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Microstructure and mechanical properties of laser welded DP600 steel joints by N. Farabi; D.L. Chen; J. Li; Y. Zhou; S.J. Dong is a Engineering article available to read on EtoBox.

What is Microstructure and mechanical properties of laser welded DP600 steel joints about?

To reduce fuel consumption and greenhouse gas emissions, dual phase (DP) steels have been considered for automotive applications due to their higher tensile strength, better initial work hardening along with larger elongation compared to conventional grade of steels. In such applications welding and joining have to be involved, which would lead to a localized alteration of materials and create potential safety and reliability issues under cyclic loading. The aim of this investigation was to evaluate microstructural change after laser welding and its effect on the tensile and fatigue properties in DP600 steel. The welding resulted in a significant increase of hardness in the fusion zone, but also the formation of a soft zone in the outer heat-affected zone (HAZ). While the ductility decreased after welding, the yield strength increased and the ultimate tensile strength remained almost unchanged. Fatigue life at higher stress amplitudes was almost the same between the base metal and welded joints despite slightly lower fatigue limit after welding. Tensile fracture and fatigue failure at higher stress amplitudes occurred at the outer HAZ. Fatigue crack initiation was observed to occur

Who reads Microstructure and mechanical properties of laser welded DP600 steel joints?

Author

N. Farabi; D.L. Chen; J. Li; Y. Zhou; S.J. Dong

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-5093)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)