退火工艺对Ti-4Al-2V合金组织及耐蚀性能的影响

doi:10.13251/j.issn.0254-6051.2022.09.008

摘要/Abstract

摘要： 对挤压成形Ti-4Al-2V合金棒材进行普通退火、再结晶退火、双重退火处理,并通过X射线衍射仪、扫描电镜对退火前后的组织结构进行表征。同时,通过电化学工作站测试钛合金在3.5％NaCl溶液中的耐腐蚀性能,分析热处理工艺与合金腐蚀倾向间的相关性。结果表明,未处理合金棒材表面无明显宏微观缺陷,不同温度退火后钛合金主要组织为α相,960 ℃+570 ℃双重退火后,合金组织由粗晶粒状的α相和细针状的α相组成。未处理合金伴有网篮组织,经不同温度退火后获得少量魏氏组织和双态组织。通过分析不同温度退火后钛合金的极化曲线与交流阻抗谱可知,相比未处理合金,760 ℃退火后合金的自腐蚀电流密度较小,对应的极化电阻较大,腐蚀倾向较小,960 ℃+570 ℃双重退火后合金的Nyquist图显示最大的容抗弧,表明其耐蚀性能较好。

关键词: 退火工艺, Ti-4Al-2V合金, 组织结构, 耐蚀性能, 极化曲线

Abstract: Extruded bars of Ti-4Al-2V alloy were treated by ordinary annealing, recrystallization annealing and double annealing, and the microstructure before and after heat treatment was characterized by X-ray diffractometer and scanning electron microscope. Meanwhile, the corrosion resistance of the titanium alloy in 3.5%NaCl solution was tested by electrochemical workstation, and the correlation between the heat treatment process and the corrosion tendency of the alloy was analyzed. The results show that there is no obvious macro and micro defect on the surface of the untreated alloy rod, and the microstructure of the titanium alloy is mainly α phase annealed at different temperatures. After double annealing at 960 ℃+570 ℃, the alloy is composed of coarse-grained α phase and fine needle-like α phase. The untreated alloy is accompanied with a basketweave microstructure, and a small amount of Widmannstatten structure and two-state structure are obtained after different heat treatment. By analyzing the polarization curves and electrochemical impedance spectroscopy of titanium alloy annealed at different temperatures, it can be seen that compared with the untreated alloy, the self-corrosion current density of the alloy annealed at 760 ℃ is smaller, the corresponding polarization resistance is larger, and the corrosion tendency is smaller. The Nyquist plot of the alloy after double annealing at 960 ℃+570 ℃ shows the largest capacitive arc resistance, indicating better corrosion resistance.

Key words: annealing process, Ti-4Al-2V alloy, microstructure, corrosion resistance, polarization curve

中图分类号:

TG178

王璐, 王峰, 张明伟, 刘瑞, 傅正元, 刘景顺. 退火工艺对Ti-4Al-2V合金组织及耐蚀性能的影响[J]. 金属热处理, 2022, 47(9): 41-46.

Wang Lu, Wang Feng, Zhang Mingwei, Liu Rui, Fu Zhengyuan, Liu Jingshun. Effect of annealing process on microstructure and corrosion resistance of Ti-4Al-2V alloy[J]. Heat Treatment of Metals, 2022, 47(9): 41-46.

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