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

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research 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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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.