Influence of Ni and PWHT on microstructure evolution and mechanical properties of GTA-welded duplex stainless steel and super duplex stainless steel joints: A comparative investigation

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Mahmoud Abbasi, Behrouz Bagheri Vanani, Ali Tahaei, Gian Luca Garagnani
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Abstract

In the present investigation, a new endeavor has been made to analyze the impact of the secondary process (post-weld heat treatment (PWHT)) as well as Ni addition on the microstructure and mechanical characteristics of welds. Welds between similar joining materials from duplex stainless steels (DSS), as well as super DSS (SDSS), were made by the gas tungsten arc welding (GTAW) process. For DSS, after PWHT with the addition of Ni element, the amount of austenite rises and becomes more uniformly distributed with curved boundaries, while for SDSS, the microstructure mainly consists of intergranular and Widmanstätten austenite. According to the comparison of phase percentages obtained based on both ASTM E1245 and ASTM E562, a good balance between ferrite and austenite phases of joint materials was achieved. X-ray diffraction analyses on both joints revealed that phases are mainly ferrite and austenite with different lattice parameters without evidence of unwanted intermetallic phases. The addition of Ni increases the hardness values of DSS weld metal compared to the base metal due to an increased amount of Widmanstätten austenite and ferrite in the microstructure. The lowest ductility was obtained for the SDSS weld sample with the addition of Ni and PWHT because of the existence of secondary austenite in the weld metal and the Widmanstätten morphology of the austenite. The effect of PWHT on the development of microstructure and mechanical behaviors was more than the effect of nickel powder on weld samples.
镍和 PWHT 对 GTA 焊接双相不锈钢和超级双相不锈钢接头微观结构演变和机械性能的影响:对比研究
本研究试图分析二次加工(焊后热处理 (PWHT))和镍添加对焊缝微观结构和机械特性的影响。双相不锈钢(DSS)和超级双相不锈钢(SDSS)的类似连接材料之间的焊缝是通过气体钨极氩弧焊(GTAW)工艺制成的。对于双相不锈钢,在添加了镍元素的 PWHT 后,奥氏体的数量增加,并变得更加均匀地分布在弯曲的边界上,而对于 SDSS,微观结构主要由晶间奥氏体和维德曼斯泰滕奥氏体组成。根据 ASTM E1245 和 ASTM E562 得出的相百分比比较,接头材料的铁素体和奥氏体相之间达到了良好的平衡。对两种接头进行的 X 射线衍射分析表明,两相主要是具有不同晶格参数的铁素体和奥氏体,没有发现不需要的金属间相。与母材相比,添加镍会增加 DSS 焊接金属的硬度值,这是因为微观结构中的维德曼施塔特奥氏体和铁素体数量增加了。由于焊缝金属中存在二次奥氏体以及奥氏体的维德曼施塔特形态,添加 Ni 和 PWHT 的 SDSS 焊缝样品获得了最低的延展性。PWHT 对微观结构和机械性能发展的影响大于镍粉对焊接样品的影响。
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来源期刊
CiteScore
4.70
自引率
8.30%
发文量
166
审稿时长
3 months
期刊介绍: The Journal of Materials: Design and Applications covers the usage and design of materials for application in an engineering context. The materials covered include metals, ceramics, and composites, as well as engineering polymers. "The Journal of Materials Design and Applications is dedicated to publishing papers of the highest quality, in a timely fashion, covering a variety of important areas in materials technology. The Journal''s publishers have a wealth of publishing expertise and ensure that authors are given exemplary service. Every attention is given to publishing the papers as quickly as possible. The Journal has an excellent international reputation, with a corresponding international Editorial Board from a large number of different materials areas and disciplines advising the Editor." Professor Bill Banks - University of Strathclyde, UK This journal is a member of the Committee on Publication Ethics (COPE).
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