变形Ni_3Al基合金的热处理工艺  

Heat treatment process for Ni_3Al-based wrought superalloy

作　　者：段修涛 李尚平[1] 骆合力[1] 王建涛[1] 

机构地区：[1]钢铁研究总院高温材料研究所,北京100081

出　　处：《钢铁研究学报》2015年第11期60-65,共6页Journal of Iron and Steel Research

摘　　要：研究了固溶处理温度对Ni3Al基合金板材组织和高温拉伸性能的影响。结果表明:随着固溶温度升高到1 280℃,β相含量逐渐降低,γ′+γ两相区的含量逐渐升高,继续升高到1 310℃后,β相含量出现增长,γ′+γ两相区的含量维持一定;由于随着温度的升高,β相沿晶界析出,直到1 280℃时合金晶粒才开始长大,1 280℃以下热处理时合金的晶粒尺寸存在取向性;1 000℃拉伸时,裂纹在β相与γ′相包覆层交界处萌生;γ′+γ两相区含量的增多有利于合金强度的提高,经1 280℃×16min,空冷热处理后合金具有优异的综合力学性能。Influence of solution treatment temperature on microstructure and high-temperature tensile properties of Ni3Al-based alloy sheet was investigated. The results show that volume fraction of β phase reduces and volume fraction of γ′- γ region increases with increasing heat treatment temperature up to 1280 ℃. When the temperature reaches to 1 -10 ℃, volume fraction of γ′＋ γ region keeps at the same level but that of β phase increases. Due to precipitation of β phase along grain boundary with the temperature raising, grains begin to grow up until the tern perature reaches 1 280 ℃. The grain sizes are different for different directions at the solution treatment temperature below 1 280 ℃ . Crack initiates at the interface of β and γ′ envelope during 1000 ℃ tensile test. The increase of volume fraction ofγ′- γregion can increase the strength of the alloy. The alloy has excellent comprehensive mechani cal properties after heating at 1 280 ℃for 16 min and AC.

关 键 词：NI3AL基合金 变形板材 固溶处理 微观组织 力学性能 

分 类 号：TG156.94[金属学及工艺—热处理]