摘要
采用不同的时效制度处理热等静压+挤压+等温锻造工艺的FGH95合金,并对处理后合金的显微组织和力学性能进行了系统研究。结果表明,经过双级时效(870℃/1 h,AC+650℃/24 h,AC)和单级时效(760℃/10 h,AC)处理后,合金的晶粒度无明显差异,但γ′相的数量、尺寸及分布存在显著差异。相比于单级时效,双级时效可以更有效地促进晶内γ′相粗化,晶内γ′相平均直径达到78 nm,而单级时效为67 nm;同时,双级时效更有利于M 3B 2等晶间强化相的析出。二者的拉伸强度水平相当,但双级时效合金的持久寿命低于单级时效合金,而其持久塑性要优于单级时效合金。
The FGH95 superalloy was processed through HIP+HEX+HIF,then the alloy was conducted by two different aging treatments,and the microstructure,morphology of precipitate phase and mechanical properties were studied.The results show that there is no obvious effect of aging treatments on the grain size,but the amount,the size distribution are obviously different.Compared to single-step aging treatment,double-step aging treatment can more effectively promote the growth of inner-grainγ′phase,the average diameter of inner-grainγ′phase can reach 78 nm,while that is 67 nm for single-step aging treatment.Meanwhile,double-step aging is more beneficial to the precipitation of inner-grain strenthening phases,such as M 3B 2 and etc.The tensile strength of the alloy with different aging is similar,but the endurance life of alloy with double-step aging is lower,and the endurance plasticity is higher.
作者
王旭青
彭子超
罗学军
马国君
武丹
WANG Xu-qing;PENG Zi-chao;LUO Xue-jun;MA Guo-jun;WU Dan(Key Laboratory of Advanced High Temperature Structural Materials,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2020年第5期120-126,共7页
Journal of Materials Engineering
关键词
挤压
等温锻造
FGH95粉末高温合金
时效
组织和性能
extrusion
isothermal forging
FGH95 P/M superalloy
aging treatment
microstructure and property
