时效温度对LF9合金组织与性能的影响

Effect of Aging Temperature on Microstructure and Mechanical Properties of LF9 Alloy

研究了在不同温度时效后LF9合金组织与性能的变化。结果表明:在相同保温时间下,随着时效温度的升高,合金的室温和高温拉伸强度均升高,塑性、冲击功均下降;时效后合金的主要析出相为γ′、M_(23)C_6、MC相;主要强化相γ′的析出量随时效温度的升高而增加,当温度低于720℃时,γ′相析出量增加显著,温度高于720℃时,析出量的增加趋于稳定;但时效温度对M_(23)C_6和MC相的析出量影响不大;γ'相平均粒径与时效温度呈正线性关系。

Variation of microstructure and mechanical properties of LF9 alloy after aging at different temperatures was studied. The results show that with increasing the aging temperature, tensile strength both at room and high temperature of the alloy increased, plasticity and impact toughness decreased; the primary precipitated phases were γ, M23 C6 and MC after aging. The precipitated amount of the main strengthening phase γ＇ increased with increasing the aging temperature. When the temperature was below 720 ℃, the amount increased signifcantly, while above 720 ℃, the amount increased stably. The aging temperature had little effect on the precipitated amount of M23C6 and MC phase. There was a linear relationship between average size of γ＇ phases and the aging temperature.