NDLI: Effect of chemical composition on microstructure and mechanical properties of laser weld metal of high-tensile-strength steel

Content Provider	Springer Nature Link
Author	Sumi, Hiroyuki Oi, Kenji Yasuda, Koichi
Copyright Year	2014
Abstract	Laser beam welding (LBW) and laser-arc hybrid welding are expected to be applied to welding of high-strength steel plates over 780 MPa, because they have advantages such as low distortion and a narrow heat-affected zone. This research examined the relationship between the chemical composition of high-strength steel plates and the microstructure and mechanical properties of the weld metal with the aim of improving the toughness of welded joints of high-strength steels by the LBW process. The results revealed that weld metal toughness is strongly dependent on the carbon (C) content of the steel plates, and excellent toughness can be obtained in weld metals with low C contents having an almost fully lower bainite structure without formation of slender martensite austenite constituent (MA). Based on these results, a guideline for appropriate alloying element design for high-strength steels for LBW was proposed, targeting mechanical properties of tensile strength ≥980 MPa and toughness vE$_{−40 °C}$ ≥ 47 J.
Starting Page	173
Ending Page	178
Page Count	6
File Format	PDF
ISSN	00432288
Journal	Welding in the World
Volume Number	59
Issue Number	2
e-ISSN	18786669
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-08-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Toughness Weld metal Metallic Materials Microstructure Hardness Theoretical and Applied Mechanics Laser welding Continuum Mechanics and Mechanics of Materials High-strength steels
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Mechanical Engineering

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