引用本文:周野飞,秦广阔,邢晓磊,陆鑫,刘长鑫.激光熔覆无碳化物贝氏体涂层制备及其摩擦学性能[J].中国表面工程,2018,31(4):160~168
ZHOU Ye-fei,QIN Guang-kuo,XING Xiao-lei,LU Xin,LIU Chang-xin.Preparation and Tribological Properties of Carbide-free Bainite Coatings by Laser Cladding[J].China Surface Engineering,2018,31(4):160~168
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激光熔覆无碳化物贝氏体涂层制备及其摩擦学性能
周野飞1,2, 秦广阔1, 邢晓磊1,2, 陆鑫1, 刘长鑫1
1.燕山大学 机械工程学院, 河北 秦皇岛 066004;2.燕山大学 亚稳材料制备技术与科学国家重点实验室, 河北 秦皇岛 066004
摘要:
通过控温激光熔覆及后续等温转变处理，制备出显微组织细小、硬度分布均匀且耐磨性良好的无碳化物贝氏体涂层。采用光学显微镜、XRD、TEM、SEM、显微硬度计、纳米压痕仪和摩擦磨损试验机等分别对不同参数的熔覆试样、对比试样的显微结构及性能进行测试。结果表明：与盐浴淬火试样相比，采用控温激光熔覆技术制备的无碳化物贝氏体涂层显微组织均匀细小，贝氏体晶格常数由2.8692 Å增加到2.8697 Å，铁素体微晶尺寸由86.3 nm减小至67.0 nm，无碳化物贝氏体涂层的显微硬度由（384±18） HV0.1提高到（430±13） HV0.1。摩擦因数由1.21降低至1.05，磨痕深度由0.1 mm降低至0.04 mm。较高的表面硬度提高了无碳化物贝氏体涂层表面抵抗塑性变形的能力，减缓了磨痕表层的剥落。
关键词:  激光熔覆  贝氏体  纳米压痕
DOI：10.11933/j.issn.1007-9289.20180129001
分类号:TG174.44;TG115
基金项目:国家自然科学基金（51705447）；河北省自然科学基金（E2015203156）
Preparation and Tribological Properties of Carbide-free Bainite Coatings by Laser Cladding
ZHOU Ye-fei1,2, QIN Guang-kuo1, XING Xiao-lei1,2, LU Xin1, LIU Chang-xin1
1.College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei;2.State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, Hebei
Abstract:
Carbide-free bainite coatings with refined microstructure, evenly distributed hardness and excellent wear resistance were prepared by temperature-controlled laser cladding technology and isothermal transformation treatment. Microstructure and properties of the cladding samples and quenched samples were analyzed by optical microscopy, XRD, TEM, SEM, a microhardness tester, nanoindentation, friction and a wear tester. Results show that, the microstructure of the carbide-free bainite coatings by temperature-controlled laser cladding is uniformed and refined compared with the quenched samples. The lattice constant of the bainite ferrite increases from 2.8692 Å to 2.8697 Å, and the crystallites size of the bainite ferrite decreases from 86.3 to 67.0 nm after temperature-controlled laser cladding. The microhardness of the bainite coatings increases from (384±18) HV0.1 to (430±13) HV0.1. Meanwhile, the wear resistance of the bainite coatings is improved, and the wear height loss is reduced from 0.1 mm to 0.04 mm related with decreasing friction coefficient from 1.21 to 1.05. The plastic deformation resistance of the coatings is also improved due to the high hardness, in turn retards the desquamation.
Key words:  laser cladding  bainite  nanoindentation
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