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基于原位观察的 TC4 钛合金焊接接头组织与变形机制研究
Research on the Microstructure and Deformation Mechanism of TC4Titanium Alloy Welded Joints Based on In Situ Observations
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- DOI:
- 作者:
- 邵嘉君 1，贾润晨 1，李 倩 2，张思远 2，辛社伟 2，曾卫东 1
SHAO Jiajun1, JIA Runchen1, LI Qian2, ZHANG Siyuan2, XIN Shewei2, ZENG Weidong1
- 作者单位:
- 1. 西北工业大学 凝固技术全国重点实验室，陕西 西安 710072；2. 西北有色金属研究院，陕西 西安 710016
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. NorthwestInstitute for Nonferrous Metal Research，Xi'an 710016, China
- 关键词:
- TC4；氩弧焊；显微组织；原位拉伸
TC4; tungsten inert gas; microstructure; in situ tensile
- 摘要:
- 系统探讨了 TC4 钛合金在氩弧焊后的组织演化与力学行为。 通过 EBSD 扫描与金相观察，揭示了焊缝区域温度梯度和择优取向对柱状晶生长的显著影响。 对热影响区进行组织重构分析表明， 原始 β 晶粒普遍呈现典型的<100> 织构取向；冷却过程中，片层 α 组织自 β 晶粒中析出时几乎未表现出明显的变体选择性，显示出取向保持特征。进一步结合 SEM 原位拉伸与断口显微分析，发现滑移线主要分布于母材区，以柱面滑移为主，且越靠近焊缝其数量越少；微裂纹主要起源于变形过程中晶界的开裂，表明晶界在塑性变形与断裂演化中发挥关键作用。
The microstructure evolution and mechanical behavior of a TC4 titanium alloy following tungsten inert gaswelding were systematically investigated. The influence of the temperature gradient and preferred orientation on the growthof columnar crystals in the weld zone was revealed through EBSD scanning and metallographic examination.Reconstruction analysis of the heat-affected zone (HAZ) indicates that the prior β grains generally exhibit a typical <100>texture orientation. During cooling, the lamellar α phase precipitated from the β grains shows almost no distinct variantselection, demonstrating characteristics of crystallographic inheritance. A combination of in situ SEM tensile tests andfracture microscopy reveals that slip lines are predominantly distributed in the base metal zone and decrease in numbercloser to the weld, which is dominated by prismatic slip. Microcracks are found to nucleate primarily at grain boundariesduring deformation, indicating that grain boundaries play a critical role in plastic deformation and fracture evolution.