TC21钛合金锻后热处理α片层的球化及强化增塑机理

doi:10.13251/j.issn.0254-6051.2023.08.022

金属热处理 ›› 2023, Vol. 48 ›› Issue (8): 138-143.DOI: 10.13251/j.issn.0254-6051.2023.08.022

TC21钛合金锻后热处理α片层的球化及强化增塑机理

陶成, 崔霞, 欧阳德来, 蓝希鑫, 万兴才

南昌航空大学材料科学与工程学院, 江西南昌 330063

收稿日期:2023-02-21 修回日期:2023-06-05 出版日期:2023-08-25 发布日期:2023-10-10
通讯作者: 崔霞,副教授,博士,E-mail: cuixia2000@163.com
作者简介:陶成(1997—),女,硕士研究生,主要研究方向为航空钛合金组织与性能调控,E-mail: 1060086015@qq.com。
基金资助:
国家自然科学基金(51761029,51864035);江西省自然科学基金(20224BAB204013)

Mechanism of α lamellae spheroidization and strengthening plasticization of TC21 titanium alloy after post forging heat treatment

Tao Cheng, Cui Xia, Ouyang Delai, Lan Xixin, Wan Xingcai

School of Materials Science and Engineering, Nanchang Aviation University, Nanchang Jiangxi 330063, China

Received:2023-02-21 Revised:2023-06-05 Online:2023-08-25 Published:2023-10-10

摘要/Abstract

摘要： 对经过最佳参数多向锻造(920 ℃-0.92单道次真应变-3周期-水冷)后的TC21钛合金进行球化热处理,并对多向锻造前、后及热处理后的试样进行了拉伸性能测试,研究了不同热处理工艺参数(温度830~920 ℃,保温时间1~4 h)下锻后合金α片层组织球化(等轴化)的演变规律,并揭示了合金的强化增塑机理。结果表明,配合920 ℃-0.92单道次应变量-3周期-水冷的多向锻造后的TC21钛合金较合适的球化热处理工艺参数为890 ℃-2 h-空冷。合适的球化热处理温度和保温时间能够促进TC21钛合金α片层的球化,经较佳参数锻造及后续热处理后的合金强度和塑性显著提升,屈服强度和伸长率分别达到894.0 MPa和13.2%。经球化热处理的TC21钛合金的强化增塑机理主要为α相晶粒细化引起的细晶强化及β相中析出的针状次生α相引起的位错强化。

关键词: TC21钛合金, 多向锻造, 球化热处理, α片层球化, 强化增塑机理

Abstract: TC21 titanium alloy was subjected to spheroidization heat treatment after multi-directional forging under optimal parameters(920 ℃-0.92 single pass true strain-3 cycles-water cooling), and the tensile properties of the specimens before and after forging and after spheroidization heat treatment were tested. The evolution law of α lamellae spheroidization (equiaxation) under different heat treatment parameters (temperature of 830-920 ℃, holding time of 1-4 h) of the alloy was studied and the strengthening plasticization mechanism of the alloy was revealed. The results show that after optimal multi-directional forging, the preferred subsequent spheroidizing heat treatment parameters for the TC21 titanium alloy are 890 ℃-2 h-air cooling, which can promote α lamellae spheroidization, and make that the yield strength and elongation of the TC21 titanium alloy are significantly improved, reaching 894.0 MPa and 13.2%, respectively. The strengthening plasticization mechanism of the TC21 titanium alloy after spheroidization heat treatment is mainly fine grain strengthening caused by α phase grain refinement and dislocation strengthening induced by needle-like secondary α phase in β phase.

Key words: TC21 titanium alloy, multi-directional forging, spheroidization heat treatment, α lamellae spheroidization, strengthening plasticization mechanism

中图分类号:

TG166.5

陶成, 崔霞, 欧阳德来, 蓝希鑫, 万兴才. TC21钛合金锻后热处理α片层的球化及强化增塑机理[J]. 金属热处理, 2023, 48(8): 138-143.

Tao Cheng, Cui Xia, Ouyang Delai, Lan Xixin, Wan Xingcai. Mechanism of α lamellae spheroidization and strengthening plasticization of TC21 titanium alloy after post forging heat treatment[J]. Heat Treatment of Metals, 2023, 48(8): 138-143.

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TC21钛合金锻后热处理α片层的球化及强化增塑机理

Mechanism of α lamellae spheroidization and strengthening plasticization of TC21 titanium alloy after post forging heat treatment

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