首页|钛合金厚板磁控窄间隙TIG焊接接头的组织与性能

钛合金厚板磁控窄间隙TIG焊接接头的组织与性能

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针对影响Ti-6Al-4V合金厚板磁控窄间隙TIG焊接接头力学行为的微观组织因素展开研究.测定了 100 mm厚Ti-6Al-4V接头的显微硬度分布和室温拉伸性能,采用数字图像关联技术监测拉伸过程的应变分布,通过全面的微观组织表征揭示接头组织不均匀性对力学行为的影响.结果表明:接头抗拉强度达到 893 MPa,接头强度系数达到94%,伸长率仅为 3.8%.热影响区组织不均匀性显著,由三种典型特征组织构成.靠近母材的热影响区发生了回复和部分再结晶,成为硬度和强度最薄弱区域,拉伸过程中首先发生屈服和颈缩.接头显著的组织不均匀性导致拉伸过程中发生严重的应变局域化现象,使得接头整体伸长率显著恶化.
Microstructure and Mechanical Properties of Magnetically Controlled Narrow Gap TIG Welding Joint of Titanium Alloy Thick Plate
The microstructure factors affecting the mechanical behavior of magnetically controlled narrow gap TIG welded joint of Ti-6Al-4V alloy thick plate were systematically studied.The microhardness distribution and tensile properties at room temperature of the 100mm thick Ti-6Al-4V joint were measured.The strain distribution during tensile process was recorded by digital image correlation technology.Through comprehensive microstructure characterization,the influence of joint microstructure heterogeneity on the mechanical behavior was revealed.The results show that the tensile strength of the joint reaches 893 MPa,the joint strength coefficient is 94%,and the elongation is only 3.8%.The microstructure of heat affected zone is composed of three characteristic structures and shows a significant microstructural heterogeneity.Recovery and partial recrystallization occurs in the heat affected zone near the base metal,which exhibits the lowest hardness and strength.Yield and necking first occur in this area during tensile process.The significant microstructural heterogeneity of the joint leads to serious strain localization during tensile process,which makes the overall elongation of the joint deteriorate significantly.

magnetically controlled narrow gap weldingtitanium alloy thick platemicrostructuremechanical property

丛成明、曾才有、张宇鹏、王海燕、赵鸿金、陈俊孚

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江西理工大学 材料冶金化学学部,江西 赣州 341000

广东省科学院中乌焊接研究所,广东 广州 510651

磁控窄间隙焊接 钛合金厚板 显微组织 力学性能

广东省科学院建设国内一流研究机构行动专项项目广东省科学院建设国内一流研究机构行动专项项目国家重点研发计划项目广州市科技项目广州市科技项目国家自然科学基金项目

2020GDASYL-202001031222021GDASYL-202101030812020YFE020530020180701003520180701001152005112

2024

10.14158/j.cnki.1001-3814.20220524

热加工工艺
中国船舶重工集团公司热加工工艺研究所 中国造船工程学会船舶材料学术委员会

热加工工艺

CSTPCD北大核心
影响因子：0.55
ISSN：1001-3814
年,卷(期)：2024.53(13)