On the constitutive model of nitrogen-containing austenitic stainless steel 316LN at elevated temperature.
The nitrogen-containing austenitic stainless steel 316LN has been chosen as the material for nuclear main-pipe, which is one of the key parts in 3rd generation nuclear power plants. In this research, a constitutive model of nitrogen-containing austenitic stainless steel is developed. The true stress-true strain curves obtained from isothermal hot compression tests over a wide range of temperatures (900-1250°C) and strain rates (10(-3)-10 s(-1)), were employed to study the dynamic deformational behavior of and recrystallization in 316LN steels. The constitutive model is developed through multiple linear regressions performed on the experimental data and based on an Arrhenius-type equation and Zener-Hollomon theory. The influence of strain was incorporated in the developed constitutive equation by considering the effect of strain on the various material constants. The reliability and accuracy of the model is verified through the comparison of predicted flow stress curves and experimental curves. Possible reasons for deviation are also discussed based on the characteristics of modeling process.
Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Tsinghua University, Beijing, China.
Lei
L
Zhang
Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Tsinghua University, Beijing, China.
Xiao
X
Feng
Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Tsinghua University, Beijing, China.
Xin
X
Wang
Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Tsinghua University, Beijing, China.
Changyong
C
Liu
D006358:Hot Temperature; D008422:Materials Testing; D009584:Nitrogen / Q000737:chemistry*; D013193:Stainless Steel / Q000737:chemistry*
C426023:austenitic steel; D013193:Stainless Steel; D009584:Nitrogen