长期时效对DZ411合金组织与硬度的影响  

Effect of long-term aging on microstructure and hardness of DZ411 alloy

作　　者：杨罡正亮 曹铁山[1] 王威 李萍[1] 赵杰[1] Yang Gangzhengliang;Cao Tieshan;Wang Wei;Li Ping;Zhao Jie(School of Materials Science and Engineering,Dalian University of Technology,Dalian Liaoning 116024,China;China Aerospace Shenyang Engine Research Institute,Shenyang Liaoning 110066,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024 [2]中国航发沈阳发动机研究所,辽宁沈阳110066

出　　处：《金属热处理》2025年第4期128-133,共6页Heat Treatment of Metals

基　　金：航空发动机及燃气轮机基础科学中心项目(P2021-A-Ⅳ-001-001);船用燃气轮机基础研究项目(MGT2023001);国家自然科学基金(51901035)。

摘　　要：为探索长期时效处理对DZ411合金组织与硬度的影响,利用场发射扫描电镜和维氏硬度计对不同温度长期时效后DZ411合金进行微观组织观察和硬度测量,对γ′相形状、尺寸和数量进行定量表征,探讨了γ′相定量参数与硬度之间的变化关联。结果表明:热处理态合金为γ/γ′两相共存的显微结构,其中γ′相为立方状,分布较为均匀,并存在葵花状的共晶组织与一定量的块状碳化物。长期时效处理后,γ′相的尺寸逐渐增大,立方度降低,粒子密度减小,面积分数几乎不变,且温度越高定量参数变化速率越快;γ′相长大受到合金元素扩散控制,长大动力学遵循LSW机制;合金的沉淀强化作用减弱,硬度值降低。To investigate the influence of long-term aging treatment on the microstructure and hardness of DZ411 alloy,microstructural observation and hardness measurement of the DZ411 alloy following long-term aging at various temperatures were conducted using field emission scanning electron microscope and Vickers hardness testing device to quantitatively analyze the morphology,dimensions,and quantity ofγ′phases,and to investigate the relationship between the quantitative parameters ofγ′phases and the corresponding changes in hardness.The results indicate that the heat-treated alloy exhibits a microstructure featuring the coexistence ofγ/γ′phases,with theγ′phase being cubic and evenly dispersed,alongside a sunflower-like eutectic structure containing a proportion of blocky carbides.Following the long-term aging treatment,the size of theγ′phase increases gradually,cubicity decreases,particle density reduces,area fraction remains relatively constant,and the rate of quantitative parameters change accelerates with higher temperatures.The growth of theγ′phase is governed by alloying element diffusion,adhering to the LSW mechanism for growth kinetics,while precipitation strengthening of the alloy is weakened,resulting in decreased hardness values.

关 键 词：DZ411合金 长期时效 γ′相 硬度 

分 类 号：TG113.12[金属学及工艺—物理冶金]