Influence of tool plunging rate on mechanical properties and microstructure of friction stir welded DMR249A high strength low alloy (HSLA) steel butt joints

IF 2.4 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Testing Pub Date : 2023-08-21 DOI:10.1515/mt-2023-0043

Seerangan Ragu Nathan, V. Balasubramanian, A. Gourav Rao, Tushar Sonar, M. Ivanov, C. Rajendran

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Abstract

Abstract The main aim of this study is to analyse the influence of tool plunging rate on tool wear and stir zone characteristics of DMR249A high strength low alloy (HSLA) steel joints developed using friction stir welding (FSW). The HSLA steel plates were welded at five levels of tool plunging rates varying from 2.0 mm min−1 to 3.0 mm min−1. The tool rotational speed of 600 rpm and welding speed of 30 mm min−1 were kept constant during welding. The wear of FSW tool was analysed by microscopic observations of tool condition after welding, stir zone characteristics, weight loss measurement and pin profile analysis. The characterization techniques of optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to analyse the microstructural characteristics of stir zone of welded joints. Results disclosed that the severe degradation of FSW tool occurred due to the sudden dynamic impact load on tool pin while plunging and more diffusion of work piece material into the tool pin which leads to insufficient plasticized material flow. The tool plunging rate of 2.5 mm min−1 showed minimum tool wear and produced defect free sound joint.

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刀具跌落速率对搅拌摩擦焊接DMR249A高强度低合金(HSLA)钢对接接头力学性能和组织的影响

摘要本研究的主要目的是分析刀具下陷速率对采用搅拌摩擦焊(FSW)开发的DMR249A高强度低合金(HSLA)钢接头刀具磨损和搅拌区特性的影响。在2.0 mm min−1到3.0 mm min−1的5个水平下焊接HSLA钢板。焊接过程中，保持刀具转速600 rpm和焊接速度30 mm min−1不变。通过焊接后刀具状态的微观观察、搅拌区特征、失重测量和销形分析，对FSW刀具的磨损进行了分析。采用光学显微镜(OM)、扫描电镜(SEM)和透射电镜(TEM)表征技术对焊接接头搅拌区的组织特征进行了分析。结果表明:由于刀销在突降过程中受到突然的动冲击载荷，工件材料向刀销扩散加剧，导致塑化料流不足，导致了FSW刀具的严重退化;刀具下陷速度为2.5 mm min−1时，刀具磨损最小，接头无缺陷。

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来源期刊

Materials Testing 工程技术-材料科学：表征与测试

CiteScore

4.20

自引率

36.00%

发文量

165

审稿时长

4-8 weeks

期刊介绍： Materials Testing is a SCI-listed English language journal dealing with all aspects of material and component testing with a special focus on transfer between laboratory research into industrial application. The journal provides first-hand information on non-destructive, destructive, optical, physical and chemical test procedures. It contains exclusive articles which are peer-reviewed applying respectively high international quality criterions.