The effects of temperature and pressure on density, microstructure and mechanical properties of powder compacts during hot isostatic pressing（HIPping） were investigated. Optimized HIPping parameters of temperature r...The effects of temperature and pressure on density, microstructure and mechanical properties of powder compacts during hot isostatic pressing（HIPping） were investigated. Optimized HIPping parameters of temperature range from 900 to 940℃, pressure over 100 MPa and holding time of 3 h, were obtained. Tensile properties after different heat treatments show that both the geometry of samples and cooling rate have a significant influence on mechanical properties. Finite element method was used to predict the temperature field distribution during HIPped sample cooling, and the experimental results are in agreement with simulation prediction. The interaction of HIPping parameters was analyzed based on the response surface methodology（RSM） in this study.展开更多
Pre-alloyed powder of Ti-22Al-24Nb-0.5Mo（atomic fraction,%） was prepared by gas atomization.Powder metallurgy（PM） Ti 2AlNb alloys were prepared by a hot isostatic pressing（HIPing） route.The influence of experime...Pre-alloyed powder of Ti-22Al-24Nb-0.5Mo（atomic fraction,%） was prepared by gas atomization.Powder metallurgy（PM） Ti 2AlNb alloys were prepared by a hot isostatic pressing（HIPing） route.The influence of experimental variables including HIPing temperatures,solution and aging temperatures on microstructure and properties of PM Ti 2AlNb alloys was studied.The results showed that HIPing temperature affected the porosity distribution and mechanical properties of PM Ti 2AlNb alloys.The microstructure and mechanical properties of the PM Ti 2AlNb alloys changed obviously after various post heat treatments,and a good combination of tensile strength,ductility and rupture lifetime was obtained through an optimized heat treatment in the present work.展开更多
文摘The effects of temperature and pressure on density, microstructure and mechanical properties of powder compacts during hot isostatic pressing（HIPping） were investigated. Optimized HIPping parameters of temperature range from 900 to 940℃, pressure over 100 MPa and holding time of 3 h, were obtained. Tensile properties after different heat treatments show that both the geometry of samples and cooling rate have a significant influence on mechanical properties. Finite element method was used to predict the temperature field distribution during HIPped sample cooling, and the experimental results are in agreement with simulation prediction. The interaction of HIPping parameters was analyzed based on the response surface methodology（RSM） in this study.
文摘Pre-alloyed powder of Ti-22Al-24Nb-0.5Mo（atomic fraction,%） was prepared by gas atomization.Powder metallurgy（PM） Ti 2AlNb alloys were prepared by a hot isostatic pressing（HIPing） route.The influence of experimental variables including HIPing temperatures,solution and aging temperatures on microstructure and properties of PM Ti 2AlNb alloys was studied.The results showed that HIPing temperature affected the porosity distribution and mechanical properties of PM Ti 2AlNb alloys.The microstructure and mechanical properties of the PM Ti 2AlNb alloys changed obviously after various post heat treatments,and a good combination of tensile strength,ductility and rupture lifetime was obtained through an optimized heat treatment in the present work.
