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HomeSolid State PhenomenaSolid State Phenomena Vol. 353Micro-Alloying Effect on the Inter-Critical Grain...

Micro-Alloying Effect on the Inter-Critical Grain Coarsened Heat Affected Zone of a S355 Steel Welded Joint

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Abstract:

The inter-critical heat affected zone (ICHAZ) appears to be one of the most brittle sections in the welding of high-strength micro-alloyed steels (HSLA). Following repeated heating cycles in in with temperature ranging Ac₁ /Ac₃, the ICHAZ will face with an evident toughness and fatigue behavior reduction especially due to martensite-austenite constituent (MA) formation. Microalloying in high strength steels causes the generation of some phases in the matrix able to increase the mechanical properties of the joint. In this paper we report an investigation related to 1000 ppm vanadium addition in the welded joint of a structural S355 steel. The inter-critical zone of ta double pass welded joint is here reproduced by dilatometer, with second peak temperature ranging 720°C-790°C. The residual austenite dependence on inter-critical temperature is analyzed and related to the hardness behavior.

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Periodical:

Solid State Phenomena (Volume 353)

Pages:

129-134

DOI:

https://doi.org/10.4028/p-7vaGJD

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Online since:

December 2023

Authors:

Andrea Di Schino*, Mirko Sgambetterra, Rolf Schmidt, Giulia Stornelli, Anastasiya Tselikova

Keywords:

Micro-Alloying, Residual Austenite, Vanadium

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© 2023 Trans Tech Publications Ltd. All Rights Reserved

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