Effect on Hardness and Microstructures of Rail Joint with Ultra-Narrow Gap Arc Welding by Post Weld Heat Treatment

Lian Gong; Liang Zhu; Hong Xiang Zhou

doi:10.4028/www.scientific.net/KEM.737.90

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Modelling Kerf Width in WEDM Titanium Alloy Using Response Surface Methodology
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Effect on Hardness and Microstructures of Rail Joint with Ultra-Narrow Gap Arc Welding by Post Weld Heat Treatment
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 737Effect on Hardness and Microstructures of Rail...

Effect on Hardness and Microstructures of Rail Joint with Ultra-Narrow Gap Arc Welding by Post Weld Heat Treatment

Abstract:

U71Mn rails were welded by ultra-narrow gap welding with constrained arc by flux strips，then normalizing treatment and stress relief annealing were performed for the joints. Another sample with no heat treatment, was studied in comparison. The effect of post weld heat treatment on the hardness and microstructure of rail joint were studied by scanning electron microscope (SEM) and microhardness test. The test results showed that normalizing treatment can improve the hardness of weld seam and base metal, and stress relief annealing couldn’t improve the hardness of joints obviously.

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Periodical:

Key Engineering Materials (Volume 737)

Pages:

90-94

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.737.90

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Online since:

June 2017

Authors:

Lian Gong*, Liang Zhu, Hong Xiang Zhou

Keywords:

Hardness, Microstructure, Rail with Normalizing, Ultra-Narrow Gap Welding

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* - Corresponding Author

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