The fracture morphology of creep rupture tested samples and microstructural evolution was investigated at 600℃, and the creep rupture mechanism of a T23 steel used for ultra-supercritcal power generations was discussed under different stress levels. The results show that, under condition of high stress level, the creep rupture mechanism is similar to the ductile fracture at room temperature, and the cavities nucleate mostly at sites of the inclusions, behaving intragranular fracture. However, under low stress level, the creep rupture mechanism is brittle fracture occurred along the grain boundary, and the cavities nucleate mostly at sites of the second-phases, behaving intergranular fracture.
Key words
T23 steel /
rupture analysis /
microstructural evolution /
creep rupture mechanism
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1]Bendick W,Gabrel J,Hahn B,et al.New low alloy heat resistant ferritic steels T/P23 and T/P24 for power plant application[J].International Journal of Pressure Vessels and Piping,2007,84:13-20
[2]杨富,章应霖,任永宁,等.新型耐热钢焊接[J].中国电力出版社,2009,:-
[3]钟群鹏,赵子华.断口学[J][J].高等教育出版社,2006,:-
[4]Dimmler G,Weinert P,Cerjak H.Extrapolation of short-term creep rupture data-the potential risk of over-estimation[J].International Journal of Pressure Vessels and Piping,2008,85:55-
[5]涂善东,轩福负,王卫泽.高温蠕变与断裂评价的若干关键问题[J].金属学报,2009,45(7):781-
[6]. Specification for seamless ferritic and austenitic alloy-steel boiler,superheater,and heat-exchanger tubes,2006[J][J].ASTM: A 213/A 213M,2006,:-
[7]张俊善.材料的高温变形和断裂[J].北京: 科学出版社,2007,:-
{{custom_fnGroup.title_en}}
Footnotes
{{custom_fn.content}}