Creep and fracture behaviors of an advanced heat resistant austenitic stainless steel for A-USC power plant
Creep and fracture behaviors in a newly developed austenitic stainless steel grade UNS S31035 (Sandvik Sanicro(R) 25) for use in A-USC power plant have been investigated. This new grade shows very good resistances to steam oxidation and hot corrosion, and higher creep rupture strength than other austenitic stainless steels available today. This makes it an interesting alternative for super-heaters and reheaters in future high-efficient coal fired boilers. This paper will mainly focus on the study of the creep and fracture behaviors of the material at temperatures from 600℃ to 750℃ by using SEM and TEM. The creep and fracture mechanisms at different temperature and loading conditions have been identified. The interactions between dislocations and precipitates and their contribution to the creep rupture strength have been discussed. In this paper, free temperature model has been used to evaluate the long-term creep behavior of the grade. A creep rupture strength near 100MPa at 700℃ for 100 000h has been predicted.
Heat resistant austenitic stainless steel Superheater A-USC Creep Fracture
Guocai Chai Patrik Kjellstr(o)m Magnus Bostr(o)m
Strategy Research,Sandvik Materials Technology,81181 Sandviken,Sweden;Engneering Materials,Link(o)pi Strategy Research,Sandvik Materials Technology,81181 Sandviken,Sweden
国际会议
北京
英文
1-9
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）