scholarly journals Identification of the Constitutive Model Parameters by Inverse Optimization Method and Characterization of Hot Deformation Behavior for Ultra-Supercritical Rotor Steel

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1958
Author(s):  
Xuewen Chen ◽  
Yuqing Du ◽  
Kexue Du ◽  
Tingting Lian ◽  
Bingqi Liu ◽  
...  

X12 (X12CrMoWVNbN10-1-1) ferritic heat resistant steel is an important material for the production of new-generation ultra-supercritical generator rotors. Hot compression tests of X12 ferritic heat-resistant steel were performed via a Gleeble-1500D testing machine under temperatures of 1050–1250 °C and strain rates of 0.05–5 s−1. In order to provide material model data for finite element simulations and accurately predict the hot deformation behavior, a reverse optimization method was proposed to construct elevated temperature constitutive models of X12 ferritic heat-resistant steel in this paper, according to the Hansel–Spittel constitutive model. To verify the accuracy of the model, the predicted and experimental values of the constitutive model were compared. The results indicated that the model had a high prediction accuracy. Meanwhile, the correlation coefficient between the experimental value and the predicted value of constitutive model was 0.97833. For further verification of the accuracy of the model, it was implemented in finite element FORGE@ software to simulate the compression tests of different samples under different conditions. Comparing actual displacement–load curves with displacement–load curves acquired through finite element simulations, the results indicated that displacement–load curves predicted by the model were very consistent with actual displacement–load curves, which verified the accuracy of the model. Moreover, to research the optimal processing parameters of the material, hot processing maps were drawn according to the dynamic material model. In terms of microstructure evolution, a characteristic area distribution map of the hot processing map was established. Therefore, the optimal hot forming parameters regions were in the range of 1150–1200 °C/0.05–0.62 s−1 for X12 ferritic heat-resistant steel.

2010 ◽  
Vol 17 (2) ◽  
pp. 167-172 ◽  
Author(s):  
Shu-ping Tan ◽  
Zhen-hua Wang ◽  
Shi-chang Cheng ◽  
Zheng-dong Liu ◽  
Jie-cai Han ◽  
...  

2014 ◽  
pp. 357-363
Author(s):  
Wang Jingzhong ◽  
Wang Kuaishe ◽  
Du Zhongze ◽  
Liu Zhengdong ◽  
Baohansheng

2015 ◽  
pp. 357-363
Author(s):  
Wang Jingzhong ◽  
Wang Kuaishe ◽  
Du Zhongze ◽  
Liu Zhengdong ◽  
Baohansheng

2013 ◽  
Vol 20 (9) ◽  
pp. 73-79 ◽  
Author(s):  
Peng Yan ◽  
Zheng-dong Liu ◽  
Wei Liu ◽  
Han-sheng Bao ◽  
Yu-qing Weng

Vacuum ◽  
2019 ◽  
Vol 165 ◽  
pp. 324-336 ◽  
Author(s):  
Zhongman Cai ◽  
Hongchao Ji ◽  
Weichi Pei ◽  
Xuefeng Tang ◽  
Xiaomin Huang ◽  
...  

2016 ◽  
Vol 853 ◽  
pp. 163-167
Author(s):  
Fa Cai Ren ◽  
Xiao Ying Tang

Creep deformation behavior of SA387Gr91Cl2 heat-resistant steel used for steam cooler has been investigated. Creep tests were carried out using flat creep specimens machined from the normalized and tempered plate at 973K with stresses of 100, 125 and 150MPa. The minimum creep rate and rupture time dependence on applied stress was analyzed. The analysis showed that the heat-resistant steel obey Monkman-Grant and modified Monkman-Grant relationships.


2007 ◽  
Vol 345-346 ◽  
pp. 169-172
Author(s):  
Min Soo Kim ◽  
Hyong Jik Lee ◽  
Young Won Chang

The effect of Mn/S ratio on hot ductility of Bi bearing steels has been investigated at the temperatures ranging from 950 to 1250. The hot ductility, measured as the reduction ratio of area, was found to depend on the Mn/S ratio and test temperature to provide the largest hot ductility at the ratio of 3.903 at 1200 . The hot workability of Bi bearing free cutting steels seems to depend greatly on the size, volume fraction, and type and distribution of inclusions. In addition, hot deformation behavior of Bi bearing free cutting steel has also been characterized by constructing a processing map developed on the basis of the dynamic material model. A series of hot compression tests has been carried out at the temperatures ranging from 950 to 1250 under the strain rate ranging from 10-3 /s to 102 /s.


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