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| Ti-5Al-5Mo-5V-1Cr-1Fe合金热加工图及其组织演变 | |
| 引用本文： | 祖利国,张晓泳,李超,周科朝,唐仁波.Ti-5Al-5Mo-5V-1Cr-1Fe合金热加工图及其组织演变[J].中南大学学报(自然科学版),2012,43(8):2943-2950. |
| 作者姓名： | 祖利国 张晓泳 李超 周科朝 唐仁波 |
| 作者单位： | 1. 中南大学粉末冶金国家重点实验室,湖南长沙,410083 2. 中南大学粉末冶金国家重点实验室,湖南长沙,410083;中南大学冶金科学与工程学院,湖南长沙,410083 3. 湖南金天钛业科技有限公司,湖南常德,415001 |
| 基金项目： | 国家自然科学基金委员会创新研究群体科学基金资助项目，湖南省科技重大专项，中南大学前沿研究计划项目，中南大学博士后基金资助项目 |
| 摘 要： | 采用热模拟试验机对Ti-5Al-5Mo-5V-1Cr-1Fe合金进行等温压缩试验,获得变形温度为750~900℃和应变速率为0.001~1 s 1时的真应力真应变曲线,并运用修正后的试验数据建立真应变为0.7的热加工图。通过显微组织观察,分析合金的变形机理,确定热变形失稳区。研究结果表明:Ti-5Al-5Mo-5V-1Cr-1Fe合金加工温度范围较宽,当加工温度低于800℃且变形速率大于0.1 s 1时易发生绝热剪切,造成流变失稳;随着变形温度升高,功率耗散因子η有增大趋势,合金的流动软化机制由动态回复逐渐变为动态再结晶,显微组织也随之细化、均匀。 |
| 关 键 词： | Ti-5Al-5Mo-5V-1Cr-1Fe合金 高温变形 加工图 显微组织 |
Hot processing map and microstructural revolution of Ti-5Al-5Mo-5V-1Cr- 1Fe alloy |
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| ZU Li-guo , ZHANG Xiao-yong , LI Chao , ZHOU Ke-chao , TANG Ren-bo.Hot processing map and microstructural revolution of Ti-5Al-5Mo-5V-1Cr- 1Fe alloy[J].Journal of Central South University:Science and Technology,2012,43(8):2943-2950. | |
| Authors: | ZU Li-guo ZHANG Xiao-yong LI Chao ZHOU Ke-chao TANG Ren-bo |
| Institution: | 1.State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China; 2.School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China; 3.Hunan Goldsky Titanium Industry Technology Co.Ltd,Changde 415001,China) |
| Abstract: | The hot deformation characteristics of Ti-5Al-5Mo-5V-1Cr-1Fe alloy were investigated between 750-900 ℃ and strain rate range of 0.01-1 s-1 through hot compression tests.The processing map at strain of 0.7 was given according to the corrected data of true stress-strain curves,and the microstructures of deformed specimens were observed.The region of deformation instability and deformation mechanism was abtained from the map.The results show that Ti-5Al-5Mo-5V-1Cr-1Fe alloy can be processed in a large temperature range,while adiabatic shear appears at relatively low temperature(<800 ℃) and high strain rate(>0.1 s-1).The power dissipation factor increases with the increase of the temperature,the deformation mechanism transforms from dynamic recovery to dynamic recrystallization,and the microscopic structure of the alloy is more uniform. |
| Keywords: | Ti-5Al-5Mo-5V-1Cr-1Fe alloy hot deformation processing map microstructure |
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