不同热处理工艺对新型Ti421合金组织及性能的影响

桑卓越; 王帅; 尹万兵; 朱春明; 白张; 王鹏; 罗金山; 张永伟; 方略; 李晓燚; 周志明

doi:10.3969/j.issn.1674-6457.2025.09.006

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精密成形工程 ›› 2025, Vol. 17 ›› Issue (9) : 70-78. DOI: 10.3969/j.issn.1674-6457.2025.09.006

轻合金成形

不同热处理工艺对新型Ti421合金组织及性能的影响

桑卓越^1,2, 王帅³, 尹万兵³, 朱春明³, 白张², 王鹏², 罗金山³, 张永伟³, 方略³, 李晓燚³, 周志明^1,*

作者信息 +

Effect of Different Heat Treatments on the Microstructure and Mechanical Properties of a Novel Ti421 Alloy

SANG Zhuoyue^1,2, WANG Shuai³, YIN Wanbing³, ZHU Chunming³, BAI Zhang², WANG Peng², LUO Jinshan³, ZHANG Yongwei³, FANG Lue³, LI Xiaoyi³, ZHOU Zhiming^1,*

Author information +

文章历史 +

摘要

目的实现新型Ti421合金的良好强塑匹配效果。方法研究水冷、空冷及炉冷等不同固溶冷却方式及不同时效温度热处理工艺对合金组织及性能的影响。结果在相同的时效处理工艺条件下,固溶冷却速率的降低会导致在合金组织中等轴初生α相（α_p）含量显著提高的同时尺寸略微增加。同时α_p的存在也会抑制时效处理过程中次生α相（α_s）的生长。结合静态拉伸测试结果发现,含量较多的α_p对合金的塑性较有利。在经过900 ℃固溶炉冷后500 ℃时效处理的合金试样组织中,α_p的体积分数达到了最大值72.8%,此时合金具有最好的塑性（14.2%）。此外,在固溶工艺固定的条件下,时效处理制度的改变基本不影响α_p含量及尺寸的变化,但随着时效温度的升高,β_t上α_s含量增加且尺寸增大,导致合金强度呈现出先升高后降低的趋势。经过900 ℃固溶水冷+550 ℃时效处理后的合金实现了抗拉强度（UTS）为1 484 MPa、延伸率（EL）为11.2%的良好强塑匹配效果。

Abstract

The work aims to obtain the good strength-plastic matching effect of the novel Ti421 alloy. The microstructure and mechanical properties of a novel Ti421 alloy treated by different solution and aging processes were studied. Firstly, under the same aging process, a decrease in the cooling rate after solution treatment led to a significant increase in the content of equiaxed primary α phase (α_p) of the alloy, accompanied by a slight increase in size of α_p. At the same time, the presence of α_p also inhibited the growth of the secondary α phase (α_s) of the alloy during the aging process. Combined with the static tensile test results, it was found that more α_p was beneficial to the plasticity of the alloy. After solution treatment at 900 ℃ and furnace cooling and aging treatment at 500 ℃, the content of α_p of the sample reached the maximum value of 72.8%, indicating that the alloy had the best plasticity (14.2%). In addition, under the fixed conditions of solution treatment, changes in the aging treatment system did not cause the changes in the content and size of α_p. However, with the increase of aging temperature, the content and size of α_s on β_t increased, which led to the trend that the alloy strength firstly increased and then decreased. The alloy achieves good strength-plastic matching with a tensile strength of 1 484 MPa and an elongation of 11.2% after solution treatment at 900 ℃ and water quenching followed with aging treatment at 550 ℃.

导出引用

桑卓越, 王帅, 尹万兵, 朱春明, 白张, 王鹏, 罗金山, 张永伟, 方略, 李晓燚, 周志明. 不同热处理工艺对新型Ti421合金组织及性能的影响[J]. 精密成形工程. 2025, 17(9): 70-78 https://doi.org/10.3969/j.issn.1674-6457.2025.09.006

SANG Zhuoyue, WANG Shuai, YIN Wanbing, ZHU Chunming, BAI Zhang, WANG Peng, LUO Jinshan, ZHANG Yongwei, FANG Lue, LI Xiaoyi, ZHOU Zhiming. Effect of Different Heat Treatments on the Microstructure and Mechanical Properties of a Novel Ti421 Alloy[J]. Journal of Netshape Forming Engineering. 2025, 17(9): 70-78 https://doi.org/10.3969/j.issn.1674-6457.2025.09.006

中图分类号： TG166.5

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