MICROSTRUCTURE AND MECHANICAL PROPERTIES OF THE WELDING JOINT OF A NEW CORROSION- RESISTING NICKEL-BASED ALLOY AND 304 AUSTENITIC STAINLESS STEEL

doi:10.11900/0412.1961.2014.00284

Acta Metall Sin

2014, Vol. 50

Issue (11): 1335-1342 DOI: 10.11900/0412.1961.2014.00284

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MICROSTRUCTURE AND MECHANICAL PROPERTIES OF THE WELDING JOINT OF A NEW CORROSION- RESISTING NICKEL-BASED ALLOY AND 304 AUSTENITIC STAINLESS STEEL

ZHOU Feng^1,², ZHAO Xia^1,², ZHA Xiangdong², MA Yingche²(

), LIU Kui²

1 School of Materials and Metallurgy, Northeastern University, Shenyang 110819
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

ZHOU Feng, ZHAO Xia, ZHA Xiangdong, MA Yingche, LIU Kui. MICROSTRUCTURE AND MECHANICAL PROPERTIES OF THE WELDING JOINT OF A NEW CORROSION- RESISTING NICKEL-BASED ALLOY AND 304 AUSTENITIC STAINLESS STEEL. Acta Metall Sin, 2014, 50(11): 1335-1342.

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Abstract

With the fast development of industry, a serious global problem, pollution, becomes more apparent. A large number of wastewater is discharged, causing the environment pollution. Supercritical water oxidation (SCWO) becomes the most effective method to treat the wastewater within recent years, but the material used in the equipment plays a key role in restricting the application of the SCWO process. Currently, during the SCWO wastewater treatment process, 304 austenitic stainless steel, alloy 625, P91 and P92 steels are the mainly preheater and reactor materials. In order to reduce the serious corrosion and improve economic efficiency of the materials for this process, a new corrosion resistant Ni-based alloy (called X-2# alloy) has been developed with an aim of replacing the previous ones. In particular, it is highly important to the related behavior of this new alloy welding with the original SCWO. Therefore, the microstructure and mechanical properties of the welding joint of the new alloy and 304 austenitic stainless steel with manual argon arc welding were investigated. The microstructure and fracture morphologies of the welding joint were analyzed through OM, SEM and EDS, and the detailed analysis of the micro-hardness, tensile strength and other mechanical properties were performed. The results demonstrated that the parent material with the typical 40~65 mm grains size is helpful for dissimilar steel welding, and the microstructure in fusion zone of X-2# side does not show welding defects. However, some ferrites are further formed near the fusion zone of 304 stainless steel sides. There are Cr-rich and Ni-poor distributions in the ferrites. The grain grows seriously in both the areas near the remelt zone and 304 stainless steel side of heat affected zones (HAZs), which affect heavily the performance of welding joint. In addition, the results also uncover that the Vickers-hardness is the minimum in the HAZ. At room temperature, the fracture location of the tensile tests of X-2#/304 is in the welding seam, whereas at 500 ℃ the corresponding position is in the 304 matrix. Due to the strengthening effects of Al, W and Mo elements, the high temperature mechanical properties of X-2# alloy have been found to be even better than those of the 304 austenitic stainless steel.

Key words: X-2#/304 welding joint welding seam fusion zone heat affected zone

Received: 06 August 2014

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	Feng ZHOU
	Xia ZHAO
	Xiangdong ZHA
	Yingche MA
	Kui LIU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00284 OR https://www.ams.org.cn/EN/Y2014/V50/I11/1335

Table 1 Chemical compositions of parent materials(mass fraction / %)

Fig.1 Position of welding joint for micro-hardness test

Fig.2 Geometry of the tensile specimen (unit: mm)

Fig.3 OM image of X-2#/304 dissimilar metal welding joint

Fig.4 OM images of parent materials

(a) X-2# alloy

(b) 304 austenitic stainless steel

Fig.5 OM images of X-2#/304 welding seam (a) and X-2#/304 welding remelting zone (b)

Fig.6 OM images of X-2# side (a) and 304 side (b) fusion zones on X-2#/304 welding joint

Fig.7 SEM images of precipitation (a) and matrix (b) on 304 side fusion zone, and corresponding EDS (c, d)

Fig.8 OM images of X-2# side (a) and 304 side (b) heat affected zone (HAZ) on X-2#/304 welding joint

Table 2 Comparison of precipitates and matrix elements

Fig.9 Distributions of micro-hardness of welding joints

(a) positive welding seam (b) negative welding seam

Fig.10 Fracture locations of welding joints under different temperatures

Fig.11 Macro-(a, b) and micro-(c, d) structures of tensile fracture of X-2#/304 welding joint under 20 ℃ (a, c) and 500 ℃ (b, d)

Table 3 Tensile properties under different temperatures

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