β型γ-TiAl合金热变形过程中组织演化及动态再结晶行为研究现状  

Microstructure Evolution and Dynamic Recrystallization Behavior in β-Solidifying γ-TiAl during Thermomechanical Processing

作　　者：强凤鸣 寇宏超[1] 贾梦宇 唐斌[1] 李金山[1] QIANG Feng-ming;KOU Hong-chao;JIA Meng-yu;TANG Bin;LI Jin-shan(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《精密成形工程》2022年第1期11-18,共8页Journal of Netshape Forming Engineering

摘　　要：TiAl合金以其低密度、高比强和良好的抗蠕变性等优点,已在航空发动机上获得应用。先进的β型γ-TiAl合金通过引入一定量的β/B2相,显著改善了合金的热加工能力,该类合金更适合热机械加工。对β型γ-TiAl合金热机械加工过程中的组织演化和变形行为形成完整的认识是制定和优化热加工工艺的前提。综述了β型γ-TiAl合金的不同初始组织在热机械加工过程中的组织演变及其动态再结晶机制,指出当热加工温度低于T_(γ,solv)时,组织演化主要与(α/α_(2)+γ)片层团的破碎有关;当热加工温度高于T_(γ,solv)时,主要与α相的动态再结晶有关,同时分析了β相的存在对(α/α_(2)+γ)片层团以及α相动态再结晶的影响,最后对β型γ-TiAl合金热变形过程中的基础问题进行了总结和展望。Due to the low density,high specific strength and good creep resistance at high temperature,TiAl alloys have been successfully used in aero-engines.Through introduction of high content ofβ-stabilizing alloying elements,the advancedβ-typeγ-TiAl alloys possess improved thermal workability and are more suitable for thermomechanical processing.A thorough understanding of the microstructure evolution and deformation mechanism of theβ-typeγ-TiAl alloys during thermomechanical processing is the prerequisite for formulating and optimizing the processing parameters.Therefore,the microstructure evolution and dynamic recrystallization mechanism ofβ-typeγ-TiAl alloys with different initial microstructures during thermomechanical processing were reviewed and discussed.It was pointed out that when the thermal processing temperature was lower than T_(γ,solv),the microstructure evolution was mainly related to the fragmentation of theα_(2)/γlamellar colonies.When the thermal processing temperature was higher than T_(γ,solv),the microstructure evolution was mainly related to the dynamic recrystallization of theαphase.Besides,the effectsβphase on theα_(2)/γlamellar colonies and the dynamic recrystallization of theαphase were analyzed.The fundamental issues related toβ-typeγ-TiAl alloys during thermomechanical processing are summarized prospected.

关 键 词：TIAL合金 热机械加工 变形行为 再结晶 组织演化 

分 类 号：TG146[一般工业技术—材料科学与工程]