高频感应熔覆Ni60合金组织及耐磨性能研究  

Microstructure and Wear Resistance of Ni60 Layer Prepared by High-Frequency Induction Cladding

作　　者：高原[1] 王成磊[1] 黄家强[1] 黄学锋[1] 

机构地区：[1]桂林电子科技大学,广西桂林541004

出　　处：《稀有金属材料与工程》2011年第S2期309-312,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50764002);信息材料广西重点实验室主任研究课题(桂科能0710908-06-Z);广西区自然科学基金重点项目(2010GXNSFD013008)

摘　　要：为了提高钢铁材料表面的硬度和耐磨性,采用高频感应加热熔覆方法在45钢基体上制备具有冶金结合的Ni60合金熔覆层。采用金相显微镜、扫描电镜、X射线衍射仪等研究熔覆层的组织结构,用显微硬度计测试熔覆层的显微硬度分布,并对熔覆+淬火+回火处理试样、45钢淬火+回火处理试样和未处理的45钢试样进行耐磨性测试。结果表明:熔覆层组织致密,与基体呈冶金结合,熔覆层的组织主要是在Ni的固溶体上弥散分布着Cr的碳化物、硼化物等硬质相;熔覆层具有较高的硬度,表面硬度(HV0.1)达到了13000MPa,且由表层向基体,硬度呈递减梯度分布;在相同磨损条件下,熔覆+淬火+回火试样相对磨损速度最小,耐磨性较45钢淬火+回火试样提高6.7倍,较未处理的45钢试样提高22.9倍。熔覆层的磨损机制以磨粒磨损和一些脱落硬质相碎片的磨粒磨损为主。To improve the hardness and wear resistance of steel, a Ni60 alloy cladding layer metallurgically bonded to the substrate was prepared on the surface of 45 steel by high-frequency induction cladding. The microstructure of the cladding layer was investigated by metalloscope, SEM and XRD, and the microhardness distribution of the coating was tested by microhardness tester. The wear resistance tests for quenched + tempered cladding layer, quenched + tempered 45 steel and untreated 45 steel were carried out under the same condition. The results show that the induction cladding layer is metallurgically bonded to the substrate, and the microstructure is uniform. The cladding layer in the organization is mainly dispersed distribution of hard phase such as chromium carbide and boride in Ni solid solution. The cladding layer surface has the highest hardness (HV0.1) of 13000 MPa, and hardness gradient decreases from the surface to the matrix. Under the same condition, quenched + tempered cladding layer has the least relative wear rate. Its wear resistance is 6.7 times higher than that of quenched + tempered 45 steel, 22.9 times higher than that of untreated 45 steel. The wear mechanism of cladding layer exhibits mainly abrasive wear and abrasive wear of fall-off horniness phase fragments.

关 键 词：高频感应熔覆 Ni60合金熔覆层 耐磨性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]