堆垛层错能与反应力蠕变理论在第二相强化高温合金中的应用

Iucluding Stacking Fault Energy Into The Resisting Stress Model For Creep Of Particle Strengthened Superalloys

摘要: 在第二相强化的多元高温合金稳态蠕交速率方程的基础上,考虑了堆垛层错能与反应力蠕变理论,进而提出了一个新的稳态蠕变速率普遍式:
\mathop \rm\varepsilon \limits^\rm\cdot \rms=\rmA''(rs)^\rmno\frac\sigma -\sigma _\rmp\rmE(\rmT)^\rmno\exp (-\frac\rmQ\rmRT)
根据对Ni-Co二元合金,γ'相强化和氧化物弥散强化的镍基高温合金、以及γ'相含量不高不同含Co量的镍基高温合金(Waspaloy)和高γ'相含量的不同含Co量的镍基高温合金(Udimet 700)的蠕变进行验证,说明作者提出的稳态蠕变速率方程是可行的。

Abstract: Af the base of steady state creep rate eguation for multicompment particle-strengthened alloys and in condideration of the stacking fault energie and resisting stress theory in creep, a new generalized steady-state creep rate equation is proposed:
\mathop \rm\varepsilon \limits^\rm\cdot \rms=\rmA''(rs)^\rmno\frac\sigma -\sigma _\rmp\rmE(\rmT)^\rmno\exp (-\frac\rmQ\rmRT)
The applicability of this equation is assessed by the creep of Ni-Co binary alloys, several γ' or oxide dispersion strengthened nickel-base superalloys, low γ' fraction strengthened nickel-base superalloys (Waspaloy) with different contents of cobalt and high fraction γ' strengthened nickel-base superalloys (Udimet‰) with different contents of cobalt. The result of this assessment is available.