VANADIUM ALLOYING IN S355 STRUCTURAL STEEL: EFFECT ON RESIDUAL AUSTENITE FORMATION IN WELDED JOINTS HEAT AFFECTED ZONE

Authors

  • Giulia Stornelli Universitu of Roma 'Tor Vergata', Department of Industrial Engineering https://orcid.org/0000-0002-5260-9067
  • Matteo Gaggiotti Università degli Studi di Perugia, Dipartimento di Ingegneria, Perugia
  • Daniele Mirabile Gattia Dipartimento Sostenibilità dei Sistemi Produttivi e Territoriali, ENEA - CR Casaccia, Roma
  • Rolf Schmidt Metals AG, Zug
  • Mirko Sgambetterra Aeronautica Militare – Divisione Aerea di Sperimentazione Aeronautica e Spaziale, Via Pratica di Mare 45, 00040 Pomezia RM
  • Anastasiya Tselikova Metals AG, Zug
  • Guido Zucca 5Aeronautica Militare – Divisione Aerea di Sperimentazione Aeronautica e Spaziale, Via Pratica di Mare 45, 00040 Pomezia RM
  • Andrea Di Schino Università degli Studi di Perugia, Dipartimento di Ingegneria, Perugia

DOI:

https://doi.org/10.36547/ams.28.3.1535

Keywords:

micro-alloying, vanadium, residual austenite

Abstract

The inter-critical heat affected zone (ICHAZ) appears to be one of the most brittle sections in the welding of high-strength micro-alloy steels (HSLA). Following multiple heating cycles in the temperature range between Ac1 and Ac3, the ICHAZ undergoes a strong loss of toughness and fatigue resistance, mainly caused by the formation of martensite-austenite constituent (MA). The presence of micro-alloying elements in HSLA steels induces variations in the formation of some microstructural constituents, more or less beneficial, which allow to improve the mechanical performance of a welded joint. The behavior in the inter-critical region of a S355 grade steel with 0.1wt% V addition is reported in this paper.  Five double-pass welding thermal cycles were simulated using a dilatometer, with the maximum temperature of the secondary peak in the inter-critical area, in the range between 720 ° C and 790 ° C. The residual austenite dependence on inter-critical temperature is analyzed and related to the hardness behavior.

Downloads

Published

2022-09-24

How to Cite

Stornelli, G., Gaggiotti, M., Gattia, D. M., Schmidt, R., Sgambetterra, M., Tselikova, A., Zucca, G., & Schino, A. D. (2022). VANADIUM ALLOYING IN S355 STRUCTURAL STEEL: EFFECT ON RESIDUAL AUSTENITE FORMATION IN WELDED JOINTS HEAT AFFECTED ZONE. Acta Metallurgica Slovaca, 28(3), 127–132. https://doi.org/10.36547/ams.28.3.1535