年度高校优秀拔尖人才培育项目(gxyq2022295)。
