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

IF 1.1 Q3 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Slovaca Pub Date : 2022-09-24 DOI:10.36547/ams.28.3.1535

G. Stornelli, Matteo Gaggiotti, D. Gattia, R. Schmidt, Mirko Sgambetterra, Anastasiya Tselikova, G. Zucca, A. Schino

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引用次数: 4

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.

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S355结构钢中钒合金化对焊接接头热影响区残余奥氏体形成的影响

在高强度微合金钢（HSLA）的焊接中，临界热影响区（ICHAZ）是最脆的部分之一。在Ac1和Ac3之间的温度范围内进行多次加热循环后，ICHAZ经历了强烈的韧性和抗疲劳性损失，这主要是由马氏体-奥氏体成分（MA）的形成引起的。HSLA钢中微合金元素的存在会导致一些微观结构成分的形成发生变化，这或多或少是有益的，这有助于提高焊接接头的机械性能。本文报道了添加0.1wt%V的S355级钢在临界区的行为。使用膨胀计模拟了五次双道次焊接热循环，临界区二次峰的最高温度在720°C至790°C之间。分析了残余奥氏体对临界温度的依赖性，并与硬度行为有关。

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