Effect of Rotation Speed on the Microstructure and Mechanical Properties of Friction Stir Welding of Joint High Strength Steel Q&P980
LIN Hongtao1, MENG Qiang2, WANG Yisong1,2, WANG Jiayi1, ZHANG Yun1, JIANG Haitao1
1 Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China; 2 Aviation Industry Corporation of China Manufacturing Technology Institute, Beijing 100024, China
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.
蔺宏涛, 孟强, 王怡嵩, 王家毅, 张韵, 江海涛. 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[J]. 材料导报, 2020, 34(6): 6126-6131.
LIN Hongtao, MENG Qiang, WANG Yisong, WANG Jiayi, ZHANG Yun, JIANG Haitao. Effect of Rotation Speed on the Microstructure and Mechanical Properties of Friction Stir Welding of Joint High Strength Steel Q&P980. Materials Reports, 2020, 34(6): 6126-6131.
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2020, Vol. 34 
