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,2020,49(5):1701~1706.[bianhongyou,zhaixingyue,wangshijie,liying,wangwei,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.]
热输入及热循环对激光沉积修复DZ125裂纹和组织的影响
投稿时间:2019-02-26  修订日期:2019-03-31
中文关键词:  激光沉积修复  工艺参数  液化裂纹  凝固裂纹  显微组织
基金项目:辽宁省自然科学基金(20170540690)国家重点研发计划资助(2017YFB1104002)
中文摘要:
      通过激光沉积DZ125单道多层实验,分析了不同热输入量和多层热循环对沉积试样裂纹形态、分布、扩展方式以及沉积区组织、硬度的影响规律。结果表明:随着热输入量的增大,低熔点共晶数量增多,形成的液化裂纹沿晶扩展且尺寸增大,优化工艺参数降低热输入可防止裂纹产生;随着沉积层数的增加,热累积增大,冷却速率降低,产生的热应力增大,凝固裂纹横纵向均有扩展;通过层间冷却,减小热累积,获得单道多层无裂纹组织;在单道多层沉积试样中,沉积区第一层碳化物由条状逐渐变圆形,数量减少,第一层的硬度呈缓慢降低趋势。
Influence of Heat Input and Thermal Cycling on the Crack and Microstructure of Laser Deposition Repair DZ125 Alloy
英文关键词:laser deposition repair  process parameters  liquefied crack  solidification crack  microstructure
英文摘要:
      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.
作者单位E-mail
卞宏友 沈阳航空航天大学航空制造工艺数字化国防重点学科实验室 bianhongyou@sau.edu.cn 
翟星玥 沈阳航空航天大学航空制造工艺数字化国防重点学科实验室  
王世杰 沈阳工业大学机械工程学院  
李英 中国航发沈阳黎明航空发动机有限责任公司焊接技术室  
王伟 沈阳航空航天大学航空制造工艺数字化国防重点学科实验室  
王维 沈阳航空航天大学航空制造工艺数字化国防重点学科实验室  
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