一种新型镍基耐蚀合金与304奥氏体不锈钢异种金属焊接接头的组织和力学性能

doi:10.11900/0412.1961.2014.00284

金属学报

2014, Vol. 50

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

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一种新型镍基耐蚀合金与304奥氏体不锈钢异种金属焊接接头的组织和力学性能

周峰^1,², 赵霞^1,², 查向东², 马颖澈²(

), 刘奎²

1 东北大学材料与冶金学院, 沈阳 110819
2 中国科学院金属研究所, 沈阳 110016

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

引用本文:

周峰, 赵霞, 查向东, 马颖澈, 刘奎. 一种新型镍基耐蚀合金与304奥氏体不锈钢异种金属焊接接头的组织和力学性能[J]. 金属学报, 2014, 50(11): 1335-1342.
Feng ZHOU, Xia ZHAO, Xiangdong ZHA, Yingche MA, Kui LIU. MICROSTRUCTURE AND MECHANICAL PROPERTIES OF THE WELDING JOINT OF A NEW CORROSION- RESISTING NICKEL-BASED ALLOY AND 304 AUSTENITIC STAINLESS STEEL[J]. Acta Metall Sin, 2014, 50(11): 1335-1342.

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摘要:

对一种新型镍基耐蚀合金(X-2#)与304奥氏体不锈钢手工氩弧焊接接头进行拉伸性能和硬度的测试, 并结合OM, SEM和EDS等手段, 系统研究了焊接接头的组织和力学性能. 结果表明, X-2#/304异种金属焊接母材晶粒尺寸为40~65 mm, 有利于异种钢的焊接; X-2#合金一侧熔合区未发现焊接缺陷, 而304奥氏体不锈钢一侧有铁素体析出, 铁素体中富Cr贫Ni; 重熔区附近与靠304奥氏体不锈钢一侧的热影响区晶粒长大严重. X-2#/304异种金属焊接接头热影响区的Vickers硬度最小. X-2#/304焊接接头室温拉伸断裂位置在焊缝区, 而高温拉伸断裂位置在304奥氏体不锈钢基体. 由于Al, W和Mo元素的强化作用, X-2#合金的高温力学性能优于304奥氏体不锈钢.

关键词 ： X-2#/304焊接接头, 焊缝区, 熔合区, 热影响区

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

收稿日期: 2014-08-06

ZTFLH:

TG142.1

作者简介: null

周峰, 男, 1974年生, 博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00284 或 https://www.ams.org.cn/CN/Y2014/V50/I11/1335

表1 母材的化学成分

图1 焊接接头显微硬度测试位置示意图

图2 拉伸试样尺寸示意图

图3 X-2#/304异种金属焊接接头低倍组织

图4 母材显微组织

图5 焊缝区显微组织

图6 熔合区显微组织

图7 304奥氏体不锈钢一侧熔合区析出物的SEM像和EDS分析

图8 X-2#/304焊接接头热影响区显微组织

表2 析出物与基体元素含量对比表

图9 焊接接头显微硬度分布

图10 焊接接头在不同温度下拉伸实验的断裂位置

图11 X-2#/304焊接接头拉伸断口的宏观和微观形貌

表3 不同温度下的拉伸性能

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