Abstract：: Effects of aging treatment on microstructure and properties of 0Cr15Ni70Ti3AlNb alloy were investigated with the help of phase analysis, scanning electron microscopy( SEM) and universal testing machine. The results show that The main precipitation phases include MC, M23C6,γ′.The quantity of MC and M23C6 is unchanged basically at the aging temperature of 650,670,690℃.With the increase of aging temperature, the content of γ′ increases constantly, and also grain size has a trend to increase. When aging temperature increases from 650℃ to 750℃, Mass fraction of γ′ changes from 4.971% to 10.744%,and grain size of γ′ increases from 11.0nm to 38.8nm.When aging temperature is 650℃,fine spherical γ′ precipitates in the grain, chain precipitations occur at the aging temperature of 750℃,and when aging temperature increases to 810℃ and 830℃, cubic γ′ precipitates. With the increase of aging temperature, the strength increases first and then decreases, the aging temperature started from 750℃, and the strength drops sharply. When the aging temperature is 720℃,the impact toughness reaches a minimum value.
[1]Masoumi F,Shahriari D,Jahazi M,et al.Kinetics and Mechanisms of γ' Reprecipitation in a Ni-based Superalloy.[J].Scientific reports,2016,6. [2]James C Williams,Edgar A Starke.The Golden Jubilee Issue—Selected topics in Materials Science and Engineering:Past,Present and Future,edited by S.Suresh.[J].Acta Materialia,2003,51(19). [3]Manfred Peters,Martine Poulain,Uwe Schulz,et al.Some recent trends in research and technology of advanced thermal barrier coatings[J].Aerospace science and technology,2003,7(1):73-80.[4]Hwang JY, Banerjee R, Tiley J,Srinivasan R, et al. Nanoscale characterization of elementalpartitioning between gamma and gamma prime phases in René 88 DT nickel-base superalloy[J]. Metall Mater Trans A2009,40:24–35. [5]Babu SS, Miler MK, Vitek JM, David SA. Characterization of the microstructure evolution in a nickel base superalloy during continuous cooling conditions[J]. Acta Mater 2001,49:4149–60. [6]Sarosi PM, Wang B, Simmons JP, et al. Formation of multimodal size distributions of γ′ in a nickel-base superalloy during interrupted continuous cooling. [J]Science Mater 2007,57:767–70. [7]Wen YH, Simmons JP, Shen C, et al. Phase-field modeling of bimodal particle size distributions during continuous cooling[J]. Acta Mater 2003,51:1123–32. [8]Wen YH, Wang B, Simmons JP, et al. A phase-field model for heat treatment applications in Ni-based alloys[J]. Acta Mater 2006,54:2087–99.
2020, Vol. 27 