冷却介质温度对Ti65合金冷却曲线及显微组织的影响

董晓琳, 李文渊, 谭海兵, 刘建荣, 刘巧沐, 陈玉龙, 王磊, 王清江

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材料工程 ›› 2025, Vol. 53 ›› Issue (1) : 165-174. DOI: 10.11868/j.issn.1001-4381.2024.000315
研究论文

冷却介质温度对Ti65合金冷却曲线及显微组织的影响

作者信息 +

Effect of cooling medium temperature on cooling curve and microstructure of Ti65 alloy

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摘要

高温热处理后冷却速率对Ti65合金组织性能影响显著。本工作系统研究了冷却介质温度对Ti65合金高温热处理后冷却曲线及显微组织的影响规律。结果表明,在油和空气两种冷却介质条件下,介质温度变化对冷却速率曲线的影响规律相反:室温条件下,油淬最大冷却速率为73.2 ℃/s,而空冷条件下的最大冷却速率仅为11.2 ℃/s;随着温度升高,油淬冷却速率曲线右移,最大冷却速率和最低膜沸腾温度提高;室温至60 ℃范围内,油淬的冷却速率曲线包含蒸气膜、沸腾和对流三个阶段;油温升至80 ℃时,油淬冷却速率曲线的蒸气膜阶段消失;随油温升高,显微组织呈现α+β两相组织向马氏体组织转变的趋势。与之相反的是,随温度升高,空冷的冷却速率曲线左移,最大冷却速率减小,沸腾阶段最大冷却速率对应的温度升高;相比于不同温度油淬,不同温度空冷条件下的显微组织为典型的双态组织且未见明显差异。油温对冷却曲线的影响主要归因于油黏度/流动性的变化,而空气温度对冷却曲线的影响主要归因于空气的密度和温度梯度等多个复杂因素。

Abstract

The cooling rate after high-temperature heat treatment has a significant effect on the microstructure and properties of Ti65 alloy. The effect of cooling medium temperature on the cooling curve and microstructure of Ti65 alloy after high-temperature heat treatment has been systematically studied. The results show that the temperature of the oil medium has an opposite effect on the cooling curve to that of the air medium. The maximum cooling rate of oil is 73.2 ℃/s at room temperature, while the maximum cooling rate of air cooling is only 11.2 ℃/s. As the temperature increases, the cooling rate curve for oil quenching condition shifts to the right, and the maximum cooling rate and the minimum film boiling temperature increase. When the oil temperature is in the range of room temperature to 60 ℃, the cooling rate curve for oil quenching condition includes vapor, boiling, and convection three stages. When the oil temperature rises to 80 ℃, the vapor stage disappears. In addition, the microstructure shows a transition trend from α+β dual-phase microstructure to martensitic microstructure with the increase in oil temperature. Conversely, with the temperature increases, the cooling rate curve for air cooling condition shifts to the left, the maximum cooling rate decreases, and the temperature at the maximum cooling rate in the boiling stage gradually increases. Compared with oil quenching at different temperatures, the microstructure of air cooling under different temperatures shows typical bimodal microstructure with no obvious difference. The effect of oil temperature on the cooling curve is mainly attributed to changes in oil viscosity and fluidity, while the effect of air temperature on the cooling curve is mainly attributed to multiple complex factors such as air density and temperature gradient.

关键词

Ti65钛合金 / 介质温度 / 冷却曲线 / 显微组织 / 最低膜沸腾温度

Key words

Ti65 titanium alloy / medium temperature / cooling curve / microstructure / minimum film boiling temperature

中图分类号

TB31 / TG166.5

引用本文

导出引用
董晓琳 , 李文渊 , 谭海兵 , . 冷却介质温度对Ti65合金冷却曲线及显微组织的影响. 材料工程. 2025, 53(1): 165-174 https://doi.org/10.11868/j.issn.1001-4381.2024.000315
Xiaolin DONG, Wenyuan LI, Haibing TAN, et al. Effect of cooling medium temperature on cooling curve and microstructure of Ti65 alloy[J]. Journal of Materials Engineering. 2025, 53(1): 165-174 https://doi.org/10.11868/j.issn.1001-4381.2024.000315

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基金

国家科技重大专项项目(J2019-Ⅵ-0012-0126)

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