TY - JOUR AU - Stornelli, Giulia AU - Gaggiotti, Matteo AU - Gattia, Daniele Mirabile AU - Schmidt, Rolf AU - Sgambetterra, Mirko AU - Tselikova, Anastasiya AU - Zucca, Guido AU - Schino, Andrea Di PY - 2022/09/24 Y2 - 2024/03/28 TI - VANADIUM ALLOYING IN S355 STRUCTURAL STEEL: EFFECT ON RESIDUAL AUSTENITE FORMATION IN WELDED JOINTS HEAT AFFECTED ZONE JF - Acta Metallurgica Slovaca JA - Acta Metall Slovaca VL - 28 IS - 3 SE - Research papers DO - 10.36547/ams.28.3.1535 UR - https://journals.scicell.org/index.php/AMS/article/view/1535 SP - 127-132 AB - <p>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 Ac<sub>1</sub> and Ac<sub>3</sub>, 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. &nbsp;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.</p> ER -