
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
冷却介质温度对Ti65合金冷却曲线及显微组织的影响
Effect of cooling medium temperature on cooling curve and microstructure of Ti65 alloy
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。
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.
Ti65钛合金 / 介质温度 / 冷却曲线 / 显微组织 / 最低膜沸腾温度
Ti65 titanium alloy / medium temperature / cooling curve / microstructure / minimum film boiling temperature
TB31 / TG166.5
[1] |
|
[2] |
|
[3] |
王清江,刘建荣,杨锐 .高温钛合金的现状与前景[J].航空材料学报,2014,34(4):1-26.
|
[4] |
弭光宝,谭勇,陈航,等 .增材制造600 ℃高温钛合金研究进展[J].航空材料学报,2024,44(1):15-30.
|
[5] |
|
[6] |
|
[7] |
|
[8] |
|
[9] |
胡明,邱建科,雷晓飞,等 .高强TB9钛合金次生α相析出行为及力学性能[J].航空材料学报,2024,44(2):159-168.
|
[10] |
刘倩倩,杨啸雨,高帆,等 .TiZrAlHf钛基中熵合金热变形及组织演变规律[J].材料工程,2024,52(1):128-136.
|
[11] |
|
[12] |
|
[13] |
|
[14] |
|
[15] |
|
[16] |
于程歆,刘林 .淬火冷却技术及淬火介质[M].沈阳:辽宁科学技术出版社,2010.
|
[17] |
|
[18] |
|
[19] |
周澍,陈乃录,张伟民,等 .水在不同温度和流速下冷却能力的测量[J].金属热处理,2008(6):69-72.
|
[20] |
|
[21] |
|
[22] |
刘玉,李玥 .淬火换热系数的计算及实验验证[J].材料热处理学报,2023,44(11):192-199.
|
[23] |
|
[24] |
夏立芳 .金属热处理工艺学(修订版)[M].哈尔滨:哈尔滨工业大学出版社,2008.
|
[25] |
杨桂生,刘麦秋,胡绍文 .淬火油的冷却性能[J].热处理技术与装备,2007(3):29-34.
|
[26] |
徐建伟,纪晓宇,田胜利,等 .TC17钛合金在连续冷却过程中的组织析出特征[J].稀有金属,2024,48(3):317-324.
|
[27] |
|
[28] |
谭海兵,臧健,梁弼宁,等 .中温热处理对Ti65合金淬火组织及室温拉伸性能的影响[J].材料研究学报,2023,37(12):881-888.
|
[29] |
|
[30] |
|
[31] |
|
/
〈 |
|
〉 |