一种新型镍基耐蚀合金与625合金异种金属焊接接头的组织和力学性能<sup>*</sup>

doi:10.11900/0412.1961.2014.00285

金属学报

2015, Vol. 51

Issue (2): 249-256 DOI: 10.11900/0412.1961.2014.00285

本期目录 | 过刊浏览

一种新型镍基耐蚀合金与625合金异种金属焊接接头的组织和力学性能^*

赵霞^1,², 查向东², 刘扬³, 张龙², 梁田², 马颖澈²(

), 程乐明³

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
3 新奥科技发展有限公司, 廊坊 065001

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A NEW CORROSION-RESISTING NICKEL-BASED ALLOY AND 625 ALLOY DISSIMILAR METAL WELDING JOINT

ZHAO Xia^1,², ZHA Xiangdong², LIU Yang³, ZHANG Long², LIANG Tian², MA Yingche²(

), CHENG Leming³

1 School of Materials and Metallurgy, Northeastern University, Shenyang 110819
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
3 ENN Science & Technology Development Co. Ltd., Langfang 065001

引用本文:

赵霞, 查向东, 刘扬, 张龙, 梁田, 马颖澈, 程乐明. 一种新型镍基耐蚀合金与625合金异种金属焊接接头的组织和力学性能^*[J]. 金属学报, 2015, 51(2): 249-256.
Xia ZHAO, Xiangdong ZHA, Yang LIU, Long ZHANG, Tian LIANG, Yingche MA, Leming CHENG. MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A NEW CORROSION-RESISTING NICKEL-BASED ALLOY AND 625 ALLOY DISSIMILAR METAL WELDING JOINT[J]. Acta Metall Sin, 2015, 51(2): 249-256.

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摘要:

对一种新型镍基耐蚀合金X-2#与625合金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分析等手段研究了焊接接头的组织和性能. 结果表明, X-2#/625异种金属焊接焊缝重熔区等轴晶组织增多, 有利于提高焊缝区强度. X-2#合金一侧熔合区组织过渡良好, 而625合金一侧晶界有NbC和Laves相析出, 影响材料的力学性能. 热影响区在靠近重熔区附近的晶粒由于受2次热循环的影响, 出现晶粒长大现象, 而X-2#合金一侧热影响区的热稳定性较好. 625合金母材晶粒细小导致其热影响区晶粒长大明显, 从而使625合金一侧热影响区的Vickers硬度值降低. X-2#/625焊接接头在室温到700 ℃下的抗拉强度均低于2侧母材, 焊缝区为接头最薄弱环节, 断口形貌均为韧窝状的韧性断口。

关键词 ： X-2#/625焊接接头, 焊缝区, 熔合区, 热影响区

Abstract：

With the fast development of industry, pollution becomes a very serious problem. The industrial and life wastewater are discharged and cause the environment pollution. Supercritical water oxidation (SCWO) becomes the most effective method to treat the wastewater. 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 main 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 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 alloy 625 with manual argon arc welding were investigated. The microstructure and fracture morphologies of the welding joint were analyzed by OM, SEM and EDX. The micro-hardness, tensile strength and other mechanical properties were tested and analyzed. The results indicated that more isometric crystals in remelting zone to improve the welding seam strength and the microstructure in fusion zone of X-2# side did not show welding defects. However, some NbC and Laves phases formed near the fusion zone of 625 alloy sides, which affected the mechanical properties of material. Due to the influence of two thermal cycles near the remelting zone, the grains of heat affected zone (HAZ) were easy to grow. But the thermal stability of X-2# side HAZ could reach excellent level. Fine grains of 625 parent material led to grain growth seriously in HAZ, which reduced its Vickers hardness. Because of the tensile strength of welding joints of room temperature and 500 ℃ was lower than the parent materials, the welding seam could be the weakest link. The tesile fracture of X-2#/625 dissimilar metal welding joint was dimple morphology。

Key words： X-2#/625 welding joint welding seam fusion zone heat affected zone

收稿日期: 2014-05-27

ZTFLH:

TG142.1

作者简介: null

作者简介: 赵霞, 女, 1989年生, 硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00285 或 https://www.ams.org.cn/CN/Y2015/V51/I2/249

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#/625异种金属焊接接头母材的显微组织

图4 X-2#/625异种金属焊接接头焊缝区的显微组织

图5 X-2#/625异种金属焊接接头熔合区显微组织的OM像和析出物的SEM像

图6 625合金一侧熔合区析出物的SEM像和EDS分析

图7 X-2#/625异种金属焊接接头热影响区的显微组织

图8 X-2#/625异种金属焊接接头的显微硬度分布

表2 X-2#/625 异种金属焊接接头在不同温度进行拉伸实验后的力学性能

图9 X-2#/625异种金属焊接接头在不同温度进行拉伸实验后的宏观形貌

图10 X-2#/625 异种金属焊接接头在20和500 ℃进行拉伸实验后的断口形貌

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