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首页> 外文期刊>International Journal of Minerals,Metallurgy and Materials >Development of gas tungsten arc welding using current pulsing technique to preclude chromium carbide precipitation in aerospace-grade alloy 80A
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Development of gas tungsten arc welding using current pulsing technique to preclude chromium carbide precipitation in aerospace-grade alloy 80A

机译：利用电流脉冲技术开发气体钨弧焊，抑制航空级合金80A中碳化铬沉淀

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摘要

Weldments were produced using gas tungsten arc welding (GTAW) and pulsed current gas tungsten arc welding (PCGTAW) techniques with ERNiCr-3 filler wire. Macro examination revealed that the resultant weldments were free from defects. A refined microstructure was observed in the weldment fabricated through PCGTAW. Scanning electron microscopy (SEM) analysis revealed secondary phases in the grain boundaries. Energy-dispersive X-ray spectroscopy (EDS) analysis revealed that microsegregation of Cr carbide precipitates was completely eradicated through PCGTAW. The microsegregation of Nb precipitates was observed in the GTA and PCGTA weldments. X-ray diffraction (XRD) analysis revealed the existence of M23C6 Cr-rich carbide and Ni8Nb phases in the GTA weldments. By contrast, in the PCGTA weldments, the Ni8Nb phase was observed. The Cr2Ti phase was observed in both the GTA and the PCGTA weldments. Tensile tests showed that the strength and ductility of the PCGTA weldments were slightly higher than those of the GTA weldments.
机译：使用煤气弧焊（GTAW）和脉冲电流汽油弧焊（PCGTAW）技术生产焊料，具有ERNICR-3填充丝。宏观检查显示，所得焊料不含缺陷。通过PCGTAW制造的焊接观察到精细的微结构。扫描电子显微镜（SEM）分析显示晶界中的二次相。能量分散X射线光谱（EDS）分析显示，通过PCGTAW完全消除Cr碳化物沉淀物的微量次测量。在GTA和PCGTA焊料中观察到Nb沉淀物的微量测定。 X射线衍射（XRD）分析显示，GTA焊料中的M23C6富含碳化物和Ni8NB相的存在。相比之下，在PCGTA焊料中，观察到Ni8NB相。在GTA和PCGTA焊料中观察到CR2TI相。拉伸试验表明，PCGTA焊料的强度和延展性略高于GTA焊料的强度和延展性。

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