Effect of rapid cooling on mechanical properties of welded joint in laser welding of DP1000 dual phase steel

被引：0

作者：

Wang J. ^{[1
,2
]}

Yang L. ^{[2
]}

Sun M. ^{[2
]}

Li C. ^{[1
]}

Li B. ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan

[2] School of Materials Science and Engineering, Tianjin University, Tianjin

来源：

Hanjie Xuebao/Transactions of the China Welding Institution | 2019年 / 40卷 / 01期

关键词：

DP1000 dual phase steel; Laser welding; Mechanical property; Rapid cooling;

D O I：

10.12073/j.hjxb.2019400023

中图分类号：

学科分类号：

摘要：

The softening phenomenon in heat affected zone existed in the laser welding processing of DP1000 dual phase high strength steel, which affected the formability and performance of welded structure seriously. In order to improve the formability and performance of welded joint, the way of rapid cooling was used to improve the softening in the heat affected zone of DP1000 dual phase steel laser welding. The microstructure and mechanical properties of welded joint of 1.5 mm thickness DP1000 steel plate with rapid cooling and air cooling were analyzed contrastively through the equipment of tensile tester, micro-hardness tester, scanning electron microscopy and optical microscopy. The results showed that softening zones in heat affected zone of welded joint was narrower under the condition of rapid cooling than under no rapid cooling during laser welding DP1000 dual phase steel. The softening phenomenon improved. The tensile strength and elongation were increased. © 2019, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.

引用

页码：113 / 118

页数：5

共 10 条

[1]

Tang D., Mi Z., Chen Y., Technology and research and development of advanced automobile steel abroad, Iron & Steel, 40, 6, pp. 1-15, (2005)

[2]

Wang W., Ma K., Sun D., Et al., Microstructures and properties of CO <sub>2</sub> laser welded 600MPa DP steel , Transactions of the China welding institution, 31, 9, pp. 25-29, (2010)

[3]

Baltazar Hernandez V.H., Nayak S.S., Zhou Y., Tempering of martensite in dual-phase steels and its effects on softening behavior, Metallurgical and Materials Transactions A, 42, 10, pp. 3115-3129, (2011)

[4]

Farabia N., Chen D., Li J., Et al., Microstructure and mechanical properties of laser welded DP600 steel joints, Materials Science and Engineering A, 527, 4-5, pp. 1215-1222, (2010)

[5]

Wang J., Wang L., Yang L., Et al., Research on microstructure and properties of laser welding DP1000 high-strength steel weld joints, Chinese Journal of Lasers, 41, 9, pp. 83-89, (2014)

[6]

Panda S.K., Baltazar Hernandez V.H., Kuntz M.L., Et al., Formability analysis of diode-laser-welded tailored blanks of advanced high-strength steel sheets, Metallurgical and Materials Transaction A, 40, pp. 1955-1967, (2009)

[7]

Xia M., Sreenivasan N., Lawson S., Et al., A comparative study of formability of diode laser welds in DP980 and HSLA steels, Journal of Engineering Materials and Technology, 129, pp. 446-452, (2007)

[8]

Xia M., Biro E., Tian Z., Et al., Effects of heat input and martensite on HAZ softening in laser welding of dual-phase steels, ISIJ International, 48, 6, pp. 809-814, (2008)

[9]

Nayak S.S., Baltazar Hernandez V.H., Zhou Y., Effect of chemistry on nonisothermal tempering and softening of dual-phase steels, Metallurgical and Materials Transactions A, 42, pp. 3242-3248, (2011)

[10]

Wang J.F., Yang L.J., Sun M.S., Et al., A study of the softening mechanisms of laser-welded DP1000 steel butt joints, Materials and Design, 97, pp. 118-125, (2016)

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