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Processing-microstructure-property correlations for temperature-controlled friction stir welding of 304L SS plates
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2020-12-31 , DOI: 10.1016/j.msea.2020.140635
Madhumanti Bhattacharyya , Arnab Kundu , Krishnan S. Raja , Jens Darsell , Saumyadeep Jana , Indrajit Charit

Friction stir welding (FSW) is being considered as a potential repair welding technique for various engineering applications. In this study, an effort was made to explore the correlation between microstructure and mechanical properties in FSWed 304L stainless steel (SS) plates. An in-house developed weld temperature control algorithm was used during FSW of 304L SS plates. FSW was performed at two different temperatures, 725 and 825 °C, in order to repair simulated cracks introduced by electrical discharge machining (EDM) in the 304L plates. Optical microscopy and scanning electron microscopy revealed ultrafine grained microstructure in some parts of the stir zone (SZ) of the FSW nugget, which is attributed to dynamic recrystallization occurring during FSW. A significant decrease in the fraction of ∑3 special boundaries with concomitant decrease in the number of annealing twins was noticed in SZ as compared to the base metal. Vickers microhardness profiles across the SZ showed increase in hardness which was due to significant grain refinement. Tensile tests were carried out across the weld bead, and failure was found to occur in the base metal, indicating an overmatching FSW nugget.



中文翻译:

304L SS板温控摩擦搅拌焊接的加工组织与性能的相关性

搅拌摩擦焊(FSW)被认为是各种工程应用中的一种潜在的修复焊接技术。在这项研究中,我们努力探索FSWed 304L不锈钢(SS)板的微观结构与力学性能之间的相关性。内部开发的焊接温度控制算法用于304L SS板的FSW。为了修复在304L板上由放电加工(EDM)引入的模拟裂纹,在两个不同的温度(725和825°C)下执行FSW。光学显微镜和扫描电子显微镜显示了FSW熔核搅拌区(SZ)某些部分的超细晶粒微观结构,这归因于FSW期间发生的动态重结晶。与贱金属相比,SZ中∑3特殊边界的分数显着降低,退火孪晶的数量随之减少。SZ上的维氏显微硬度分布图表明,由于晶粒细化,硬度有所提高。在焊缝上进行了拉伸测试,发现母材中发生了破坏,表明FSW熔核过匹配。

更新日期:2021-01-11
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