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。
The structure and mechanical properties of 960- 1 020 ℃ 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 1 000 ℃, and the amount of strengthening phases γ＇ ＋ γ＇ increased until 1 000 ℃ then decreased. After solid solution ＋ double aging, the size of most of γ＇ was 10 - 18 nm.
出处
《特殊钢》
北大核心
2007年第3期19-21,共3页
Special Steel
