Microstructure and Properties of Pulsed Laser Welded Joint of Cold-rolled DP590 Dual Phase Steel Sheet

SUN Qian; DI Hong-shuang

doi:10.11973/jxgccl201608013

Materials and Mechanical Engineering > 2016 > 40(8): 53-57. > DOI: 10.11973/jxgccl201608013

SUN Qian, DI Hong-shuang. Microstructure and Properties of Pulsed Laser Welded Joint of Cold-rolled DP590 Dual Phase Steel Sheet[J]. Materials and Mechanical Engineering, 2016, 40(8): 53-57. DOI: 10.11973/jxgccl201608013

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Microstructure and Properties of Pulsed Laser Welded Joint of Cold-rolled DP590 Dual Phase Steel Sheet

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Received Date: June 12, 2016

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The cold-rolled DP590 dual phase steel sheets with 1 mm thickness were butt-welded by the pulsed laser welding and the microstructure, mechanical properties and formability of the welded joint were studied. The results show that the microstructure of fusion zone (FZ), heat affected zone (HAZ) and base material (BM) consisted with lath martensite, ferrite and lath martensite, ferrite and martensite respectively. The average micro-hardness of FZ, HAZ and BM was 344, 275, 205 HV respectively. The tensile fracture position of the welded joint was in BM, which showed a ductile fracture. During the Erichsen test, the cracks formed at the center of FZ and then propagated into HAZ and BM perpendicular to FZ. The cracks propagated in FZ by cutting the lath martensite and in HAZ and BM along the ferrite and martensite interface. The formability of welded joint was good and the Erichsen value reached 81.9% that of BM, meeting the requirements for production.
- dual phase steel,
- laser welding,
- microstructure,
- mechanical property,
- formability

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[1]	TSIPOURIDIS P, WEMER E, KREMPASZKY C, et al.Formability of high strength dual phase steels［J］. Steel Research, 2006, 77(9/10): 654-667.
[2]	叶平, 沈剑平, 王光耀, 等. 汽车轻量化用高强度钢现状及其发展趋势［J］. 机械材料工程, 2006, 30(4): 427-431.
[3]	BHATTACHARYA D. Developments in advanced high strength steels［C］// The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 Proceedings. Beijing: The Metallurgical Industry Press,2005: 69-75.
[4]	黄群飞, 何燕霖, 李麟. 高性能双相钢的研究进展［J］.热处理技术与装备, 2007, 28(3): 11-14.
[5]	张建, 吴青松, 郑江鹏, 等. DP780双相钢电阻点焊接头的显微组织和力学性能［J］. 机械工程材料,2015,39(10): 29-36.
[6]	陶博浩, 李红, 宋永伦,等.电阻点焊冷轧DP600双相钢焊接接头性能的正交试验分析［J］.焊接学报,2013,34(6): 81-84.
[7]	许君, 张延松, 朱平, 等. 双相钢搭接点焊接头疲劳寿命分析［J］. 焊接学报, 2008, 29(5): 45-48.
[8]	CHOVET C, GUIHEUX S. Possibilities offered by MIG and TIG brazing of galvanized ultra high strength steels for automotive applications［J］.Metallurgia Italiana, 2006, 98(7/8): 47-54.
[9]	FARABI N, CHEN D L, LI J, et al.Microstructure and mechanical properties of laser welded DP600 steel joints［J］. Materials Science and Engineering A, 2010,527(4): 1215-1222.
[10]	张琪,倪维源,贾进.车用先进高强钢DP590光纤激光焊接接头组织及性能研究［J］.热加工工艺,2014(15): 161-163.
[11]	WEI C H, ZHANG J, YANG S L, et al. Microstructures and mechanical properties for laser tailor welded blanks of DP590 and low carbon steels［J］. Rare Metal Materials and Engineering,2013,42(S2): 68-73.
[12]	计遥遥,洪永昌,张武.脉冲激光电压对DP600薄板焊接接头组织和性能的影响［J］.热处理,2012,27(6): 22-27.
[13]	景财年,范吉超,王华,等.激光焊接异种钢接头微观结构及耐蚀性［J］.材料热处理学报,2015,36(6): 104-108.
[14]	崔常京,杨璟,陈群志,等.激光焊接对TC4钛合金静强度与疲劳性能的影响［J］.机械工程材料,2015,39(1): 90-93.
[15]	康永林.现代汽车板工艺及成形理论与技术［M］.北京: 冶金工业出版社,2009: 220-240.

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