共查询到16条相似文献,搜索用时 46 毫秒
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利用Ni3Al/25%Cr3C2混合粉末和激光熔覆技术,在45钢表面制备了Ni3Al基合金熔覆层,研究了熔覆层组织特征与耐磨性能。结果表明,Ni3Al基合金熔覆层组织主要为Ni3Al、NiAl和原位自生M7C3型碳化物。熔覆层显微硬度为599.6 HV0.1,约为45钢基板平均显微硬度的2.73倍。由于细小M7C3弥散分布于熔覆层中,Ni3Al基合金熔覆层具有良好的磨损性能。熔覆层磨损机制为磨粒磨损,摩擦因数约为0.55,磨损率为1.12×10-5mm3/N·m,约为蠕墨铸铁磨损率的28.6%。 相似文献
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为提高不锈钢材料的耐冲蚀磨损性能,以Ni46合金粉末为原料,采用等离子熔覆工艺在不锈钢1Cr18Ni9Ti基材上制备镍基合金涂层,分析了熔覆层的显微组织以及物相形貌和相结构等,测定了涂层的显微硬度.使用旋转圆盘实验机研究了Ni基等离子熔覆合金涂层在砂浆中的冲蚀行为.结果表明:材料的冲蚀磨损性能受到材料基本力学性能的限制,高硬度镍基涂层的抗冲蚀性能最好,在相同实验条件下其磨损率由小到大排列顺序为镍基涂层>0Cr13Ni5Mo>1Cr18Ni9Ti;镍合金层中奥氏体基体的固溶强化和硬质相有效抵御砂砾的冲击,是Ni基等离子熔覆合金层具有高抗冲蚀性能的主要原因. 相似文献
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镍基合金表面激光熔覆CoNiCrAlY合金的组织与性能 总被引:1,自引:0,他引:1
在镍基合金上激光熔覆CoNiCrAlY合金,制备了单层、多层试样和工件。利用金相显微镜、X射线衍射仪、显微硬度计和高温电炉,对熔覆层的组织、相结构、硬度及抗氧化性进行了测试和分析。结果表明:熔覆层的组成相有γ-Co,Ni2Y和Cr3Ni2Sic,熔覆层的氧化物为CoAl2O4,Al2O3,CoNiO2,NiCr2O4,CoCr2O4;单层熔覆层组织细小致密;由于预热的作用,搭接熔覆的组织较粗大;界面处的结晶方向垂直于界面,层问、两道之间搭接区、重熔区和多层熔覆的近表面组织有等轴化的倾向;熔覆层具有较高的硬度,加入稀土元素Y,可以增大氧化物的表面附着力、改善熔覆层的抗氧化性能;熔覆层在1100℃是抗氧化的。 相似文献
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不锈钢表面激光熔覆镍基合金层研究 总被引:2,自引:1,他引:1
采用多层多道搭接的激光熔覆方法在0Cr18Ni10Ti不锈钢表面上分别熔覆两种镍基合金涂层.1#合金涂层的硬度在HRC34左右,无开裂;2#合金涂层的硬度在HRC47左右,易开裂.采用硬度较低的1#合金涂层作为过渡层成功解决了2#合金涂层的开裂问题,成功制备出大面积较厚涂层.经光学显微镜(OM)、X射线衍射(XRD)、扫描电子显微镜(SEM)以及能谱(EDS)分析可知,大面积熔覆层的表层主要由γ-Ni枝晶、块状γ-Ni和M12C型碳化物增强相组成.显微硬度测试表明,表层平均硬度达HV0.2583,自熔覆层表层至基体,显微硬度逐渐降低. 相似文献
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高温合金表面激光熔铸镍基合金涂层的组织与耐磨性能 总被引:8,自引:0,他引:8
研究了高温合金GH33表面激光熔铸镍基合金涂层的组织和耐磨性能。结果表明,基材对涂层合金的稀释作用较小;涂层与基材之间形成良好的冶金接合;涂层基体组织为γ-Ni枝晶,枝晶间为γ-Ni、M23(CB)6、Ni3B、Cr2B、CrB、WC等;涂层耐磨性能的平均值较基材提高4倍以上。 相似文献
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LIMing-xi SISong-hua HEYi-zhu SUNGuo-xiong 《钢铁研究学报(英文版)》2004,11(4):59-62
The SiCp (20%) reinforced cobalt-based alloy composite coatings deposited by lasercladding on IF steel were introduced. The microstructure across the whole section of such coat-ings was examined using optical microscope, scanning electron microscope (SEM) and X-raydiffractometer (XRD), and the wear resistance of the coatings was measured by MM-200 typewear testing machine. The results show that the SiCp is completely dissolved during laser clad-ding and the primary phase in the coatings is r-Co. The other phases, such as SizW, CoWSi,Cr3Si and CoSi2, are formed by carbon, silicon reacting with other elements existing in themelting pool. There are various crystallization morphologies in different zones, such as planarcrystallization at the interface, followed by cellular and dendrite crystallization from interface tothe surface. The direction of solidification changes from one direction perpendicular to interfaceto multi-directions at the central and upper regions of the clad. The wear resistance of the cladis improved by adding SiCp. 相似文献
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《钢铁研究学报(英文版)》2016,(6):625-632
The microstructure and wear behavior of Fe-Cr-V-B based alloy was investigated.Each of the specimens was characterized by metallographic techniques and hardness test.Phase analysis of alloy was performed by X-ray diffraction(XRD),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The results showed that the microstructure of Fe-Cr-V-B based as-cast alloy containing 8.6mass% V was composed ofα-(Fe,Cr)solid solution,VC carbides,and V_3B_4 borides,whereas the as-cast alloy containing 24.8mass% Cr was composed ofα-(Fe,Cr)solid solution and V_3B_4borides;the eutectic V_3B_4 borides mainly comprise M2B-type borides(M presents Fe and Cr).The existence of a large amount of V atoms affects the growth pattern of eutectic borides,which mainly display rod-like and grainy structure.The wear behavior of the experimental alloy has been investigated using pin-on-disk type friction and wear apparatus.The comparison of experimental results indicated that the relative wear resistance of the alloy containing 8.6mass% V after destabilization heat treatment in a conventional furnace at 1 373 K for 2hwas about six times higher than that of the high chromium(19mass%)cast iron. 相似文献
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Effect of Laser Power on Microstructure and Wear Resistance of WCP/Ni Cermet Coating 总被引:1,自引:0,他引:1
Laser cladding nickel-based alloy coating (Ni60) and nickel-based composite coating doped with WC particles by 35 % (WCp/Ni) were produced on the low-carbon steel substrate by CO2 continuous wave laser with power of 5 kW using the injected powder technique. The effect of laser power on microstructure and wear resistance of laser cladding WCp/Ni cermet coating was investigated. The WCp/Ni alloy coating with evenly distributed WC ceramic phases and the better bond with the substrate alloy was obtained at a power of 2.2 kW. Diffusion solution reaction happened between WC particles and the substrate alloy during laser cladding, and led to the formation of block rich-tungsten carbide on the edges of the WC particles, especially at higher power. The WCp/Ni alloy coating consists of the undissolved WC particles, the block or dendritic rich-tungsten carbide, the bar-like rich-chromium carbide, and dendrite solid solution and eutectic structure among the carbides. Microhardness and wear resistance of the WCp/Ni coating at different powers were much higher or better than those of Ni60 alloy coating, and the best results were obtained at power of 2.2 kW. 相似文献