Abstract The room/high temperature mechanical property of the Inconel 617B joined by multi-layer narrow gap tungsten arc welding technology (NG-TIG) is investigated, and thermal simulation is utilized to reveal the behavior of M23C6 phase in Inconel 617B superalloy during welding. Eutectic microstructures and micro fissures resulting from constitutional liquation due to thermal exposure in welding occur in the heat affected zone (HAZ), which leads to slight softening in the HAZ after welding. Room/high temperature tensile tests show that little adverse effects on the mechanical strength of joint has been caused by the welding process. It is shown by the thermal simulation that constitutional liquation of this micro-scale M23C6 carbides would occur when the peak temperature (Tp) reached 1300 ℃. The behavior of the micro-sized M23C6 in multi-layer welding cycle could be described as: M23C6 + (γ-Ni) → liquid → M23C6 + γ-Ni → M23C6 + γ-Ni + secondary M23C6.

中文翻译：

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Inconel 617B高温合金中M 23 C 6 相在焊接过程中的行为

摘要 研究了多层窄间隙钨极电弧焊（NG-TIG）焊接Inconel 617B的室温/高温力学性能，并利用热模拟揭示了Inconel 617B高温合金中M23C6相在焊接过程中的行为。在热影响区（HAZ）中由于焊接中的热暴露引起的结构液化导致的共晶微观结构和微裂纹发生在热影响区（HAZ），这导致焊接后热影响区的轻微软化。室温/高温拉伸试验表明，焊接过程对接头的机械强度几乎没有不利影响。热模拟表明，当峰值温度(Tp)达到1300 ℃时，这种微尺度M23C6碳化物发生结构液化。