预时效处理对亚稳态β钛合金TB18组织性能的影响

doi:10.13251/j.issn.0254-6051.2024.05.017

金属热处理 ›› 2024, Vol. 49 ›› Issue (5): 106-111.DOI: 10.13251/j.issn.0254-6051.2024.05.017

预时效处理对亚稳态β钛合金TB18组织性能的影响

李波¹, 向伟², 张枫³, 秦锋英¹, 袁武华³

1.航空工业第一飞机设计研究院, 陕西西安 710089;
2.中国第二重型机械集团德阳万航模锻有限责任公司, 四川德阳 618000;
3.湖南大学材料科学与工程学院, 湖南长沙 410082

收稿日期:2023-11-07 修回日期:2024-04-01 出版日期:2024-05-25 发布日期:2024-06-28
通讯作者: 袁武华,教授,博士,E-mail:yuan46302@163.com
作者简介:李波(1981—),男,高级工程师,硕士,主要研究方向为航空金属材料应用,E-mail:libo710072@163.com。

Effect of pre-aging treatment on microstructure and mechanical properties of metastable β titanium alloy TB18

Li Bo¹, Xiang Wei², Zhang Feng³, Qin Fengying¹, Yuan Wuhua³

1. AVIC The First Aircraft Institute, Xi'an Shaanxi 710089, China;
2. China National Erzhong Group Deyang Wanhang Die Forging Co., Ltd., Deyang Sichuan 618000, China;
3. School of Materials Science and Engineering, Hunan University, Changsha Hunan 410082, China

Received:2023-11-07 Revised:2024-04-01 Online:2024-05-25 Published:2024-06-28

摘要/Abstract

摘要： 研究了高强亚稳态β钛合金TB18在不同热处理后的显微组织与力学性能的变化规律。结果表明,固溶后的TB18合金直接在525 ℃下时效4 h时,β基体中仍保留较多的无析出区(PFZs),此时合金的抗拉强度为1309 MPa,屈服强度为1227 MPa,伸长率为6.6%;若固溶后先进行300 ℃×2 h的预时效处理再进行时效,TB18合金的显微组织和力学性能并未发生明显的变化;而当预时效的温度提高至400 ℃时,时效后的显微组织将不再存在大面积的无析出区,并同时提高了合金的强度与塑性,其中抗拉强度、屈服强度和伸长率分别为1355 MPa、1278 MPa和7.0%,表现出更好的强度-塑性匹配;此外,所有拉伸试样的断裂模式均为混合断裂,但固溶+400 ℃预时效+时效试样断面上的解理特征更少,韧性断裂的比重更大。

关键词: β钛合金, 预时效, 显微组织, 力学性能, 断裂模式

Abstract: Relationships of microstructure and mechanical properties of high-strength metastable β titanium alloy TB18 after different heat treatments were investigated. The results show that many precipitation-free zones (PFZs) still retains in the β matrix of the TB18 alloy after solution treatment and aging at 525 ℃ for 4 h, where the alloy has an ultimate tensile strength of 1309 MPa, a yield strength of 1227 MPa, and an elongation of 6.6%. When the TB18 alloy is pre-aged at 300 ℃ for 2 h and aged, the microstructure and mechanical properties are not changed significantly. While the pre-aging temperature is increased to 400 ℃, there are no longer significant PFZs distributed in the microstructure after aging, and the strength and plasticity of the alloy are significantly increased, where the tensile strength, yield strength, and elongation are 1355 MPa, 1278 MPa, and 7.0% respectively, showing a better strength-plasticity matching. In addition, all the tensile specimens are fractured in a mixed mode, but the specimens after solution, pre-aging at 400 ℃ and aging have fewer deconstructive features on the section and a greater proportion of ductile fracture.

Key words: β titanium alloy, pre-aging, microstructure, mechanical properties, fracture mode

中图分类号:

李波, 向伟, 张枫, 秦锋英, 袁武华. 预时效处理对亚稳态β钛合金TB18组织性能的影响[J]. 金属热处理, 2024, 49(5): 106-111.

Li Bo, Xiang Wei, Zhang Feng, Qin Fengying, Yuan Wuhua. Effect of pre-aging treatment on microstructure and mechanical properties of metastable β titanium alloy TB18[J]. Heat Treatment of Metals, 2024, 49(5): 106-111.

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预时效处理对亚稳态β钛合金TB18组织性能的影响

Effect of pre-aging treatment on microstructure and mechanical properties of metastable β titanium alloy TB18

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