不同等温锻TA15钛合金试验件的组织与力学性能研究
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摘要
研究了不同等温锻工艺对TA15等温锻试验件组织和力学性能的影响规律。结果表明,先采用950℃等温锻造、空冷,然后再进行975℃等温锻、快冷工艺,试验件中初生α相含量约15%,且还有细小的β转变基体和薄片状α此种组织在不降低塑性下具有较高的室温和高温强度,横、纵向性能相差也较小,完全满足锻件要求,故选用该工艺作为等温锻工艺。
The effects of different isothermal forging process on the microstructure and mechanical properties of TA15 isothermal forging test pieces were studied. The results show that the primary α phase content of the test piece is about 15%,and it has fine β-transformation matrix and thin slice α, by isothermal forging at 950 ℃, air cooling and then isothermal forging at 975 ℃, rapid cooling. This kind of microstructure has high strength at room temperature and high temperature without reducing plasticity, and the difference of transverse and longitudinal properties is also small, which fully meets the requirements of forgings. So this process is chosen as the process of isothermal forging.
The effects of different isothermal forging process on the microstructure and mechanical properties of TA15 isothermal forging test pieces were studied. The results show that the primary α phase content of the test piece is about 15%,and it has fine β-transformation matrix and thin slice α, by isothermal forging at 950 ℃, air cooling and then isothermal forging at 975 ℃, rapid cooling. This kind of microstructure has high strength at room temperature and high temperature without reducing plasticity, and the difference of transverse and longitudinal properties is also small, which fully meets the requirements of forgings. So this process is chosen as the process of isothermal forging.
引文
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[12]姚彭彭,李萍,李成铭,等. TA15钛合金β热变形行为及显微组织[J].稀有金属,2015,39(11):971-972.
[13]周义刚,曾卫东,俞汉青.近β锻造推翻陈旧理论发展了三态组织[J].中国工程科学,2001,3(5):63-65.
[2]黄德明,王怀柳,陈鑫,等. TA15合金大规格试制棒材的组织与性能[J].钢铁钒钛,2013,34(2):30-32.
[3]欧阳德来,鲁世强,黄旭,等. TA15合合金β区变形动态再结晶的临界条件[J].中国有色金属学报,2010, 20(8):1540-1543.
[4]周亮,段晓辉,周兴娜,等. TA15大规格棒材组织及性能改善的研究[J].中国钛业,2017(4):29-31.
[5]李渭清,马龙,高博,等.超大规格TA15棒材锻造工艺研究[J].中国钛业,2012(3):10-12.
[6]安耀辉,高博,马龙,等.超大规格TA15钛合金棒材锻造工艺研究[J].钛工业进展,2013,30(5):22-25.
[7]鲍里索娃.钛合金金相学[M].陈石卿,译.北京:国防工业出版社,1986:292.
[8]郭志军,王俭,任连保,等. Ti-6Al-2Zr-1Mo-1V合金厚板的组织性能[J].金属学报,2002,38(S1):168-187.
[9]李兴无,张庆玲,沙爱学,等.变形温度对TA15合金组织和性能的影响[J].材料工程,2004(1):8-11.
[10]张旺峰,曹春晓,李兴无,等.β热处理TA15钛合金对力学性能的影响规律[J].稀有金属材料与工程,2004,33(7):768-770.
[11]王金友.航空用钛合金[M].上海:上海科技出版社,1985:138.
[12]姚彭彭,李萍,李成铭,等. TA15钛合金β热变形行为及显微组织[J].稀有金属,2015,39(11):971-972.
[13]周义刚,曾卫东,俞汉青.近β锻造推翻陈旧理论发展了三态组织[J].中国工程科学,2001,3(5):63-65.