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卞宏友,翟星玥,王世杰,李英,王伟,王维.热输入及热循环对激光沉积修复DZ125裂纹和组织的影响[J].稀有金属材料与工程(英文),2020,49(5):1701~1706.[bianhongyou,zhaixingyue,wangshijie,liying,wangwei and wangwei.Influence of Heat Input and Thermal Cycling on the Crack and Microstructure of Laser Deposition Repair DZ125 Alloy[J].Rare Metal Materials and Engineering,2020,49(5):1701~1706.]
Influence of Heat Input and Thermal Cycling on the Crack and Microstructure of Laser Deposition Repair DZ125 Alloy
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Received:February 26, 2019  Revised:March 31, 2019
Key words: laser deposition repair  process parameters  liquefied crack  solidification crack  microstructure
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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bianhongyou,zhaixingyue,wangshijie,liying,wangwei and wangwei  
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      The effects of different heat input and multi-layer thermal cycle on the crack morphology, distribution, expansion mode and microstructure and hardness of the deposition zone were analyzed by laser deposition of DZ125 single-layer multilayer experiments. The results show that as the heat input increases, the number of low-melting eutectic increases, and the formed liquefaction cracks expand along the crystal and increase in size. Optimizing the process parameters and reducing the heat input can prevent from producing the cracks; as the number of sedimentary layers increases, the heat accumulation increases, the cooling rate decreases, the thermal stress increases, and the solidification crack expands in both the horizontal and longitudinal direction. The interlayer heat is reduced by interlayer cooling to obtain a single-channel multilayer crack-free structure. In the first layer of the deposition zone, the carbides gradually become round and the number decreases, and the hardness of the first layer decreases slowly.