Nitrogen Addition to the Shielding Gas for Welding Hyper-duplex Stainless Steel

IF 0.3 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Soldagem & Inspecao Pub Date : 2020-01-01 DOI:10.1590/0104-9224/si25.12

A. Pimenta, M. Diniz, G. Perez, I. Solórzano-Naranjo

{"title":"Nitrogen Addition to the Shielding Gas for Welding Hyper-duplex Stainless Steel","authors":"A. Pimenta, M. Diniz, G. Perez, I. Solórzano-Naranjo","doi":"10.1590/0104-9224/si25.12","DOIUrl":null,"url":null,"abstract":"In the present work we have studied the effects of nitrogen addition on the equilibrium of the volume fraction ratio austenite/ferrite and on the structural properties of weldments produced by gas tungsten arc welding (GTAW). The welded joints in tubes UNS S32707 of hyper-duplex steel were produced using argon and nitrogen gas welding, with nitrogen added in ratios of 1.5, 2.5, 3.5, 4.5, and 5.5%. Microstructural characterization of this material under the different processing condition was conducted by means of optical microscopy, scanning electron microscopy, local chemical analysis by X-ray energy dispersive spectroscopy, electron backscatter diffraction Vickers microhardness test, and digital image processing. All welding conditions resulted in welded joints with equiaxial grains microstructure containing austenite both at the boundaries and in the ferrite matrix. Microhardness measurements did not show significant variation in relation to the base metal. The use of welding gases with higher percentages of nitrogen resulted in increases in the austenite volume fraction in the order of 39 to 57% when considering the nitrogen content ranging from 1.5 to 5.5%. Key-words: Hyper-duplex stainless steel; GTAW; Nitrogen addition; EBSD; Microstructural characterization.","PeriodicalId":49500,"journal":{"name":"Soldagem & Inspecao","volume":"140 1","pages":""},"PeriodicalIF":0.3000,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"8","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Soldagem & Inspecao","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1590/0104-9224/si25.12","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}

引用次数: 8

Abstract

In the present work we have studied the effects of nitrogen addition on the equilibrium of the volume fraction ratio austenite/ferrite and on the structural properties of weldments produced by gas tungsten arc welding (GTAW). The welded joints in tubes UNS S32707 of hyper-duplex steel were produced using argon and nitrogen gas welding, with nitrogen added in ratios of 1.5, 2.5, 3.5, 4.5, and 5.5%. Microstructural characterization of this material under the different processing condition was conducted by means of optical microscopy, scanning electron microscopy, local chemical analysis by X-ray energy dispersive spectroscopy, electron backscatter diffraction Vickers microhardness test, and digital image processing. All welding conditions resulted in welded joints with equiaxial grains microstructure containing austenite both at the boundaries and in the ferrite matrix. Microhardness measurements did not show significant variation in relation to the base metal. The use of welding gases with higher percentages of nitrogen resulted in increases in the austenite volume fraction in the order of 39 to 57% when considering the nitrogen content ranging from 1.5 to 5.5%. Key-words: Hyper-duplex stainless steel; GTAW; Nitrogen addition; EBSD; Microstructural characterization.

查看原文本刊更多论文

超双相不锈钢焊接保护气体中添加氮气的研究

本文研究了氮的加入对奥氏体/铁素体体积分数比平衡和钨极气体保护焊焊缝组织性能的影响。采用氩气和氮气焊接工艺，分别添加1.5、2.5、3.5、4.5和5.5%的氮气，制备了UNS S32707超双相钢管的焊接接头。通过光学显微镜、扫描电镜、x射线能谱局部化学分析、电子背散射衍射维氏显微硬度测试和数字图像处理等手段对该材料在不同加工条件下的微观结构进行表征。所有焊接条件均导致焊接接头具有等轴晶组织，其边界和铁素体基体中均含有奥氏体。显微硬度测量没有显示出与母材相关的显著变化。在含氮量为1.5 ~ 5.5%的情况下，使用含氮量较高的焊接气体可使奥氏体体积分数提高39% ~ 57%。关键词:超双相不锈钢;GTAW;氮添加;EBSD;微观结构表征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Soldagem & Inspecao 工程技术-冶金工程

CiteScore

1.00

自引率

16.70%

发文量

审稿时长

12 weeks

期刊介绍： The Journal Soldagem & Inspeção (S&I) js a techno-scientific journal created in 1995. Printed issues of this journal are distributed free of charge to libraries in Brazil, Latin America and the Iberian Peninsula. It has been printed regularly every quarter since September, 2002, and, since the beginning of 2007, its electronic version is available in the address: (http://www.abs-soldagem.org.br/s&i/). The journal is sponsored by the Brazilian Welding Association (ABS). Since its creation several well known professionals working in welding contributed with the Journal Soldagem & Inspeção and its editorial board crosses the Brazilian borders. During its evolution the Journal received ta special contribution from the Editors-in-chief : Ronaldo Paranhos, Américo Scoti, Paulo Modenesi e Alexandre Bracarence. Since January 2012 the Editor-in-chief is Ana Sofia C. M. D’Oliveira, Full professor at Universidade Federal do Paraná (UFPR) . Her work focus mainly on Hardfacing and Physical Metallurgy. The jornal Soldagem & Inspeção also counts with 10 Associate Editors and a fix Editorial board of referees. short-term (Ad Hoc) referees can be invited to evaluate some papers submitted to the journal. The Soldagem & Inspeção journal is the scientific divulgation channel of the Brazilian Welding Association (ABS). It aims to publish original papers related to the scientific and technological development of welding, inspection, and related fields. Review papers or letters on current and controversial subjects are also published in the Journal. Its abbreviated title is Soldag. insp. (Impr.), which should be used in bibliographies, footnotes and bibliographical references and strips.