Study on tensile and fatigue failure in the low-hardness zone of AA2519-T62 FSW joint

IF 1.9 Q3 ENGINEERING, MANUFACTURING

Manufacturing Review Pub Date : 2022-01-01 DOI:10.1051/mfreview/2022023

R. Kosturek, T. Ślęzak, J. Torzewski, M. Wachowski, L. Śnieżek

引用次数: 4

Abstract

The aim of this research was to investigate the basic performance and failure of AA2519-T62 friction stir welded joint in tensile test and in low cycle fatigue regime. It has been reported that at the retreating side, the layer of overgrowth grains undergoes deformation in the TMAZ and forms a characteristic large-grain band partly surrounding the SZ. The reported UTS is very high and it equals 405 MPa, what corresponds to 86.5% joint efficiency value. The failure occurred in the LHZ at the retreating side with the fracture mechanism characterized by simultaneously cracking in several parallel planes. The LCF behavior of the tested joint indicates three stages of fatigue life: a relatively long period of cyclic hardening (up to 500–1000 cycles), the longest period of cyclic stabilization, followed by cyclic softening until failure. The fatigue crack initiation takes place in the near-surface layer of overgrown grains and then propagates through the low-hardness zone.

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AA2519-T62 FSW接头低硬度区拉伸疲劳破坏研究

研究了AA2519-T62搅拌摩擦焊接接头在拉伸试验和低周疲劳状态下的基本性能和失效规律。有报道称，在后退侧，过度生长的晶粒层在TMAZ内发生变形，形成了部分环绕SZ的特征性大晶粒带。报告的UTS非常高，为405 MPa，相当于86.5%的关节效率值。破坏发生在后退侧LHZ处，断裂机制为多个平行面同时开裂。测试接头的LCF行为表明疲劳寿命的三个阶段:相对较长的循环硬化期(高达500-1000次循环)，最长的循环稳定化期，然后是循环软化直至失效。疲劳裂纹首先发生在过长晶粒的近表层，然后通过低硬度区扩展。

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

Manufacturing Review ENGINEERING, MANUFACTURING-

CiteScore

5.40

自引率

12.00%

发文量

审稿时长

8 weeks

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