Investigating the impact toughness properties and influential factors of titanium alloy joints

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-10-16 DOI:10.1016/j.matchar.2024.114465

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引用次数: 0

Abstract

Double-sided symmetric MIG welding can significantly enhance welding efficiency for thick titanium alloys and holds promising engineering applications. However, the use of high currents and deposition rates in this process not only boosts welding efficiency but also impacts joint performance, particularly its impact toughness. In this study, the Charpy impact performance of double-sided double-arc MIG welded joints in each region was studied via oscillometric impact tests, and the main factors affecting the impact of joints were revealed. Scanning electron microscope was used to observe the fractures, and the microstructure characteristics and grain orientation of the impact crack propagation path were observed and analysed via metallurgical microscopy and EBSD. In addition, the microstructure of each region of the joint was observed via metallographic microscopy and transmission electron microscopy, which revealed the microstructure characteristics of different regions of the joint and clarified the effects of microstructure and grain orientation in different regions of the welded joint on the impact performance of each region of the double-sided, double-arc MIG welded joint. The results show that the crack initiation energy across different regions of joints typically ranges between 18 and 20 J, with minimal variations. Crack propagation plays a pivotal role in determining impact toughness, which is influenced both by microstructural features and orientation. This provides guidance for subsequent adjustments and improvements to the impact performance of the joint.

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研究钛合金接头的冲击韧性特性和影响因素

双面对称 MIG 焊接可显著提高厚钛合金的焊接效率，在工程应用中大有可为。然而，在此过程中使用大电流和熔敷率不仅会提高焊接效率，还会影响接头性能，尤其是其冲击韧性。本研究通过示波冲击试验研究了双面双弧 MIG 焊点各区域的夏比冲击性能，并揭示了影响焊点冲击的主要因素。使用扫描电子显微镜观察断口，并通过金相显微镜和 EBSD 观察和分析冲击裂纹扩展路径的微观结构特征和晶粒取向。此外，还通过金相显微镜和透射电子显微镜观察了焊点各区域的微观结构，揭示了焊点不同区域的微观结构特征，明确了焊点不同区域的微观结构和晶粒取向对双面双弧 MIG 焊点各区域冲击性能的影响。结果表明，焊点不同区域的裂纹起始能量通常介于 18 到 20 J 之间，差异极小。裂纹扩展在决定冲击韧性方面起着关键作用，而冲击韧性又受到微观结构特征和取向的影响。这为后续调整和改进接头的冲击性能提供了指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.