新型奥氏体耐热钢Sanicro25（UNS S31035）适用于温度高达700℃的超超临界火电机组的高温构件——过热器和再热器管等，其蠕变寿命的预测对电厂的生产安全具有一定的理论和现实意义。基于Sanicro25钢在700℃以上三个温度和四个应力水平下的蠕变试验数据以及Sandviken公司的蠕变试验数据，分别求取基于时间温度参数法的Manson-Harferd（MH）模型、基于蠕变损伤力学的改进的Kachanov-Rabotnov（KR）模型，以及基于幂律蠕变控制孔洞长大理论的蠕变延性模型的参数，利用外推法和有限元模拟技术，获得了700℃以上的基于三个本构模型的时间-应力曲线，并分析探讨三个本构模型对Sanicro25钢的长时低应力下的蠕变寿命的预测效果。研究发现，在温度高达700℃以上时，蠕变延性模型更加适用于Sanicro25钢的长时蠕变寿命的预测。
荆洪阳
,
孟珊
,
赵雷
,
韩永典
,
徐连勇
. Sanicro25奥氏体耐热钢高温蠕变寿命的预测[J]. 机械工程学报, 2018
, 54(12)
: 165
-172
.
DOI: 10.3901/JME.2018.12.165
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℃.
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