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研究了617合金在760℃时效过程中组织结构变化及其对力学性能的影响。结果表明,合金在760℃时效过程中,析出相有M23C6碳化物和γ′-Ni3(Al,Ti);γ′分布于晶内,M23C6分布于晶内和晶界。整个时效过程中,晶内γ′和M23C6稳定性好。晶界M23C6碳化物在时效初期(≤1000h)稳定性好。合金时效300h后,硬度和强度明显增大;时效1000h后达到最大值,这是晶界、晶内协调强化的结果;时效3000h后,晶界M23C6颗粒聚集长大,弱化了晶界强化和Mo的固溶强化作用,从而降低了强度和硬度。时效后,室温冲击吸收能量和断后伸长率明显降低是由于晶界析出M23C6碳化物弱化界面结合强度。
The microstructure and mechanical properties of 617 alloy during aging at 760 ℃ were studied. The results show that M23C6 carbides and γ’-Ni3 (Al, Ti) are precipitated in the alloy during aging at 760 ℃. Γ ’is distributed in the crystal and M23C6 is distributed in the crystal and grain boundaries. Throughout the aging process, the crystal γ ’and M23C6 stability. Grain boundary M23C6 carbide early aging (≤ 1000h) good stability. After aging for 300h, the hardness and strength of the alloy increased obviously, reaching the maximum value after aging for 1000h, which was the result of the coordination strengthening in the grain boundary and intragranular. After aging for 3000h, the grain boundary M23C6 aggregated and grew, weakening the grain boundary strengthening and Mo Solid solution strengthening effect, thereby reducing the strength and hardness. After aging, the impact energy absorption at room temperature and elongation after fracture is obviously reduced due to grain boundary precipitation M23C6 carbide weakening interface bonding strength.