一种镍基粉末高温合金的静态再结晶行为

材料热处理学报, 2012, 33(12): 36-40.

一种镍基粉末高温合金的静态再结晶行为

刘恒三 ^1, , 章林 ^2, , 何新波 ^3, , 曲选辉 ^4, , 张国庆 ^5, , 李周 ^6,

1.北京科技大学新金属材料国家重点实验室,北京100083

2.北京科技大学材料科学与工程学院,北京100083

3.北京科技大学材料科学与工程学院,北京100083

4.北京科技大学新金属材料国家重点实验室,北京100083／北京科技大学材料科学与工程学院,北京100083

5.北京航空材料研究院先进高温结构材料国防科技重点实验室,北京100095

6.北京航空材料研究院先进高温结构材料国防科技重点实验室,北京100095

基金项目: 北京市科技计划课题(D09080300510901)

关键词：粉末冶金 , 镍基高温合金 , 静态再结晶 , EBSD

Recrystallization behavior of a powder metallurgy Ni-based superalloy

Keywords： powder metallurgy , Ni-based superalloy , recrystallization , EBSD

用EBSD和SEM等技术手段研究了热变形后的某种新型镍基粉末高温合金在不同温度下的静态再结晶行为。结果表明，镍基高温合金的静态再结晶开始温度在900℃以上，合金的显微硬度显著下降；而在组织中存在的γ′相和碳化物颗粒抑制再结晶晶粒的长大，在1100℃再结晶退火后合金的平均晶粒尺寸在约5μm。

Recrystallization behavior at different temperaturs of a new P/M Ni-based superalloy hot-rolled was studied by EBSD and SEM. The results reveal that the recrystallization of the alloy occurs at above 900 ℃ with mierohardness dropped obviously. The grain growth is strongly inhibited by γ′ phase and carbides remained along grain boundary, the grain size is almost unchanged, average grain size of the alloy annealed at 1100℃ is about 5 μm.

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