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。
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.
出处
《热加工工艺》
CSCD
北大核心
2010年第22期12-15,共4页
Hot Working Technology
基金
江苏省科技成果转化项目(BA2007104)
江苏省高校自然科学指导性计划项目(09KJD430005)
江苏省先进高技术研究重点实验室开放基金课题资助项目(AMM200902)
江苏大学高级人才启动基金资助项目(08JDG020)
