Parameter correlation of high-temperature creep constitutive equation for RPV metallic materials》.pdfVIP

Journal of Nuclear Materials 465 (2015) 196 e203 Contents lists available at ScienceDirect Journal of Nuclear Materials journal homepage: /locate/jnucmat Parameter correlation of high-temperature creep constitutive equation for RPV metallic materials * Lin-Jun Xie , Xin Ren, Ming-Xue Shen, Li-Qun Tu College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China a r t i c l e i n f o a b s t r a c t Article history: Constant-temperature and constant-load creep tests of SA-508 stainless steel were performed at six Received 8 December 2014 temperatures, and the creep behavior and properties of this material were determined. Constitutive Received in revised form models were established based on an isothermal creep method to describe the high-temperature creep 6 May 2015 behavior of SA-508. Material parameter k, stress exponent ns, and temperature exponent nt of the Accepted 11 May 2015 established constitutive models were determined through experimental data via numerical optimization Available online 9 June 2015 techniques. The relationship of k, n , and n was evaluated, and a new coefficient model of keT, n eT, n s t s t eT,