大厚度TC4钛合金铸件钨极惰性气体保护焊的最优工艺确定及其接头力学性能
Optimal Process Determination of Gas Tungsten Arc Welding for Large-Thickness TC4 Titanium Alloy Casting and Mechanical Properties of the Joint
摘 要
选用连续施焊、焊层冷至室温后再焊接下一层、焊道冷至室温后再焊接下一道3种层间温度控制方案和730,600℃ 2种焊后退火温度,通过显微组织、拉伸性能和疲劳性能确定了大厚度TC4钛合金铸造板钨极惰性气体保护焊(GTAW)的最优工艺,并研究了最优工艺下焊接接头的力学性能。结果表明:焊层冷至室温后再焊接下一层得到的焊接接头焊缝组织最为细小,疲劳寿命最高,在730℃下退火后的焊接接头拉伸性能更好,故确定为最优工艺;最优工艺下,GTAW接头的焊缝硬度略高于母材,属于高匹配接头,在拉伸和疲劳过程中接头均在母材处发生断裂,但焊缝的抗疲劳开裂能力低于母材。
钨极惰性气体保护焊
层间温度
焊后退火处理
疲劳
titanium alloy casting
gas tungsten arc welding
interlayer temperature
post-weld annealing treatment
fatigue
Abstract
Three interlayer temperature control schemes of continuous welding, welding next layer after welding layer was cooled to room temperature, welding next pass after welding pass was cooled to room temperature, and two annealing temperatures of 730, 600℃ were selected, and the optimal process of gas tungsten arc welding (GTAW) for large-thickness TC4 titanium alloy cast plate was determined by microstructure, tensile properties and fatigue properties. The mechanical properties of welded joint under the optimal process were studied. The results show that the welded joint by welding next layer after welding layer was cooled to room temperature had the smallest weld microstructure and the highest fatigue life, and the welded joint after annealing treatment at 730℃ had better tensile properties; so they were determined as the optimal process. Under the optimal process, the hardness of weld of the GTAW joint was slightly higher than that of base metal, and the joint was a highly matched joint. The joint fractured at base metal during both tension and fatigue processes, but the fatigue cracking resistance of the weld was lower than that of base metal.
中图分类号 TG146.2 DOI 10.11973/jxgccl202205010
所属栏目 材料性能及应用
基金项目 大科学装置科学研究联合基金项目(U2032121);国家重点研发计划项目(2016YFB1100400)
收稿日期 2020/9/22
修改稿日期 2021/10/19
网络出版日期
作者单位点击查看
备注朱丽(1984-),女,四川成都人,高级工程师,硕士通信作者:吴圣川研究员
引用该论文: ZHU Li,HU Yanan,WU Shengchuan,LI Fei,YU Wenjun,LIN Bo,LI Guangjun. Optimal Process Determination of Gas Tungsten Arc Welding for Large-Thickness TC4 Titanium Alloy Casting and Mechanical Properties of the Joint[J]. Materials for mechancial engineering, 2022, 46(5): 58～63
朱丽,胡雅楠,吴圣川,李飞,虞文军,林波,李光俊. 大厚度TC4钛合金铸件钨极惰性气体保护焊的最优工艺确定及其接头力学性能[J]. 机械工程材料, 2022, 46(5): 58～63
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【4】牟刚,华学明,徐小波,等.8 mm厚TC4钛合金TIG、MIG焊接工艺及性能对比研究[J].电焊机,2020,50(4):70-74. MOU G,HUA X M,XU X B,et al.Comparative study on welding procedure and performance of 8 mm thick TC4 titanium alloy with TIG and MIG[J].Electric Welding Machine,2020,50(4):70-74.
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【15】左晓婷,张鹏,刘鸿彦,等.网篮组织TC4 ELI钛合金TIG焊接接头的性能分析[J].中国钛业,2018(4):34-38. ZUO X T, ZHANG P, LIU H Y, et al. Performance analysis of TIG welded joint of TC4 ELI titanium alloy with basket-weave microstructure[J]. China Titanium Industry, 2018(4):34-38.
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