Creep-rupture Time Prediction of Sanicro25 Austenitic Heat Resistant Steel at Elevated Temperature

doi:10.3901/JME.2018.12.165

Abstract

Abstract: The new austenitic heat resistant steel Sanicro25(UNS S31035) is a promising candidate boiler material for elevated temperature components, e.g. superheater and reheater tube of advanced ultra-supercritical coal-fired power plants with temperature up to 700℃. The prediction of their creep rupture time has a certain theoretical and practical significance for the production safety of power plants. Based on the creep test data of Sanicro25 steel at three temperatures above 700℃ and four stress levels and Sandviken's creep test data, the parameters of the Manson-Halferd (MH) model which is based on time temperature parameter method (TTP), the improved Kachanov-Rabotnov (KR) model which is based on creep damage mechanics and creep ductility model which is based on the power-law creep controlled cavity growth theory are calculated. The time-stress curves above 700℃ of three constitutive models are obtained by the extrapolation method and finite element simulation technique. The prediction effect of three constitutive models on the creep rupture time of Sanicro25 steel under long-term and low stress is analyzed. It is found that the creep ductility model is more suitable for predicting the long-term creep rupture time of Sanicro25 steel at temperatures above 700℃.

Key words: constitutive model, creep, creep ductility model, finite element simulation, rupture time prediction

CLC Number:

TH142

JING Hongyang, MENG Shan, ZHAO Lei, HAN Yongdian, XU Lianyong. Creep-rupture Time Prediction of Sanicro25 Austenitic Heat Resistant Steel at Elevated Temperature[J]. Journal of Mechanical Engineering, 2018, 54(12): 165-172.

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