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| Hot deformation behavior and constitutive equations of an advanced fourth generation powder metallurgy superalloy |
| HOU Qiong1，2，TAO Yu1，2，JIA Jian1，2，ZHANG Guo-dong3，QU Jing-long1，2 |
| 1High Temperature Materials Research Institute, CISRI, Beijing 100081, China，2 GAONA Aero Material Co., Ltd., Beijing 100081, China，3AECC Commercial Aircraft Engine CO., LTD., Shanghai 200241, China |
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Abstract The hot deformation behavior of a fourth generation powder metallurgy (PM) superalloy was investigated by using a Gleeble-3800 simulator over the deformation temperature range of 1 060~1 140 ℃ and strain rate range of 0.001~1 s-1 with a true strain of 0.69. The results show that the flow stress curves of the alloy exhibits dynamic recrystallization future. Based on the hyperbolic sine Arrhenius-type model and experimental data, two kinds of constitutive equations are established by using peak stress and considering the influence of strain. The predicted flow stress values calculated by employing the latter one are consistent with the actual experimental values, with a low average absolute relative error of 7.875 38%. Thus, the developed constitutive model with a strain modification can be adopted to describe the hot deformation behavior of the alloy and provide references for the design and optimization of hot working.
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Received: 09 October 2018
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2020, Vol. 30 
