摘要
研究了不同参数的热处理制度(均匀化+固溶+一次时效+二次时效处理)对第二代低铼镍基单晶高温合金组织的影响。结果表明:均匀化和固溶处理几乎消除了合金元素的偏析和共晶组织。随着高温固溶处理温度的升高,γ’相的形貌从立方形逐渐变为近圆形,尺寸变化不明显,在1320℃时,立方度最佳且尺寸约为360 nm。随着一次时效温度的升高,γ’相尺寸逐渐由固溶态时的360 nm增大到435 nm;温度过高时(1200℃),出现γ’相的边角钝化、部分γ’相连接的现象。随着一次时效时间的延长,γ’相的立方度先逐渐升高,随后出现钝化现象。在900℃时进行二次时效,γ’相有着规则的立方度,尺寸细小均匀。该单晶合金的最佳热处理工艺为:1270℃/2 h+1280℃/2 h+1320℃/4 h,AC+1100℃/4 h,AC+900℃/24 h,AC。
The effect of heat treatment(homogenization+solution+primary aging+secondary aging)with different parameters on the microstructure of the second generation low-rhenium nickel based single crystal superalloy was studied.The results show that,the homogenization and solution treatment almost eliminates element segregation and eutectic structure of alloy.With the increase of high temperature solution treatment temperature,the morphology ofγ'phase gradually changes from square to near circle,and the size change is not obvious.At 1320℃,the cubic degree is the best and the size is about 360 nm.With the increase of the aging temperature,the size of theγ'phase gradually increases from 360 nm in solid solution state to 435 nm.When the temperature is too high(1200℃),the edge ofγ'phase is passivated and part ofγ'is connected.With the increase of primary aging time,the cubic degree ofγ'phase increases gradually,and then passivation occurs.After secondary aging at 900℃,theγ'phase has a regular cubic degree and the size ofγ'phase is fine and uniform.The optimum heat treatment process of the single crystal alloy is as follows:1270℃/2 h+1280℃/2 h,AC+1320℃/4 h,AC+1100℃/4 h,AC+900℃/24 h,AC.
作者
王安东
马亚硕
施轶超
吕金娟
WANG Andong;MA Yashuo;SHI Yichao;LYU Jinjuan(Institute of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China)
出处
《热加工工艺》
北大核心
2020年第12期113-118,共6页
Hot Working Technology
基金
江苏省科技支撑计划(工业部分)资助项目(BE2014007-4)。
关键词
低铼单晶合金
热处理
组织演变
γ’相
low-rhenium nickel based single crystal alloy
heat treatment
microstructure evolution
γ'phase
