Mechanism of crack formation of the butt joint between UMCo50A and Inconel 600

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-16 DOI:10.1016/j.matchar.2025.115061

Haitao Xue , Wenjie Mu , Yang Jia , Zheng Wan , Weibing Guo , Cuixin Chen , Wenzhao Li , Yaojie Li

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引用次数: 0

Abstract

The burner nozzle serves as the core component in pressurized coal-water slurry gasification systems. During the butt welding process between the nozzle and a nickel-based alloy cooling water coil, cracks were observed in the Heat Affected Zone (HAZ) of the welded joint. To address technical and safety concerns in industrial applications, this study systematically investigated the crack formation mechanism through microstructural characterization. Results indicate that liquation cracks originate from partial liquefaction of M₂₃C₆ carbides along grain boundaries during the welding thermal cycle. The liquefied carbides combine with low-melting eutectic phases to form discontinuous liquid films at grain boundaries. As the material approaches its solidification temperature, these viscous liquid films exhibit limited fluidity. Subsequent welding tensile stresses induce liquid film decohesion from grain boundaries, ultimately generating microvoids that coalesce into macroscopic cracks.

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UMCo50A与Inconel 600对接接头裂纹形成机理

燃烧器喷嘴是水煤浆加压气化系统的核心部件。在喷嘴与镍基合金冷却水盘管对接焊接过程中，焊接接头热影响区出现裂纹。为了解决工业应用中的技术和安全问题，本研究通过微观结构表征系统地研究了裂纹的形成机制。结果表明，在焊接热循环过程中，M23C6碳化物沿晶界部分液化是液化裂纹的主要原因。液化的碳化物与低熔点共晶相结合，在晶界处形成不连续的液膜。当材料接近其凝固温度时，这些粘性液体膜表现出有限的流动性。随后的焊接拉伸应力诱导液膜从晶界析出，最终产生微孔洞并合并成宏观裂纹。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.