近 α 耐高温钛合金的显微组织和力学性能在热处理过程中的演变规律

马小昭; 相志磊; 李涛; 陈怡兰; 刘莹莹; 陈子勇; 舒群

doi:10.1007/s12613-021-2248-8

Volume 29 Issue 8

Aug. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(8): 1596-1607

Xiaozhao Ma, Zhilei Xiang, Tao Li, Yilan Chen, Yingying Liu, Ziyong Chen, and Qun Shu, Evolution laws of microstructures and mechanical properties during heat treatments for near-α high-temperature titanium alloys, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp. 1596-1607. https://doi.org/10.1007/s12613-021-2248-8

Cite this article as:

Xiaozhao Ma, Zhilei Xiang, Tao Li, Yilan Chen, Yingying Liu, Ziyong Chen, and Qun Shu, Evolution laws of microstructures and mechanical properties during heat treatments for near-α high-temperature titanium alloys, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp. 1596-1607. https://doi.org/10.1007/s12613-021-2248-8

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研究论文

近 α 耐高温钛合金的显微组织和力学性能在热处理过程中的演变规律

1)
北京工业大学材料与制造学部, 北京 100124
2)
国家电网平高集团有限公司, 平顶山 467000
3)
中国航空制造技术研究院, 北京 100024

通讯作者:
陈子勇 E-mail: czy@bjut.edu.cn

中文摘要

耐高温钛合金具有比强度高、比模量高和高温性能优异的优点，主要应用在高性能航空发动机叶片和叶盘，超声速巡航导弹壳体和军用柴油发动机气门等领域。然而，目前对新型耐650℃高温钛合金热处理过程中微纳结构和力学性能演变的研究尚少。本文通过XRD、SEM、EBSD、TEM和拉伸试验等方法研究了热处理过程中合金的显微组织、力学性能和断裂特征的演变规律。研究表明，随固溶温度提升，初生 α 相含量逐渐较小，β 转变组织含量逐渐增加。β 转变组织内部析出大量层片状 α 晶粒，层片的宽度随固溶温度的提升逐渐增加。锻态合金内部既存在尺寸较大的等轴和棒状硅化物，也析出纳米尺寸的硅化物。元素分析表明，大尺寸硅化物或许为(Ti, Zr, Nb)₅Si₃ 和 (Ti, Zr, Nb)₆Si₃。热处理后，尺寸较小的棒状硅化物在残余 β 相中析出，它们与 α/β 界面近似为45°。热处理态合金中的残余 β 相呈半连续状。合金经980°C/1 h固溶和700°C/4 h时效处理后表现出最优的室温和高温（650°C）力学性能的匹配。

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Research Article

Evolution laws of microstructures and mechanical properties during heat treatments for near-α high-temperature titanium alloys

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Abstract

Abstract

Evolution laws of microstructures, mechanical properties, and fractographs after different solution temperatures were investigated through various analysis methods. With the increasing solution temperatures, contents of the primary α phase decreased, and contents of transformed β structures increased. Lamellar α grains dominated the characteristics of transformed β structures, and widths of secondary α lamellas increased monotonously. For as-forged alloy, large silicides with equiaxed and rod-like morphologies, and nano-scale silicides were found. Silicides with large sizes might be (Ti, Zr, Nb)₅Si₃ and (Ti, Zr, Nb)₆Si₃. Rod-like silicides with small sizes precipitated in retained β phase, exhibiting near 45° angles with α/β boundaries. Retained β phases in as-heat treated alloys were incontinuous. 980STA exhibited an excellent combination of room temperature (RT) and 650°C mechanical properties. Characteristics of fracture surfaces largely depended on the evolutions of microstructures. Meanwhile, silicides promoted the formation of mico-voids.
- solution temperatures;
- microstructures;
- mechanical properties;
- fractographs;
- silicides

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近 α 耐高温钛合金的显微组织和力学性能在热处理过程中的演变规律

中文摘要

Evolution laws of microstructures and mechanical properties during heat treatments for near-α high-temperature titanium alloys

Abstract

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