锻压技术

基于Murty判据的TC4-DT合金加工图及失稳分析

英文标题：Processing drawing and flow instability analysis of TC4-DT titanium

作者：刘诚董洪波张贵华朱深亮余新平

单位：南昌航空大学

分类号：

出版年,卷(期):页码：2015,40(1):113-118

摘要：

采用Gleeble-3500 对TC4-DT钛合金进行等温恒应变速率压缩试验，研究了合金在温度920~1040 ℃、应变速率0.001~10 s-1热力参数范围内基于Murty判据的加工图，并分析了合金塑性流动失稳行为。结果表明，在试验参数范围内变形时存在较大区域的流动失稳，失稳区均出现在高应变速率下；得到两个适宜加工的热加工工艺参数匹配为：温度920~940 ℃、应变速率0.001~0.01 s-1和温度980~1040 ℃、应变速率0.001~0.09 s-1。分析了显微组织演变，发现在失稳区，合金失稳缺陷主要有局部流动和β晶粒变形不均匀；在稳定区，合金软化机制主要是动态再结晶。

Isothermal constant strain rate compression tests of TC4-DT titanium alloy on Gleeble-3500 were carried out. Processing map based on Murty criterion were researched within the temperature range 920-1040 ℃ and strain rate range 0.001-10 s-1,and the plastic flow instability behavior of alloy was analyzed. The results show that a large region of flow instability exists when titanium alloy deforms within the experimental parameters range, and the instability regions appear at high strain rate. Two appropriate deformation parameters are 920-940 ℃, 0.001-0.01 s-1 and 980-1040 ℃, 0.001-0.09 s-1. The microstructure evolution was analyzed that flow instabilities mainly include flow localization and non-uniform deformation of β grains in the instability region, otherwise the softening mechanism is mainly dynamic recrystallization in the stability region.

基金项目：

国家自然科学基金资助项目(51164029)

刘诚（1988-），男，硕士研究生

参考文献：

［1］朱知寿, 王新南, 童路, 等. 航空用损伤容限型钛合金研究与应用[J］.中国材料进展, 2010, 29(5):14-17.Zhu Z S, Wang X N, Tong L, et al. Research and application of damage tolerance titanium alloys for aeronautical use[J］. Materials China, 2010, 29(5): 14-17.

［2］王新南, 朱知寿, 童路,等. 锻造工艺对TC4-DT和TC21损伤容限型钛合金疲劳裂纹扩展速率的影响[J］. 稀有金属快报, 2008, 27( 7) : 12 -16.Wang X N, Zhu Z S, Tong L, et al. The influence of forging processing on fatigue crack propagation rate of damage tolerant titanium alloy[J］. Rare Metals Letters, 2008, 27( 7) : 12 -16.

［3］于兰兰, 毛小南, 李辉. 温度对 TC4-DT损伤容限型钛合金疲劳裂纹扩展行为的影响[J］. 稀有金属快报, 2007, 26(12):20-23.Yu L L, Mao X N, Li H. Effects of temperature on fatigue crack growth behavior of TC4- DT damage tolerance titanium alloy[J］. Rare Metals Letters, 2007, 26(12):20-23.
［4］Feng B X, Mao X N, Yang G J, et al. Residual stress field and thermal relaxation behavior of shot-peened TC4-DT titanium alloy [J］. Materials Science and Engineering A,2009，512( 1-2) : 105-108.

［5］Seshacharyulu T, Medeiros S C, Morgan J T, et al. Hot deformation and microstructural damage mechanisms in extra low interstitial (ELI) grade Ti-6Al-4V[J］. Materials Science and Engineering (A), 2000, 279: 289-299.

［6］唐泽, 杨合, 孙志超, 等. TA15钛合金高温变形微观组织演变分析与数值模拟[J］. 中国有色金属学报, 2008,18(4):722-726.Tang Z, Yang H, Sun Z C, et al. Microstructure evolution and numerical simulation of TA15 titanium alloy during hot compressive deformation[J］. The Chinese Journal of Nonferrous Metals, 2008, 18(4):722-726.

［7］Prasad Y V R K. Recent advances in the science of mechanical processing [J］. Indian Journal of Technology, 1990, 4:435-451.

［8］Prasad Y V R K, Seshacharyulu T. Processing maps for hot working of titanium alloys[J］. Materials Science and Engineering A, 1998, 243: 82-88.

［9］李鑫, 鲁世强, 王克鲁, 等. 应用Murty准则优化TC11钛合金高温变形参数[J］. 金属学报, 2007,43(12):1268-1274.Li X, Lu S Q, Wang K L, et al. Optimization of high temperature deformation parameters of titanium alloy TC11 by using murty criterion[J］. Acta Metallurgica Sinica, 2007, 43(12):1268-1274.

［10］Prasad Y V R K, Sastryd H, Deevi S C, et al. Processing maps for hot working of a P/M iron aluminide alloy[J］. Intermetallics, 2000, (8): 1067-1074.

［11］Murty S V S N, Rao B N, Kashyap B P. Instability criteria for hot deformation of materials[J］. International Materials Reviews, 2000, 45(1): 15-26.

［12］Murty S V S N, Rao B N. On the development of instability criteria during hot working with reference to IN 718[J］. Materials Science and Engineering A, 1998, 254:76-82.

［13］王克鲁, 鲁世强, 康永林, 等. Ti3Al 基合金的热变形行为及加工图[J］. 稀有金属材料与工程, 2011,40(9):1534-1538.Wang K L, Lu S Q, Kang Y L, et al. Deformation behavior and processing map of Ti3Al based alloy during the isothermal compression
［J］. Rare Metal Materials and Engineering, 2011, 40(9):1534-1538.

［14］于孟, 牛中杰, 毛江虹, 等. 不同应变及失稳准则Ti-50.9Ni合金加工图研究
［J］.稀有金属, 2013, 37(5): 702-707.Yu M, Niu Z J, Mao J H, et al. Processing maps of Ti-50.9Ni shape memory alloy under different strains and instability criteria
［J］.Chinese Journal of Rare Metals, 2013,37(5): 702-707.

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