Joint Microstructure and Properties of D36 Steel Using Narrow Gap Laser Welding

doi:10.3788/LOP202158.1714008

	Joint Microstructure and Properties of D36 Steel Using Narrow Gap Laser Welding
	Chai Xutian 3; Yin Yan 3; Wang Zhipeng 3; Dong Kaiji 3; Li Zhihui 3; Zhang Ruihua 1,2
刊名	LASER & OPTOELECTRONICS PROGRESS
	2021-09-01
卷号	58 期号:17
关键词	laser technique narrow gap filler wire welding mechanical properties microstructure
ISSN号	1006-4125
DOI	10.3788/LOP202158.1714008
英文摘要	The low-alloy and high-strength steel D36 is joined by narrow-gap laser wire-filled welding, which results in good multi-layer and multi-pass thick plate welding without cracks, pores, and other defects after welding. The microstructure and mechanical properties of the welded joints are analyzed by the tension and bending test, microhardness test, microstructure observation, and other analytical methods. The results show that the coarse-grained heat- affected zone consists of a large number of lamellar martensite, and the microstructure of the finegrained zone is composed of the fine-grained pearlite and ferrite. The weld center structure is proeutectoid ferrite + acicular ferrite + granular bainite. The regions with filler wire weld bead hardness in order from high to low is heat affected zone, weld center, and base material. The regions with laser primer welding hardness in order from high to low is weld center, heat affected zone, and base metal. The tensile specimens of the welded joints all fractured at the base metal position. The fracture is at an angle of 45 degrees with the force direction, and there is obvious necking, which is a typical ductile fracture. The average tensile strength of the welds is 537 MPa, and the average elongation after fracture is 15. 6%.
WOS研究方向	Engineering ; Optics
语种	中文
出版者	SHANGHAI INST OPTICS & FINE MECHANICS, CHINESE ACAD SCIENCE
WOS记录号	WOS:000752851300034
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/155617]
专题	材料科学与工程学院
作者单位	1.China Iron & Steel Res Inst Grp, Beijing 100081, Peoples R China; 2.Hardware Knife Cut Ind Technol Res Inst Yangjiang, Yangjiang 529533, Guangdong, Peoples R China 3.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China;
推荐引用方式 GB/T 7714	Chai Xutian,Yin Yan,Wang Zhipeng,et al. Joint Microstructure and Properties of D36 Steel Using Narrow Gap Laser Welding[J]. LASER & OPTOELECTRONICS PROGRESS,2021,58(17).
APA	Chai Xutian,Yin Yan,Wang Zhipeng,Dong Kaiji,Li Zhihui,&Zhang Ruihua.(2021).Joint Microstructure and Properties of D36 Steel Using Narrow Gap Laser Welding.LASER & OPTOELECTRONICS PROGRESS,58(17).
MLA	Chai Xutian,et al."Joint Microstructure and Properties of D36 Steel Using Narrow Gap Laser Welding".LASER & OPTOELECTRONICS PROGRESS 58.17(2021).