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首页> 外文期刊>Journal of Materials Engineering and Performance >Analysis of Formation and Interfacial WC Dissolution Behavior of WC-Co/Invar Laser-TIG Welded Joints
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Analysis of Formation and Interfacial WC Dissolution Behavior of WC-Co/Invar Laser-TIG Welded Joints

机译：WC-Co / Invar Laser-TIG焊接接头的形成及界面WC溶解行为的分析

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摘要

During the valve fabrication, hard metal is welded to stainless steel or invar alloy for sealing purposes because of its good heat resistance operating at 500℃. However, WC (tungsten carbide) dissolution in weld pool softens the hard metal and decreases mechanical properties near the hard metal/weld interface. In order to analyze the WC dissolution in welded joint, joining of hard metal and invar alloy was carried out using laser-tungsten inert gas hybrid welding method. Microstructures of the weld region, chemical composition were investigated using optical microscope, scanning electron microscopy, and EDAX, respectively. Mechanical properties such as microhardness and four-point bend strength test were performed. Larger and smaller WC dissolution and WC dissolution through transition layer based on thermo-dynamics were discussed. The results thus indicate that WC dissolution led to cellular microstructure, columnar crystal, and transition layer under the effect of laser beam and tungsten arc. WC dissolution was affected by metal ions Fe~+, Ni~+, Co~+ exchange in W-M-C system, and WC grain growth was driven by forces caused by laser beam and tungsten arc in larger WC, smaller WC, and liquid Fe, Ni systems.
机译：在阀门制造过程中，硬金属由于在500℃的高温下具有良好的耐热性而被焊接到不锈钢或殷钢合金上以进行密封。但是，焊缝中的WC（碳化钨）溶解会软化硬质金属并降低硬质金属/焊接界面附近的机械性能。为了分析WC在焊接接头中的溶解，采用激光-钨极惰性气体混合焊接法进行了硬质合金和殷钢合金的结合。分别使用光学显微镜，扫描电子显微镜和EDAX对焊缝区域的微观结构，化学成分进行了研究。进行了诸如显微硬度和四点弯曲强度测试的机械性能。讨论了基于热力学的较大和较小的WC溶解度和通过过渡层的WC溶解度。因此，结果表明，在激光束和钨弧的作用下，WC的溶解导致了细胞微结构，柱状晶体和过渡层的形成。在WMC系统中，WC的溶解受金属离子Fe〜+，Ni〜+，Co〜+交换的影响，在较大的WC，较小的WC和液态的Fe，Ni中，激光束和钨弧产生的力驱动WC晶粒的生长系统。

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