铸造技术2025，Vol.46Issue(4)：307-315,9.DOI:10.16410/j.issn1000-8365.2025.4189
Ti-43Al-4Nb-1Mo-0.2B合金多道次热轧后冷却速率对其组织演化及性能的影响
Effect of the Cooling Rate on the Microstructure Evolution and Properties of Ti-43Al-4Nb-1Mo-0.2B Alloy After Multiple Pass Hot Rolling
摘要
Abstract
Cooling rate significantly influences the microstructural evolution and mechanical properties of TiAl sheets following multipass hot-pack rolling In this study,Ti-43Al-4Nb-1Mo-0.2 B(at％,TNM)sheets were prepared through furnace-cooling and air-cooling methods after rolling.The microstructural morphology,phase transformation,and recrystallization behavior of TNM sheets were systematically investigated at different cooling rates.Furthermore,the mechanical properties of the alloy at room temperature were evaluated,and the underlying deformation mechanisms were clarified.The results indicate that slow cooling facilitates the α2→β0 phase transition both within and at the boundaries ofα2/γ lamellar colonies while also promoting the nucleation and growth of equiaxed γ recrystallized grains surrounding these colonies.However,compared with slow cooling,rapid cooling promotes the α2→γ phase transition,resulting in a decrease in the α2/γ interlamellar spacing from 140 nm to 60 nm.In addition,the strength and plasticity of the TNM sheets are simultaneously enhanced because the γ laths have heterogeneous thicknesses and few γ recrystallized grains surround theα2/γ lamellar colonies under rapid cooling conditions,achieving a tensile strength of 1 140 MPa and an engineering strain exceeding 1％.关键词
TiAl板材/冷却速率/组织演化/拉伸性能Key words
TiAl sheet/cooling rate/microstructure evolution/tensile properties分类
金属材料引用本文复制引用
卫贝贝,马彪,陈晓飞,张翔,唐斌..Ti-43Al-4Nb-1Mo-0.2B合金多道次热轧后冷却速率对其组织演化及性能的影响[J].铸造技术,2025,46(4):307-315,9.基金项目
国家重点研发计划(2021YFB3702604) （2021YFB3702604）
西北工业大学博士学位论文创新基金(CX2023045) （CX2023045）
