曹小平,张树玲,张长江,张树志.锻态Ti-44Al-4Nb-4V-0.3Mo-Y合金等轴及片层组织高温拉伸性能及组织演变[J].稀有金属材料与工程,2020,49(7):2346~2351.[Xiaoping Cao,Shuling Zhang,Changjiang Zhang,Shuzhi Zhang.Tensile properties and microstructural evolution of hot forged Ti-44Al-4Nb-4V-0.3Mo-Y alloy with equiaxed and lamellar microstructure during high temperature tension[J].Rare Metal Materials and Engineering,2020,49(7):2346~2351.]
锻态Ti-44Al-4Nb-4V-0.3Mo-Y合金等轴及片层组织高温拉伸性能及组织演变
投稿时间:2019-05-16  修订日期:2019-08-17
中文关键词:  TiAl合金  微观组织演变  高温拉伸  机械性能
基金项目:国家自然科学(51604191, 51504153, 51604159) 山西省自然科学基金(201701D221075) 太原理工大学青年专项基金(2015QN014)
中文摘要:
      等轴γ晶粒和α2/γ片层是beta-gamma TiAl合金的两种主要变形组织形态。本文研究了锻态Ti-44Al-4Nb-4V-0.3Mo-Y合金等轴组织及片层组织的高温拉伸性能及组织演变。结果表明:拉伸温度对Ti-44Al-4Nb-4V-0.3Mo-Y合金的力学性能和显微组织有显著的影响。在相同温度下,Ti-44Al-4Nb-4V-0.3Mo-Y合金等轴组织的抗拉强度和屈服强度略高于片层组织,而延伸率相差不大。随拉伸温度的增加,合金的抗拉强度和屈服强度逐渐减小,而延伸率迅速增大。对于等轴组织,提高温度,等轴γ晶粒被拉长,发生完全的动态再结晶,从而细化合金的显微组织。对于片层组织,α2/γ片层的分解和γ板条的再结晶程度随拉伸温度的增加而增大。Ti-44Al-4Nb-4V-0.3Mo-Y合金的韧脆转变温度在750~800℃之间。
Tensile properties and microstructural evolution of hot forged Ti-44Al-4Nb-4V-0.3Mo-Y alloy with equiaxed and lamellar microstructure during high temperature tension
英文关键词:TiAl alloy  Microstructural evolution  High temperature tension  Mechanical properties
英文摘要:
      The equiaxed γ grains and α2/γ laminas are the two main deformed microstructure of beta-gamma TiAl alloy. In this paper, mechanical properties and microstructural evolution of hot forged Ti-44Al-4Nb-4V-0.3Mo-Y alloy with equiaxed and lamellar microstructure were studied during high temperature tension. The results show that tensile temperature has a significant effect on the mechanical properties and microstructures of Ti-44Al-4Nb-4V-0.3Mo-Y alloy. At the same temperature, the tensile strength and yield strength of the TiAl alloy with equiaxed microstructure are slightly greater than those with lamellar structure,however the elongation difference is not significant. With the increase of tensile temperature, the tensile strength and yield strength of TiAl alloy decrease gradually, while the elongation increases significantly. For equiaxed microstructure, increasing tensile temperature, the equiaxed γ grains are elongated and complete dynamic recrystallization occurs to refine the microstructure of the TiAl alloy. For lamellar microstructure, the degree of decomposition of α2/γ laminas and recrystallization of γ laths increase with the increase of tensile temperature. The ductile brittle transition temperature of Ti-44Al-4Nb-4V-0.3Mo-Y alloy is between 750 ~ 800°C.
作者单位E-mail
曹小平 太原理工大学 材料科学与工程学院 xiaopingcao1994@163.com 
张树玲 宁夏大学 机械工程学院  
张长江 太原理工大学 材料科学与工程学院  
张树志 太原理工大学 材料科学与工程学院  
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