完全反向应力循环下，焊后时效处理对AA6061-T651铝合金搅拌摩擦焊接接头无缺口和有缺口试样组织特征及疲劳行为的影响

Q4 Materials Science

Welding International Pub Date : 2023-10-16 DOI:10.1080/09507116.2023.2267429

Hemendra Kumar Srivastava, V. Balasubramanian, S. Malarvizhi, A. Gourav Rao

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引用次数: 0

摘要

摘要:对aa6061 - t651铝合金搅拌摩擦焊接(FSW)接头在完全反向循环加载(R =−1)条件下的旋转弯曲疲劳行为进行了对比研究。焊后对焊接接头进行200℃时效处理8 h。经焊后时效处理后，合金的疲劳强度显著提高，而晶粒尺寸保持不变。利用取向成像显微镜(OIM)和透射电镜(TEM)研究了焊接时效处理前后的组织演变。结果表明，焊后时效处理通过细小的β″(Mg2Si)颗粒的再析出，降低了位错密度，促进了析出硬化。FSW接头焊后时效试样的细小颗粒被循环加载过程中产生的位错剪切，导致裂纹难以起裂和弯曲扩展。断口分析结果表明，由于沿晶界存在明显的析出相，焊后时效试样的抗疲劳性能优于焊接态试样。致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢致谢作者感谢印度孟买的海军材料研究实验室(NMRL-DRDO)为开展这项调查提供了基础材料。作者还感谢印度理工学院坎普尔分校允许他们使用他们的EBSD设施。披露声明作者声明，他们没有已知的竞争经济利益或个人关系，可能会影响本文所报道的工作。

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Influence of post weld aging treatment on microstructural features and fatigue behaviour of unnotched and notched specimens of friction stir welded AA6061-T651 aluminium alloy joints under completely reversed stress cycle

AbstractA comparative investigation on rotating bending fatigue behaviour between unnotched and notched specimens of friction stir-welded (FSW) AA6061-T651aluminium alloy joints has been conducted under completely reversed cyclic loading (R = −1). Post-weld aging treatment was done for 8 h at 200°C on the welded joints. After post-weld aging treatment, the fatigue strength was significantly improved, while the grain size remained unchanged. Microstructural evolution before and after post-weld aging treatment was studied using orientation imaging microscopy (OIM) and transmission electron microscopy (TEM). It was found that post-weld aging treatment decreased dislocation density and facilitated precipitation hardening through the reprecipitation of fine β″(Mg2Si) particles. Fine particles of post-weld aged specimens of FSW joints were sheared by dislocations generated during cyclic loading, resulting in difficult crack initiation and tortuous crack propagation. Fractographic results confirmed that Post-weld aged specimens of FSW joints have better fatigue resistance than as-welded specimens, owing to the presence of significant precipitates along the grain boundary.Keywords: Friction stir weldingpost weld ageing treatmentfatigue behaviorS-N curvesmicrostructure AcknowledgementsThe authors wish to record sincere thanks to the Director of Naval Materials Research Laboratory (NMRL), DRDO, Ambernath Maharashtra for the financial support rendered through a CARS project No: NMRL/MMG/0401/04/NMRL253/CARS/145/2020-21. The authors thank the Naval Materials Research Laboratory (NMRL-DRDO), Mumbai, India, for providing base materials to carry out this investigation. The authors also thank IIT Kanpur for allowing them to use their EBSD facility.Disclosure statementThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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来源期刊

Welding International Materials Science-Metals and Alloys

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： Welding International provides comprehensive English translations of complete articles, selected from major international welding journals, including: Journal of Japan Welding Society - Japan Journal of Light Metal Welding and Construction - Japan Przeglad Spawalnictwa - Poland Quarterly Journal of Japan Welding Society - Japan Revista de Metalurgia - Spain Rivista Italiana della Saldatura - Italy Soldagem & Inspeção - Brazil Svarochnoe Proizvodstvo - Russia Welding International is a well-established and widely respected journal and the translators are carefully chosen with each issue containing a balanced selection of between 15 and 20 articles. The articles cover research techniques, equipment and process developments, applications and material and are not available elsewhere in English. This journal provides a valuable and unique service for those needing to keep up-to-date on the latest developments in welding technology in non-English speaking countries.