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金属学报    DOI: 10.11900/0412.1961.2014.00285
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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性能
赵霞1,查向东2,张龙3,梁田3,马颖澈2,刘奎2
1. 东北大学
2. 中国科学院金属研究所
3. 金属研究所
MICROSTRUCTURE AND PROPERTIES OF WELDING JOINT OF A NEW CORROSION-RESISTING NICKEL-BASED ALLOY AND 625 ALLOY DISSIMILAR METAL WELDING
全文: PDF(895 KB)  
摘要: 通过对一种新型镍基耐蚀合金U26-2#与625合金手工氩弧焊接接头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,U26-2#/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。U26-2#合金一侧熔合区组织过度良好,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U26-2#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维氏硬度值降低。U26-2#/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。
Abstract:Wastewater treatment, especially the industrial wastewater, organic matter difficult to decompose in city life waste water and sludge treatment, become a difficult problem in the sewage treatment technology. 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, we have investigated the microstructure and mechanical properties of the welding joint of the new alloy and 625 alloy with manual argon arc welding. Through microscope, SEM and EDX, we have analyzed the microstructure and fracture morphologies of the welding joint and performed the detailed analysis of the micro-hardness, tensile strength and other mechanical properties. The results indicated that there were more isometric crystals in remelting zone to improve the welding seam strength and the microstructure in fusion zone of U26-2# side does 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 2 thermal cycles near the remelting zone, the grains of heat affect zone (HAZ) were easy to grow. But the thermal stability of U26-2# side HAZ can reach excellent level. Fine grains of 625 parent material lead to grains growth seriously in HAZ, which reduced its Vickers hardness. Because of the tensile strength of welding joints of room temperature and 500 ℃ is lower than the parent materials, the welding seam could be the weakest link. The tesile fracture of U26-2#/625 dissimilar metal welding joint is dimple morphology.
收稿日期: 2014-05-28     
ZTFLH:  TG142.1  
通讯作者: 赵霞   

引用本文:

赵霞 查向东 张龙 梁田 马颖澈 刘奎. 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性能[J]. 金属学报, 10.11900/0412.1961.2014.00285.

链接本文:

https://www.ams.org.cn/CN/Y0/V/I/0

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