Effects of Annealing Temperature on the Microstructure and Properties of Rolled Ti811Alloy

Xia Xiangchun

doi:10.15980/j.tzzz.2019.01.027

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Effects of Annealing Temperature on the Microstructure and Properties of Rolled Ti811Alloy
Vol. 39, Issue 1, Pages: 100-103(2019)
Published： 2019 ，
DOI： 10.15980/j.tzzz.2019.01.027

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[1]夏祥春.退火温度对Ti811轧制合金组织及性能的影响[J].特种铸造及有色合金,2019,39(01):100-103.

Xia Xiangchun. Effects of Annealing Temperature on the Microstructure and Properties of Rolled Ti811Alloy. [J]. Special Casting & Nonferrous Alloys 39(1):100-103(2019)
[1]夏祥春.退火温度对Ti811轧制合金组织及性能的影响[J].特种铸造及有色合金,2019,39(01):100-103. DOI： 10.15980/j.tzzz.2019.01.027.

Xia Xiangchun. Effects of Annealing Temperature on the Microstructure and Properties of Rolled Ti811Alloy. [J]. Special Casting & Nonferrous Alloys 39(1):100-103(2019) DOI： 10.15980/j.tzzz.2019.01.027.

摘要

对Ti811钛合金板材进行多道次轧制

并进行了退火处理

利用光学显微镜、扫描电镜和拉伸试验机研究了轧制Ti811合金的显微组织、断口组织和力学性能。结果表明

轧制态Ti811合金组织主要由细长β相和粗大的板条状α相组成

轧制后退火可促进α相晶粒和β相晶粒等轴化

同时退火处理也促进了α相晶粒转化成β相晶粒

退火温度越高转换比例越大。退火处理减小了轧制Ti811合金的异向抗拉强度差

其中900℃退火试样的室温综合力学性能最好

轧制方向（LD）和厚度（TD）方向抗拉强度分别达到947.4MPa和924.7MPa

伸长率分别达到11.6%和9.4%。另外

断裂方式为韧性断裂。

Abstract

The Ti811 titanium alloy sheet was subjected to multi-pass rolling and then annealed.The microstructure

fracture structure and mechanical properties of the rolled alloy were analyzed by optical microscope

scanning electron microscope and tensile testing.The results reveal that the microstructure of the rolled titanium alloy is mainly composed of elongatedβ-phase grains and coarse lath-likeα-phase grains.Annealing after rolling can promote the equiaxification ofα-phase grains andβ-phase grains.Meanwhile

annealing treatment also promotes the conversion ofαphase grains intoβphase grains

and with increasing in the annealing temperature

the conversion ratio is increased.Annealing treatment is beneficial to reduce the difference of the anisotropic tensile strength of the rolled titanium alloy.The room temperature comprehensive mechanical properties of the samples annealed at 900℃ present desirable

where the tensile strength of LD and TD direction are 947.4MPa and 924.7MPa and the elongations reach 11.6%and 9.4%

respectively.The fracture modes of the two samples annealed at900℃are characterized by ductile fracture.