旋转速度对高强度钢Q&P980搅拌摩擦焊接头组织与性能的影响

doi:10.11896/cldb.19030155

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Abstract In order to promote the application of high strength steel in automobile field and solve the problem of high strength steel welding by conventio-nal fusion welding,friction stir welding technique was applied on 1.2 mm thick Q&P980 steel sheets at rotation speeds of 200 r/min, 300 r/min, 400 r/min and 600 r/min. The microstructure and mechanical properties of the welds were evaluated. It was found that the weld without defects was obtained at different rotation speeds, and the joint structure presented a typical “bowl-shaped” structure. At the rotation speed of 200 r/min, the microstructure of the stirring zone of the joint was still martensite and ferrite, but the grain size was obviously refined and the martensite content was obviously increased. At 400 r/min, the structure of the stirring zone was almost all martensite. At 600 r/min, a mixed martensite and bainite microstructure was in the stirring zone. The results of microhardness showed that the hardness of the stiring zone was obviously higher than that of the base metal, and there was a softening zone between the stirring zone and the base metal. When the rotation speed was 400 r/min, the tensile strength of the joint was the highest, reaching 1 070 MPa, 99% of the base metal, and the elongation was 11.2%, 50% of the base metal. The joint was fractured in the stirring zone at the rotation speed of 200 r/min, it was fractured near the softening zone of the joint at other rotation speeds, and the fracture was a ductile fracture.

Key words： high strength steel Q&P980 friction stir welding rotation speed microstructure mechanical properties

Published: 12 March 2020

CLC number:

TG456.9

Fund:This work was financially supported by the National Key R & D Program of China (2016YFB0101606).

About author:: Hongtao Lin, as a doctoral candidate in University of Science and Technology Beijing (USTB). He received his bachelor's degree in metallurgy engineering from Henan University of Science and Technology in September 2004—June 2008, received his master's degree in iron and steel metallurgy from Inner Mongolia University of Science and Technology in September 2008—June 2011. He worked in Wuhan Iron and Steel Company Limited from August 2011 to January 2014, worked in National Center for Quality Supervision and Inspection of Magnesium and Magnesium Alloy Products from February 2014 to August 2016. From September 2016 till now, he has been studying for a doctor's degree in material science and engineering at the Institute of Engineering Technology of USTB. Currently, he has participated in a number of projects such as National Key R＆D Program of China, and his research direction is FSW of dissimilar materials; Haitao Jiang, as a professor and doctoral tutor in University of Science and Technology Beijing (USTB), received the doctor's degree in Northwestern Polytechnical University (NWPU) with the guidance of professor Miaoquan Li and did his postdoctoral research in the School of Materials Science and Engineering in USTB from 2004 to 2006. Since 2006, he has been working in the National Engineering Research Center of Advanced Rolling in USTB mainly on the development of steel and iron materials and non-ferrous metals materials and also on the research of the production of plate and strip. He has cooperated with many large and medium iron and steel corporations like Anshan Iron and Steel Group Corporation, Wuhan Iron and Steel (Group) Corp, Handan Iron and Steel Corporation and Maanshan Iron and Steel Corporation and developed pipeline steel from X42 to X100, hot and cold rolled automobile steel, container boiler plate and container plate. He has cooperated with the Boeing Company and developed the high formability magnesium alloy. He also cooperated with Jintian Titanium Industry and developed production process of materials like TA2, TC4 titanium alloy plate and titanium clad steel plate. He has a dozen programs of NSFC (Natural Science Foundation of China), National Key R＆D Program of China and the Beijing municipal science and technology plan projects. He has also published over two hundred academic papers and received many authorized patents so far.

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Cite this article:

LIN Hongtao,MENG Qiang,WANG Yisong, et al. Effect of Rotation Speed on the Microstructure and Mechanical Properties of Friction Stir Welding of Joint High Strength Steel Q&P980[J]. Materials Reports, 2020, 34(6): 6126-6131.

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http://www.mater-rep.com/EN/10.11896/cldb.19030155 OR http://www.mater-rep.com/EN/Y2020/V34/I6/6126

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