Inconel 718合金中δ相溶解动力学及对缺口敏感性的影响  

Dissolution Kinetics of δ Phase and Effect on Notch Sensitivity of Inconel 718

作　　者：蔡大勇[1] 张伟红[1] 刘文昌[1] 肖福仁[1] 姚枚[1] 孙贵东 陈宗霖 王少刚 

机构地区：[1]燕山大学材料科学与工程学院,河北秦皇岛060004 [2]黎明航发集团公司,沈阳110043

出　　处：《有色金属》2003年第1期4-7,共4页Nonferrous Metals

基　　金：国家自然科学基金资助项目 (5 99710 39)

摘　　要：通过X -射线衍射及高温持久试验研究Inconel 718中δ相在不同温度下溶解的动力学过程 ,以及δ相含量对缺口敏感性的影响。结果表明 ,在 980 ,10 0 0和 10 2 0℃保温过程中 ,δ相含量逐渐降低。 10 2 0℃保温 2h后δ相可完全溶入基体 ,980℃保温 30min、10 0 0℃保温 2h后δ相趋于平衡含量 3%和 0 6%。保温开始阶段 ,δ相的溶解速度较快且近似为常数 ,随着时间延长 ,溶解速度降低。δ相含量在 0 62 %～ 2 98% ,合金无缺口敏感性 ,含量低于 0 43%时导致缺口敏感。 10 0The dissolution kinetics of δ phase at different temperatures and effect of the content on the notch sensitivity of Inconel 718 are investigated by X ray diffraction and high temperature rupture life test The results show that the δ phase content decreases gradually with the retention time at 980,1000 and 1020℃ And the δ phase is completely dissolved into the austenitic matrix at 1020℃ for more than 2 hours A dynamic equilibrium state will be approached at 980℃ for more than 30 minutes and at 1000℃ for more than 2 hours,and the equilibrium content of δ phase are about 3% and 0 6% respectively There dissolution rate is high and nearly constant at the beginning stage of dissolution process, and then decreased gradually with the increase of retention time There is no notch sensitivity of the alloy with the δ phase content range from 0 62% to 2 98%, instead of seriously notch sensitivity with the content below 0 43% Optimum high temperature stress rupture property can be obtained at the dissolution treatment of 1000℃

关 键 词：材料科学基础 INCONEL718 Δ相 溶解动力学 缺口敏感性 

分 类 号：TG132.32[一般工业技术—材料科学与工程] TG146.15[金属学及工艺—合金]