Transactions of Materials and Heat Treatment

Title：Experimental research on thermal forming limit of TNW700

Authors： Liu Baosheng Wu Wei

Unit： Beijing Aviation Manufacture Technology Research Institute

KeyWords： titanium alloy TNW700 forming limit empirical model ductile fracture

ClassificationCode：

year,vol(issue):pagenumber：2015,40(10):20-23

Abstract：

Forming limit is commonly applied to evaluate sheet formability, which is usually expressed by forming limit diagram. TNW700 is a new titanium alloy used at high temperature, which serves at 500 ℃ for the long-time process and up to 700 ℃ for the instant time. Research on high temperature forming limit of TNW700 was carried out at 750, 800 and 850 ℃ by rigid tool bulging respectively. It is noted that the limit major strain ratios for plain strain condition at 800 and 850 ℃ are enhanced by 29.4% to 44.5% respectively compared with that at 750 ℃. The result shows that the forming limit increases with the increasing temperature. The displayed dimple occurs on the micro-fracture, which shows ductile fracture of TNW700. The parameters of FLD empirical model are determined based on the experimental data, so the calculated forming limit curve meets the experimental data well.

Funds：

中国航空研究院航空基金资助项目（201211250001）

刘宝胜（1979-），男，博士，工程师

Reference：

[1]丁华，薛松，张东，等. 基于拉伸试验的板料成形性能研究[J]. 锻压技术, 2013, 38 (2): 37-39.

Ding H，Xue S，Zhang D，et al. Study of sheet metal forming performance based on tensile test[J]. Forging & Stamping Technology, 2013, 38 (2):37-39.

[2]刘振勇, 李亚光, 李大永. 5754-H111铝合金板材成形极限实验及数值模拟[J]. 锻压技术，2014，39（1）：35-40.

Liu Z Y，Li Y G，Li D Y. Forming limit experiment and numerical simulation of 5754-H111 aluminum alloy sheet [J]. Forging & Stamping Technology，2014，39（1）：35-40.

[3]Hus E, Carsley J E, Verma R. Development of forming limit diagrams of aluminum and magnesium sheet alloys at elevated temperature[J]. Journal of Material Engineering and Performance, 2008, 17 : 288-296.

[4]Hasan R Z, Kinsey B L, Tsukrov I. Effect of element type on failure prediction using a stress-based forming limit curve[J]. J. Manuf. Sci. Eng., 2011, 133(6): 061002-061010.

[5]Marciniak Z, Kuczynski K. Limit strains in the processes of stretch-forming sheet metal[J]. International Journal of Mechanical Science， 1967, 7: 609-620.

[6]马高山, 万敏, 吴向东. 5A90铝锂合金热态下的成形极限图及其计算模型[J]. 中国有色金属学报, 2008, 18(4): 717-721.

Ma G S, Wan M, Wu X D. Forming limit diagram and calculating model for 5A90 Al-Li alloy sheet at elevated temperature[J]. The Chinese Journal of Nonferrous Metals, 2008, 18(4): 717-721.

[7]余心宏, 翟妮芝, 翟江波. 应用韧性断裂准则预测板料的成形极限图[J].锻压技术, 2007, 32(5): 44-47.

Yu X H, Zhai N Z, Zhai J B. Prediction of sheet metal forming limit diagram by applying ductile fracture criterion[J].Forging & Stamping Technology, 2007, 32(5): 44-47.

Service：

【This site has not yet opened Download Service】【Add Favorite】