摘要
本文研究了GH35A合金在650—750℃,100—10000h时效过程中性能和组织的变化。结果表明,合金室温拉伸强度基本不受时效温度和时间的影响,而室温塑性、韧性及700℃持久寿命在时效至某一时间后开始降低,但下降速度缓慢,直到10000h仍有较高的水平。同时,随时效温度提高,性能降低的开始时间缩短。合金性能的变化主要取决于σ相析出的时间、形态、分布以及σ相的特征。
The mechanical properties and microstructures of an Fe-base GH35Asuperalloy have been examined during aging at 650--750℃ for 100--10000h. Thetensile strength of the alloy changes no more with aging temperature and time atroom temperature, but the ductility and impact toughness at room temperature, aswell as stress-rupture life up to 700℃ decrease slowly during aging even till10000h. And the initiation time to worsen its properties becomes shorter as theaging temperature increasing. The mechanical properties of the alloy are found tobe mainly varied with the formation, morphology, distribution and character of theσ-phase precipitation.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第4期A262-A269,共8页
Acta Metallurgica Sinica
关键词
高温
合金
时效
力学性能
superalloy
aging
mechanical property
σ-phase, γ′-phase
