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中国腐蚀与防护学报  2022, Vol. 42 Issue (2): 295-300    DOI: 10.11902/1005.4537.2021.047
  研究报告 本期目录 | 过刊浏览 |
低合金钢与双相不锈钢异种金属焊接接头组织和性能的研究
丁奕1, 王力伟2(), 刘德运1, 王昕1
1.中国海洋大学材料科学与工程学院 青岛 266100
2.青岛大学机电工程学院 青岛 266071
Microstructure and Properties of Dissimilar Metal Welded Joints of Low Alloy Steel and Duplex Stainless Steel
DING Yi1, WANG Liwei2(), LIU Deyun1, WANG Xin1
1.School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
2.College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, China
全文: PDF(10879 KB)   HTML
摘要: 

采用2507超级双相不锈钢 (2507SDSS)、X80管线钢作为基材,使用熔化极气体保护焊 (MIG) 技术,制备了2507 SDSS/X80异种金属焊接接头。对异种金属焊接接头不同区域的微观组织结构进行表征,分析焊接接头的组织和性能。结果表明,在熔合界面与II型界面之间存在明显的Fe、Cr、Ni、Mo、Mn浓度梯度,稀释区具有最高的硬度。X80钢与焊缝金属构成电偶腐蚀,将加速低碳钢的腐蚀,是工业应用中的薄弱环节。

关键词 异种金属焊接双相不锈钢电偶腐蚀显微结构    
Abstract

Dissimilar metal welded joints of 2507 super duplex stainless steel (2507SDSS/X80) were prepared via metal inert gas welding (MIG) technology with 2507SDSS and X80 pipeline steel as raw and processed materials. The microstructure and properties of dissimilar metal welded joints were assessed by means of optical microscopy, SEM with EDS and microhardness tester, as well as electrochemical test in artificial seawater. Results show that obvious concentration gradients of Fe, Cr, Ni, Mo and Mn could be detected in the area between the fusion line and Type-II interface. The dilution zone has the highest hardness. Galvanic corrosion emerges for the couple of X80 steel and weld metal. In general, MIG welding filler ER2594 is suitable for welding the dissimilar metals of 2507SDSS super duplex stainless steel and low alloy in practical application.

Key wordsdissimilar metal welding    duplex stainless steel    galvanic corrosion    microstructure
收稿日期: 2021-03-10     
ZTFLH:  TG172  
基金资助:国家自然科学基金(51701102)
通讯作者: 王力伟     E-mail: ustbwangliwei@126.com
Corresponding author: WANG Liwei     E-mail: ustbwangliwei@126.com
作者简介: 丁奕,男,1995年生,硕士生

引用本文:

丁奕, 王力伟, 刘德运, 王昕. 低合金钢与双相不锈钢异种金属焊接接头组织和性能的研究[J]. 中国腐蚀与防护学报, 2022, 42(2): 295-300.
Yi DING, Liwei WANG, Deyun LIU, Xin WANG. Microstructure and Properties of Dissimilar Metal Welded Joints of Low Alloy Steel and Duplex Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 295-300.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.047      或      https://www.jcscp.org/CN/Y2022/V42/I2/295

图1  焊接接头尺寸示意图
图2  X80钢和2507SDSS基材及焊缝金相组织图
图3  焊接接头WM/2507 SDSS及WM/X80钢侧过渡区域组织
图4  WM/X80侧过渡区域EDS线扫描结果
图5  X80钢热影响区金相形貌
图6  焊接接头过渡区域显微硬度分布
图7  MIG焊接接头不同区域在人工海水环境中的极化曲线
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