Interface welding mechanism and strengthening principle during friction stir spot welding of ultra-high strength C–Mn–Si martensitic steel

IF 3.1 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science and Technology of Welding and Joining Pub Date : 2022-11-08 DOI:10.1080/13621718.2022.2142389

Xiaopei Wang, Y. Morisada, K. Ushioda, H. Fujii

引用次数: 0

Abstract

Solid-state welding mechanism of ultra-high strength C–Mn–Si martensitic steel during friction stir spot welding (FSSW) was clarified and interface strengthening principle was revealed. We found that the generated oxides in the interface became spherical and dispersed, which was caused by selective oxidation due to the reduced oxygen partial pressure during high welding temperature. Then, these oxides were further refined and dispersed by severe material flow around the welding interface. Consequently, the refined and spherical (Mn, Si, Al)O amorphous oxides were formed. In addition, strong material flow introduced large drive force for grain boundary migration around the welding interface, which further facilitated the migration and dispersion of the generated (Mn, Si, Al)O oxides, giving rise to a high-strength welding interface.

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超高强度C–Mn–Si马氏体钢搅拌摩擦点焊界面焊接机理及强化原理

阐明了超高强度C–Mn–Si马氏体钢在搅拌摩擦点焊（FSSW）过程中的固态焊接机理，揭示了界面强化原理。我们发现，界面中产生的氧化物呈球形并分散，这是由于在高焊接温度下氧分压降低而导致的选择性氧化所致。然后，这些氧化物通过焊接界面周围的剧烈材料流动而被进一步细化和分散。因此，形成了精细的球形（Mn，Si，Al）O非晶氧化物。此外，强的材料流动为焊接界面周围的晶界迁移引入了大的驱动力，这进一步促进了生成的（Mn、Si、Al）O氧化物的迁移和分散，从而产生了高强度的焊接界面。

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

Science and Technology of Welding and Joining 工程技术-材料科学：综合

CiteScore

6.10

自引率

12.10%

发文量

审稿时长

1.7 months

期刊介绍： Science and Technology of Welding and Joining is an international peer-reviewed journal covering both the basic science and applied technology of welding and joining. Its comprehensive scope encompasses all welding and joining techniques (brazing, soldering, mechanical joining, etc.) and aspects such as characterisation of heat sources, mathematical modelling of transport phenomena, weld pool solidification, phase transformations in weldments, microstructure-property relationships, welding processes, weld sensing, control and automation, neural network applications, and joining of advanced materials, including plastics and composites.