长期时效对GH4169合金组织与性能的影响
Effect of long-term aging on microstructure and properties of GH4169 alloy
陶天成 1臧凯 1朱治愿1
作者信息
- 1. 江苏科技大学材料科学与工程学院,江苏镇江 212000
- 折叠
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.
Abstract
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 of γ"and y'phases precipitate in the grain,8 phase precipitates at the grain boundary,and the hardness of the alloy increases.After aging for 1600-2400 h,γ"and γ'phases grow up gradually,8 phase coarsens gradually and γ"poor zone appears around the δ phase,and the alloy hardness increases slowly.After aging for 3200-4000 h,γ"and γ'phases coarsen obviously and a large number of γ"phases change into 8 phase,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.
关键词
GH4169合金/长期时效/析出相/力学性能Key words
GH4169 alloy/long-term aging/precipitated phase/mechanical properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据