Abstract: The structure and mechanical properties of 960～1020 ℃ solid solution treated + 720 ℃ 8 h furnace cooling to 620 ℃8 h air cooling double aging modified 718 alloy have been studied by X- ray diffraction(XRD)and scanning electron microscope(SEM).Results showed that with increasing solid solution temperature the ambient and 350 ℃ strength of alloy decreased,while plasticity and toughness increased; with increasing solid solution temperature, the amount of strengthening phase η in alloy decreased and disappeared at 1000 ℃,and the amount of strengthening phases γ'+γ" increased until 1000 ℃ then decreased. After solid solution + double aging,the size of most of γ' was 10~18 nm.

Key words: Modified Inconel 718 Alloy,Solid Solution Temperature,Structure,Properties

摘要： 用X-射线衍射法(XRD)和扫描电镜(SEM)研究了960～1020℃固溶+720℃8 h炉冷至620℃8 h空冷(二次时效)处理的改型718合金的力学性能和组织。结果表明,随固溶温度的提高。合金室温和350℃强度降低,塑性和韧性显著提高。随固溶温度升高,合金中强化相η数量减少,1000℃时完全消失;强化相γ′+γ″随固溶温度升高而增加,达到1000℃时最多。固溶+二次时效后,大部分γ′尺寸为10～18 nm。

关键词: 改型Inconel 718合金, 固溶温度, 组织, 性能