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TA15钛合金多向锻造组织和拉伸性能研究
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合肥工业大学

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中图分类号:

TG379

基金项目:

航空科学基金(2017ZEP4003) ,国家自然科学基金资助(项目号51675154)


Microstructure and Tensile properties of Multi-directional forging of TA15 Titanium Alloy
Author:
Affiliation:

Hefei University of Technology

Fund Project:

Aeronautical Science Foundation of China(2017ZEP4003);The National Natural Science Foundation of China (51675154)

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    摘要:

    通过多向锻造工艺制备不同变形道次和变形温度的TA15钛合金试样,利用金相观察、EBSD、晶粒尺寸统计和准静态拉伸试验,分析变形过程中组织形貌、晶粒尺寸、相含量、晶界取向差和力学性能的变化。结果表明:TA15钛合金经700 ℃中温多向锻造后获得显著细化的等轴组织,且随着变形道次的增加,促使大角度晶界含量增加,同时晶粒尺寸逐渐减小,3道次后初生α平均晶粒尺寸细化至约为6.0 μm,变形后组织为α+β相,相比初始组织α相含量减少,β相含量增加;在800 ℃和900 ℃变形条件下晶粒尺寸增加,但小于初始试样;坯料的强度经多向锻造后有较大提升,700 ℃、3道次后材料抗拉强度为1443 MPa,延伸率为13.6%,比初始试样略有降低,900 ℃材料抗拉强度为1178 MPa,延伸率提高到15.8%,综合性能得到明显提升。

    Abstract:

    TA15 alloy samples with different forging passes and deformation temperature were prepared by multidirectional forging process. Using metallographic observation, EBSD, grain size statistics and qusai-static tensile test, the microstructure morphology, grain size, phase content, misorientation angles and mechanical properties during deformation process were analyzed. The experimental results show that a significant equiaxed structure of TA15 alloy is obatained after multidirectional forging at mediun temperature of 700 ℃, and the ratio of high angle boundary increased. Moreover, after 3 pass deformation the average grain size of primary α phase can be refined to 6.0 μm. Besides the deformation microstructure is (α+β) phase, the content of β phase increases compared with initial microstructure. With the increasing of deformation temperature, the grain size increases at 800 ℃ and 900 ℃, but is still smaller than the intial sample. The tensile strength has been improved significantly after multidirectional forging, correspondingly after 3 pass MDF at 700 ℃, the tensile strength of the samples is increased to 1443 MPa and the elongation is 13.6%, which have been slightly lower than the as-received sample. Deformation sample at 900℃,tensile strength is 1178 MPa, the elongation is increased to 15.8%. Finally, comprehensive properties of materials are significantly improved

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薛克敏,郭威威,时迎宾,纪小虎,甘国强,李萍. TA15钛合金多向锻造组织和拉伸性能研究[J].稀有金属材料与工程,2019,48(10):3340~3345.[Xue Kemin, Guo Weiwei, Shi Yingbin, Ji Xiaohu, Gan Guoqiang, Li Ping. Microstructure and Tensile properties of Multi-directional forging of TA15 Titanium Alloy[J]. Rare Metal Materials and Engineering,2019,48(10):3340~3345.]
DOI:10.12442/j. issn.1002-185X.20180534

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  • 收稿日期:2018-05-23
  • 最后修改日期:2018-05-29
  • 录用日期:2018-06-15
  • 在线发布日期: 2019-11-01
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