Microstructure and Properties of Dissimilar Metal Welded Joints of Low Alloy Steel and Duplex Stainless Steel

doi:10.11902/1005.4537.2021.047

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (2): 295-300 DOI: 10.11902/1005.4537.2021.047

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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

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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 words: dissimilar metal welding duplex stainless steel galvanic corrosion microstructure

Received: 10 March 2021

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51701102)

Corresponding Authors: WANG Liwei E-mail: ustbwangliwei@126.com

About author: WANG Liwei, E-mail: ustbwangliwei@126.com

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Cite this article:

DING Yi, WANG Liwei, LIU Deyun, WANG Xin. 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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.047 OR https://www.jcscp.org/EN/Y2022/V42/I2/295

Fig.1 Diagram of welded joint dimensions

Fig.2 Metallographic images of X80 steel (a), 2507SDSS (b) substrate, weld (c) and WM two-phase ratio (d)

Fig.3 OM (a, c) and SEM (b, d) images of WM/2507 SDSS (a, b) and WM/X80 steel interface (c, d) side transition region

Fig.4 EDS line scan results of the transition region on the WM/X80 side

Fig.5 HAZ metallographies of coarse-grained zone (a), fine-grained zone (b) and two-phase zone (c) of X80 steel

Fig.6 Microhardness distribution in transition zone of welded joint

Fig.7 Polarization curves of different areas of MIG welded joints in artificial seawater

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