变形参数对Delta工艺Inconel 718合金中δ相的影响研究
Influence of Hot Deformation Parameters on δ Phase in Delta-processed Inconel 718 Alloy
何 毅1, 赵玉涛1, 王安东1, 缪 栋2
点击：3262次 下载：0次
作者单位：(1. 江苏大学 材料科学与工程学院, 江苏 镇江 212013; 2. 丹阳精密合金厂, 江苏 镇江 212352)
中文关键字：Inconel718合金； Delta工艺； 压缩试验； δ相
英文关键字：Inconel718 alloy; Delta process; compression test; δ phase
中文摘要：针对Inconel 718合金的Delta工艺，通过热压缩实验和扫描电镜及定量金相分析面积法研究了总变形量为70%时，变形温度、变形速率和变形量分配对δ相形貌、分布和数量的影响。实验结果表明，70%变形量下，所有工艺均使δ相得到了不同程度的球化。较高的变形温度和应变速率更有利于δ相的球化和尺寸的一致，终变形温度下大变形量不利于δ相的球化和尺寸的一致；δ相的分布受应变速率的影响较大，在1020～950 ℃和20%～50%变形量分配下，应变速率1 s-1时形成了严重的混晶组织，使得δ相分布极不均匀；δ相的数量随温度的降低和应变速率的减小而呈增多趋势。
英文摘要：Aimed at Delta-process(DP) for Inconel 718, the influence of deformation parameters, such as temperature, strain rate and deformation assignment on the morphology, distribution and quantity of δ phase was investigated by two-step compression test and area quantitative metallographical analysis when the total strain is 70%. The results indicate that δ phase at the total strain of 70% is sphericized in different degree. The higher deformation temperature and strain rate are beneficial to the spheroidization and the size consistency of δ phase, and the larger strain at the end deformation temperature is not beneficial. The distribution of δ phase is greatly influenced by strain rate. The mixed grain structure induces greatly nonuniform distribution of δ phase at the strain rate of 1s-1 between 1020 ℃～950 ℃and 20%～50% deformation. The quantity of δ phase shows increasing trend with the decrease of deformation temperature and strain rate.