脉冲电流-激光复合愈合钛合金深层裂纹微观组织研究

发布时间：2018-06-05 21:01

  本文选题：脉冲电流 + 激光　； 参考：《机械工程学报》2017年20期

【摘要】：分别借鉴脉冲电流对深层裂纹愈合效果良好及激光对浅层裂纹愈合效果明显的优势,用脉冲电流及激光对钛合金中的深层裂纹进行复合处理。脉冲电流处理过程中,绕流效应使得裂尖处产生了较高的温升并形成了局部压应力。脉冲电流处理结束后,深层裂纹中出现了部分愈合区域,电子探针检测显示愈合区内元素分布均匀,电子背散射衍射检测显示愈合区内主要为细小的针状马氏体。经过脉冲电流与激光复合处理后,钛合金中深层裂纹愈合效果明显。激光重熔使得上部裂纹愈合良好并形成了重熔区-热影响区-基体的结构。在距离重熔区较近位置处,由脉冲电流形成的愈合区呈现出明显的柱状晶结构。
[Abstract]:Using the advantages of pulse current for deep crack healing and laser for shallow crack healing, the deep crack in titanium alloy was treated with pulse current and laser. In the process of pulse current treatment, the temperature rise at the crack tip is higher and the local compressive stress is formed due to the flow around the crack tip. At the end of pulse current treatment, partial healing zone appeared in the deep crack. Electron microprobe (EPMA) showed that the elements in the healing zone were uniform, and the electron backscatter diffraction (EBSD) showed that the healing zone was mainly acicular martensite. After pulse current and laser treatment, the deep crack healing effect of titanium alloy is obvious. Laser remelting makes the upper crack heal well and forms the structure of remelting zone, heat affected zone and matrix. Close to the remelting zone, the healing zone formed by pulse current shows a columnar crystal structure.
【作者单位】： 大连理工大学机械工程与材料能源学部;沈阳鼓风机集团股份有限公司研究院;大连理工大学辽宁省凝固控制与数字化制备技术重点实验室;
【基金】：国家重点基础研究发展计划(973计划,2011CB013402) 辽宁省自然科学基金(2014028002) 辽宁省科技创新重大专项(201303002) 辽宁重大装备制造协同创新中心 沈鼓-大工重大科研发展基金 中央高校基本科研业务费专项资金资助项目
【分类号】：TG146.23;TG66
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本文编号：1983388