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Improving the mechanical properties of PHS laser welded joints by adding Ni foil to suppress Î ́-ferrite by Chen, Xiaming; Wang, Xiaonan; Sun, Qian; Hu, Zengrong; Huan, Pengcheng; Yi, Ge; Hiromi, Nagaumi; Di, Hongshuang; Sun, Lining is a Engineering article available to read on EtoBox.

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Ni foils with various thickness were used as interlayer to achieve the laser tailored welding of 22MnB5 press-hardened steel (PHS) with Al-Si coating. The effect of Ni content on the microstructure, hardness and strength were studied. The results showed that Ni reduced the content of solidified primary ı phase in the fusion zone, and promoted the transformation from ı phase into phase. ı ferrite was absent with the Ni content of 4.7-19.5 wt.%. In addition, the fusion zone was in phase region during post-weld heat treatment at 950 • C because Ni can reduce the A c3 temperature (the temperature at all ferrite was transformed into austenite). The microstructure of fusion zone after post-weld heat treatment was lath martensite with the Ni content of 4.7-11.2 wt.%. The average hardness was similar to base metal, and the tensile strength of welded joint was increased by ∼22% of as-received joint. Ni was effective to suppress the formation of ı ferrite in Al-rich fusion zone, which is potential to achieve the laser welding of PHS with Al-Si coating.

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Author

Chen, Xiaming; Wang, Xiaonan; Sun, Qian; Hu, Zengrong; Huan, Pengcheng; Yi, Ge; Hiromi, Nagaumi; Di, Hongshuang; Sun, Lining

Publisher

Elsevier ; Elsevier Editora Ltda; Elsevier BV (ISSN 2238-7854)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)