Limits...
On the constitutive model of nitrogen-containing austenitic stainless steel 316LN at elevated temperature.

Zhang L, Feng X, Wang X, Liu C - PLoS ONE (2014)

Bottom Line: 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 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.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Tsinghua University, Beijing, China.

ABSTRACT
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.

Show MeSH

Related in: MedlinePlus

Linear regression fits of (a) ln (sinh ασ)-ln  and (b) ln (sinh ασ)-1/T.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4222771&req=5

pone-0102687-g005: Linear regression fits of (a) ln (sinh ασ)-ln and (b) ln (sinh ασ)-1/T.

Mentions: By substituting the values of the flow stress and corresponding strain rate at a strain of 0.2 for all the deformation temperatures into Eq. (9), the relationship between ln (sinh ασ) and –ln for a particular temperature can be obtained. These curves are shown in Fig. 5a. The value of n can be easily derived as the average of regression line slopes, giving n = 5.9029. For a particular strain rate, differentiating Eq. (9) leads to


On the constitutive model of nitrogen-containing austenitic stainless steel 316LN at elevated temperature.

Zhang L, Feng X, Wang X, Liu C - PLoS ONE (2014)

Linear regression fits of (a) ln (sinh ασ)-ln  and (b) ln (sinh ασ)-1/T.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4222771&req=5

pone-0102687-g005: Linear regression fits of (a) ln (sinh ασ)-ln and (b) ln (sinh ασ)-1/T.
Mentions: By substituting the values of the flow stress and corresponding strain rate at a strain of 0.2 for all the deformation temperatures into Eq. (9), the relationship between ln (sinh ασ) and –ln for a particular temperature can be obtained. These curves are shown in Fig. 5a. The value of n can be easily derived as the average of regression line slopes, giving n = 5.9029. For a particular strain rate, differentiating Eq. (9) leads to

Bottom Line: 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 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.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Tsinghua University, Beijing, China.

ABSTRACT
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.

Show MeSH
Related in: MedlinePlus