| 航天紧固件用TC4钛合金棒材固溶时效后的组织与性能 |
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| 引用本文： | 吴晨,马保飞,肖松涛,李敏娜.航天紧固件用TC4钛合金棒材固溶时效后的组织与性能[J].金属热处理,2021,46(11):166-169. |
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| 作者姓名： | 吴晨 马保飞 肖松涛 李敏娜 |
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| 作者单位： | 西北有色金属研究院, 陕西 西安 710016 |
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| 摘 要： | 对航天用紧固件TC4钛合金棒材进行固溶时效处理,对棒材不同位置进行显微组织观察、硬度和室温拉伸性能检测。结果表明:TC4钛合金棒材经固溶时效后表面至心部的组织与性能受冷却速度的影响呈现显著差异。固溶时效后的显微组织由稳定的等轴α相、弥散的马氏体α′相和亚稳定β相组成,试样端面上因冷却速度相差不大,次生α相的形态和含量没有明显差异;中部截面上边部至心部的次生α相含量逐渐增多,同时次生α相片层厚度逐渐增大并趋于等轴化。端面上不同位置显微硬度值没有明显差异,但中部截面上由边部至心部的显微硬度值呈总体降低趋势,且中部截面上边部的显微硬度值与端面相差不大。试样心部因固溶过程中冷却缓慢,整体试样的室温拉伸性能明显低于去除心部的试样。
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| 关 键 词： | 紧固件用TC4钛合金 固溶处理 时效 冷却速度 组织 性能 |
| 收稿时间： | 2021-05-02 |
Microstructure and properties of TC4 titanium alloy bar for aerospace fasteners after solid solution treatment and aging |
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| Wu Chen,Ma Baofei,Xiao Songtao,Li Minna.Microstructure and properties of TC4 titanium alloy bar for aerospace fasteners after solid solution treatment and aging[J].Heat Treatment of Metals,2021,46(11):166-169. |
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| Authors: | Wu Chen Ma Baofei Xiao Songtao Li Minna |
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| Affiliation: | Northwest Nonferrous Metals Research Institute, Xi'an Shaanxi 710016, China |
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| Abstract: | TC4 titanium alloy bars for aerospace fasteners were treated by solid solution treatment and aging, the miorostructure, hardness and room temperature tensile properties at different positions of the alloy bar were observed and examined. The results show that the microstructure and properties of the alloy bar after solid solution and aging treatments are significantly different from surface to core because of the cooling rate difference. After solid solution treatment and aging, the microstructure consists of stable equiaxed α, dispersed α′ martensite and substable β phases. There is no significant difference in morphology and content of secondary α phase in the end section of the specimen because of the similar cooling rate. From the upper part of the middle section to the core, the secondary α phase increases in content gradually, and the secondary α phase layer increases in thickness step by step and tends to be equiaxed. There is no obvious difference in microhardness at different positions of the end section, but the microhardness value from edge to core on the middle section shows a general decreasing trend, and the microhardness at edge on the middle section is close to that of the end section. Because of the slow cooling of the specimen core during solution treatment, the tensile properties of the whole specimen at room temperature are obviously poorer than those of the specimen with its core part removed. |
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| Keywords: | TC4 titanium alloy for fasteners solid solution treatment aging cooling rate microstructure properties |
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