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卞宏友,邸腾达,王世杰,李英,王伟,杨光.激光沉积修复DZ125组织与摩擦磨损性能[J].稀有金属材料与工程(英文),2020,49(6):2039~2045.[Bian Hongyou,Di Tengda,Wang Shijie,Li Ying,Wang Wei and Yang Guang.Microstructure and wear Properties of Laser Deposition Repaired DZ125 Alloy[J].Rare Metal Materials and Engineering,2020,49(6):2039~2045.]
Microstructure and wear Properties of Laser Deposition Repaired DZ125 Alloy
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Received:April 07, 2019  Revised:May 28, 2019
Key words: DZ125 superalloy  laser deposition repair  microscopic structure  friction and wear
Foundation item:辽宁省自然科学基金(20170540690)国家重点研发计划资助(2017YFB1104002)
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Bian Hongyou,Di Tengda,Wang Shijie,Li Ying,Wang Wei and Yang Guang  
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      A laser deposition repair experiments were carried out on DZ125 casting substrate. The microstructure, hardness and friction and wear properties of laser deposition were studied. The results show that the morphology of the deposition area from bottom to top is as follows:Planar crystals with a width of about 8μm and columnar crystals with close arrangement along the deposition direction are grown. The dendrites in the middle of the sedimentary zone and the chaotic equiaxed crystals at the top. The size of γ "phase at the boundary of the deposit zone is larger than that of the layer, and the size of the γ" phase at the grain boundary is larger than that of the crystal, the phenomenon of the distribution of the eutectic and the mc carbides along the grain boundary is obvious, Different morphologies of MC carbides were found in the deposited area.Most of the MC carbides in the middle and lower parts of the deposit area are short rod-like MC carbides, and the top of the deposit areas are mostly small blocks and octahedral MC carbides.The microhardness of the deposited area is about 455~475 HV0.3, which is higher than that of the substrate 410~420HV0.3.The wear resistance of the deposition area is superior to that of the matrix, and the wear mechanism is mainly abrasive wear .