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研究了IN 617合金在760℃时效过程中组织结构与室温冲击和拉伸性能的关系,并借助扫描电镜和透射电镜对合金时效过程中的微观结构、室温冲击及拉伸断口进行了观察与分析.结果表明:在IN 617合金时效后,主要析出相为M23C6碳化物;晶界M23C6碳化物对强度和塑性、冲击吸收能量的作用是:一方面,它阻碍晶界滑移,起到强化作用,从而提高了合金强度;另一方面,它导致界面结合强度降低,晶界成为断裂的发源地,从而引起冲击吸收能量和塑性降低;合金时效后,断裂模式由塑性断裂转变为脆性断裂.
The relationship between microstructure and room temperature impact and tensile properties of IN 617 alloy at 760 ℃ was studied. The microstructure, room temperature impact and tensile fracture of alloy IN 617 were observed and analyzed by SEM and TEM The results show that the main precipitation phase is M23C6 carbide after IN 617 alloy aging. The effect of grain boundary M23C6 carbides on the strength, ductility and impact energy absorption is that on the one hand, it hinders the grain boundary sliding and plays a strengthening role , Which increases the strength of the alloy. On the other hand, it decreases the bonding strength of the interface and the grain boundary becomes the cradle of the rupture, resulting in the decrease of the energy and the ductility of shock absorption. The rupture mode changes from plastic to brittle fracture after aging.