An investigation of the effect of sensitization on the metallurgical characteristics of dissimilarly welded austenitic-ferritic stainless steel

IF 2.3 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Anti-corrosion Methods and Materials Pub Date : 2023-08-01 DOI:10.1108/acmm-04-2023-2797
Anand Sharma, Sourabh Shukla, Manish A. Thombre, Ankur V. Bansod, S. Untawale
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Abstract

Purpose The purpose of this study is to examine the effects of sensitization on the metallurgical characteristics of weld joints made up of austenitic stainless steel (AISI 316L) and ferritic stainless steel (AISI 430), using the gas tungsten arc welding (GTAW) process with ER316L filler wires. Design/methodology/approach A non-consumable tungsten electrode with a diameter of 1.6 mm was used during the GTAW procedure. The filler wire, ER316L, was selected based on the recommendation provided in literature. To explore the interconnections among the structure and properties of these weldments, the techniques including scanning electron microscopy and optical analysis have been used. In addition, the sensitization behaviour of the weldments was investigated using the double loop electrochemical potentio-kinetic reactivation (DLEPR) test. Findings Microstructural analyses revealed the occurrences of coarsened grains with equiaxed columnar grains and migrating grain boundaries in the weld zone. The results of the DLEPR test demonstrated that heat affected zone (HAZ) of AISI 430 was more susceptible to sensitization than HAZ of AISI 316L. Microstructure analysis also revealed the precipitation of large amounts of chromium carbide at the grain boundaries region of AISI 430 welded steel, causing more sensitization and, as a result, more failure or breaking at the side of AISI 430 weld in the dissimilar weldment of AISI 316L–AISI 430. Originality/value The present work has been carried out to determine the appropriate welding conditions for joining AISI 316L and AISI 430, as well as the metallurgical properties of the dissimilar weldment formed between AISI 316L and AISI 430. Owing to the difficulties in measuring the performance of these types of dissimilar joints given their unique mechanical and microstructural characteristics, research on the subject is limited.
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敏化对不同焊接奥氏体-铁素体不锈钢冶金特性影响的研究
目的研究增敏剂对奥氏体不锈钢(AISI 316L)与铁素体不锈钢(AISI 430)在ER316L填充焊丝下钨极气体保护焊(GTAW)焊接接头冶金性能的影响。设计/方法/方法在GTAW过程中使用直径为1.6 mm的非消耗性钨电极。根据文献推荐,选择填充丝ER316L。为了探究这些焊接件的结构和性能之间的相互关系,使用了扫描电镜和光学分析等技术。此外,采用双回路电化学电位-动力学再激活(DLEPR)试验研究了焊缝的敏化行为。显微组织分析表明,焊缝区出现了粗化晶粒、等轴柱状晶粒和迁移晶界。DLEPR试验结果表明,AISI 430的热影响区(HAZ)比AISI 316L的热影响区更容易敏化。显微组织分析还发现,在AISI 316L-AISI 430异种焊件中,AISI 430焊接钢的晶界区析出大量碳化铬,造成了更多的敏化作用,从而导致AISI 430焊缝侧出现更多的失效或断裂。本工作旨在确定AISI 316L与AISI 430的焊接条件,以及AISI 316L与AISI 430之间形成的异种焊件的冶金性能。由于这些类型的异种接头具有独特的力学和微观结构特征,因此难以测量其性能,因此对该主题的研究受到限制。
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来源期刊
Anti-corrosion Methods and Materials
Anti-corrosion Methods and Materials 工程技术-冶金工程
CiteScore
2.80
自引率
16.70%
发文量
61
审稿时长
13.5 months
期刊介绍: Anti-Corrosion Methods and Materials publishes a broad coverage of the materials and techniques employed in corrosion prevention. Coverage is essentially of a practical nature and designed to be of material benefit to those working in the field. Proven applications are covered together with company news and new product information. Anti-Corrosion Methods and Materials now also includes research articles that reflect the most interesting and strategically important research and development activities from around the world. Every year, industry pays a massive and rising cost for its corrosion problems. Research and development into new materials, processes and initiatives to combat this loss is increasing, and new findings are constantly coming to light which can help to beat corrosion problems throughout industry. This journal uniquely focuses on these exciting developments to make essential reading for anyone aiming to regain profits lost through corrosion difficulties. • New methods, materials and software • New developments in research and industry • Stainless steels • Protection of structural steelwork • Industry update, conference news, dates and events • Environmental issues • Health & safety, including EC regulations • Corrosion monitoring and plant health assessment • The latest equipment and processes • Corrosion cost and corrosion risk management.
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