摘要
分析了GH4169合金经960℃×1 h+720℃×8 h+620℃×8 h标准热处理后再经650℃长期时效(100~4000 h)后的组织演变规律和力学性能,探究合金在长期时效过程中的组织演变与力学性能变化之间的关系。结果表明:合金在650℃时效100~800 h时,晶内会持续析出较多细小γ″、γ′相,晶界处伴有δ相析出,合金的硬度呈上升趋势;时效1600~2400 h时,γ″、γ′相逐渐长大,δ相逐渐粗化并且周围出现贫γ″区,合金硬度上升趋缓;时效3200~4000 h时,γ″、γ′相粗化明显且晶内大量γ″相转变为δ相,合金的硬度下降。长期时效过程中合金的抗拉强度及屈服强度变化规律与硬度一致,塑性呈现不断下降的趋势。
After standard heat treatment of 960℃×1 h+720℃×8 h+620℃×8 h,GH4169 alloy was subjected to long-term aging at 650℃for 100-4000 h.The microstructure evolution law mechanical properties and their relationship of the alloy during long-term aging was explored.The results show that after aging at 650℃for 100-800 h,a large number ofγ″andγ′phases precipitate in the grain,δphase precipitates at the grain boundary,and the hardness of the alloy increases.After aging for 1600-2400 h,γ″andγ′phases grow up gradually,δphase coarsens gradually andγ″poor zone appears around theδphase,and the alloy hardness increases slowly.After aging for 3200-4000 h,γ″andγ′phases coarsen obviously and a large number ofγ″phases change intoδphase,and the hardness of the alloy decreases.Meanwhile,the tensile strength and yield strength of the alloy after long-term aging are consistent with the change of hardness,and the plasticity shows a decreasing trend.
作者
陶天成
臧凯
朱治愿
Wang Chengyu;An Teng;Xie Xingfei;Li Shaomin;Qu Jinglong(Beijing GAONA Materials and Technology Co.,Ltd.,Beijing 100081,China;Research Institute of High Temperature Materials,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2024年第4期83-88,共6页
Heat Treatment of Metals
关键词
GH4169合金
长期时效
析出相
力学性能
GH4169 alloy
long-term aging
precipitated phase
mechanical properties
