Study of WC Microalloying Behavior and Tribological Property of Homogeneous Laser Cladding Layer on H13 steel
CHANG Gengrong1, LIU Mingxia1, MENG Yu1, GUO Yan2, Ma Dayan3, LI Shiliang4, XU Kewei1,3,*
1 Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, Xi’an University, Shaanxi, Xi’an 710065, China 2 Huadian Electric Power Research Institute Co., Ltd., Hangzhou 710000, China 3 State-Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China 4 Shaanxi Tianyuan Intelligent Remanufacturing Co., Ltd., Xi’an 710018, China
Abstract: The homogeneous laser cladding layers with different tungsten carbide (WC) contents were fabricated on the H13 steel, and the microstructure characteristics and tribological properties were studied. The microstructure and the law of phase evolution were investigated by X-ray diffractometer, scanning electron microscope. The tribological property and hardness characteristics of laser cladding layers were analyzed by tribometer, laser scanning confocal microscope and microhardness tester. The effects of various WC contents on the microstructure and tribological properties of different cladding layers was investigated, and the correlation between microstructure and tribological properties was clarified. Results indicated that the homogeneous laser cladding layer achieved excellent metallurgical combination with the matrix, and the outer contour of WC particles reacted with the homogeneous powder to produce micro-alloyed reinforcement. Besides, the phase of cladding layers was transformed from primary ferrite to austenite, and formed new hard phases with network dispersed at grain boundaries, which can refine grains as well as strengthen grain-boundary. The hard phases induce “cobblestone” effect and obtain a high hardness of 1 104HV, friction coefficient lower than 0.51, the specific wear rate lower than 2.24×10-8 mm3/(N·m). Overall, the wear resistance was 17.62 times higher than that of the matrix, which effectively improves the wear resistance of H13 steel surface.
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2023, Vol. 37 
