Materials Reports  2021, Vol. 35 Issue (Z1): 447-453 |
| METALS AND METAL MATRIX COMPOSITES |
|
|
|
|
|
| Microstructure and Mechanical Properties of Laser Welded Joint of High Strength Steel QP980 |
| TIAN Fei1, LIN Hongtao1, JIANG Haitao2
|
1 Technology Center, Hunan Hualing Lianyuan Iron & Steel Co., LTD, Loudi 417009, China
2 National Engineering Research Center for Advanced Rolling Technology, University of Science and Technology Beijing, Beijing 100083, China |
|
|
|
|
Abstract In order to solve the welding problems such as component segregation, hardening embrittlement and hydrogen-induced cracking of high strength steel QP980 in automobile lightweight application, the laser welding of QP980 steel was studied, and the welding test of 1.2mm thick QP980 steel was carried out. The microstructure and mechanical properties of the welds were evaluated. It was found that the joints with full penetration and well-formed surface could be obtained under the selected welding parameters. The cross section of the laser welding joints shows hourglass shape, and the joints can be divided into the fusion zone (FZ), the coarse-grained heat affected zone (CGHAZ), the fine-grained heat affected zone (FGHAZ), the intercritical heat affected zone (ICHAZ), the subcritical heat affected zone (SCHAZ) and the BM. The hardness of the FZ and some HAZ of the joints under different welding process parameters are higher than the BM. The highest hardness is in the FGHAZ and there is a softening zone at both sides of the weld. With the increase of heat input, the width of the FZ and the HAZ becomes larger, and the softening zone is further away from the weld center. Under different welding process parameters, the tensile strength of the joints can reach the strength of the BM, the yield strength is higher than the BM, and the elongation of the joints is lower than the BM, it indicated that the joints with good performance have been obtained under the selected welding process parameters.
|
|
Published: 16 July 2021
|
|
|
| Fund:National Key R＆D Program of China (2016YFB0101606), the Aviation Science Foundation of China (20181174). |
| About author:: Fei Tian, is the vice director of Technology Center of Hunan Hualing Lianyuan Iron & Steel Co., Ltd., and a senior engineer. He graduated from Inner Mongolia University of Science and Technology in 2001. After graduation, he have been working in Hunan Hualing Lianyuan Iron & Steel Co., Ltd. He is mainly engaged in the development of cold-rolled sheet, galvanized sheet, high strength steel and electrical steel, customer application technical services and management work. He has also published more than ten academic papers and received many autho-rized patents so far.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 Tita-nium 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 autho-rized patents so far. |
|
|
1 李激光, 张金栋, 黄海亮, 等. 材料导报, 2012, 26(专辑19), 397.
2 Nanda T, Singh V, Singh V, et al.Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application, 2019, 233(2), 209.
3 Zheng G, Li X, Chang Y, et al.Journal of Materials Engineering and Performance, 2018, 27(8), 530.
4 Speer J G, Matlock D K, De Cooman B C.Acta Materialia, 2003, 51(9), 2611.
5 Speer J G, Edmonds D V, Rizzo F C.Current Opinion in Solid State and Materials Science, 2004, 8(3), 219.
6 李得胜. 汽车用钢的激光搭接焊与电阻点焊的对比试验研究. 硕士学位论文, 湖南大学, 2010.
7 李亚江.高强钢的焊接, 冶金工业出版社, 2010.
8 Eurico A, Quintino L, Miranda R.International Journal of Advanced Manufacturing Technology, 2010, 49(1), 123.
9 Staufer H.International Journal of Microstructure and Materials Properties, 2010, 5(2), 234.
10 Hong K M , Shin Y C.Journal of Materials Processing Technology, 2017, 245, 46.
11 Jia Q, Guo W, Peng P, et al.Journal of Materials Engineering and Performance, 2016, 25(2), 668.
12 董丹阳, 刘杨, 王磊, 等. 金属学报, 2013, 49(12), 1493.
13 Lun N, Saha D C, Macwan A, et al.Materials and Design, 2017, 131, 450.
14 Guo W, Wan Z, Peng P, et al.Journal of Materials Processing Technology, 2018, 256,229.
15 Wang X N, Sun Q, Zheng Z, et al.Materials Science and Engineering A, 2017, 699, 18.
16 Wang X N, Chen C J, Wang H S, et al.Journal of Materials Processing Technology, 2015, 226, 106.
17 Li W, Ma L, Peng P, et al.Materials Science and Engineering A, 2018, 717, 124. |
|
|
|
渝公网安备50019002502923号 © Editorial Office of Materials Reports.
