Al含量对GH4169镍基合金组织及其稳定性的影响  

EFFECTS OF Al CONTENT ON MICROSTRUCTURE AND STABILITY OF GH4169 NICKEL BASE ALLOY

作　　者：刘芳[1,2] 孙文儒[3] 杨树林[3] 李战[4] 郭守仁[3] 杨洪才 胡壮麒[3] 

机构地区：[1]东北大学材料与冶金学院 [2]中国科学院金属研究所,沈阳,110016 [3]中国科学院金属研究所 [4]沈阳理工大学材料科学与工程学院

出　　处：《金属学报》2008年第7期791-798,共8页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50271072和50471083资助~~

摘　　要：GH4169合金中当Al含量处于合金标准范围内(0.45%)时,其晶内强化相γ″和γ′分开析出,晶界主要析出相为δ相;当Al含量为1.24%以上时,合金晶内析出γ″/γ′"包覆组织",晶界δ相显著减少,而析出了大量的Laves相和少量的M_7C_3相及σ相.680℃,1000h长期时效后,高Al合金中"包覆组织"长大缓慢,但晶界相数量显著增加,尺寸明显长大,而且析出了α-Cr相.随Al含量增加,这种趋势更加明显.Al含量增加显著地降低合金的室温冲击韧性,680℃长期时效后,冲击值更低.When Al contents are in the standard range required by GH4169 alloy （0.45%）, γ″ phase and γ′ phase precipitated separately in the matrix grain, and δ phase precipitated as the main precipitate along the grain boundaries. When Al content ≥1.24%, γ″/γ′ with compact morphology formed in the grain, δ phase decreased greatly and a large amount of Laves phase, a small amount of M7C3 carbide and a phase precipitated along boundaries. After aging at 680 ℃ for 1000 h, the compact morphology grew slowly, whereas the phases precipitated along the grain boundaries increased in amount and coarsened in dimension, and α-Cr phase appeared. This trend is more obvious with increasing Al content, as a result, the impact toughness of the alloy is largely decreased.

关 键 词：GH4169镍基合金 AL “包覆组织” LAVES相 M7C3碳化物 Σ相 冲击韧性 

分 类 号：TF777.1[冶金工程—钢铁冶金]