摘要
通过对宝钢生产的T23钢在550、600、650℃的持久试样的微观组织分析,研究了T23钢高温蠕变过程中的组织演变对性能的影响。发现了T23钢高温蠕变过程中贝氏体铁素体基体和小岛中的马氏体将回复、再结晶,位错密度下降,M23C6碳化物不断粗化,并且有少量M23C6转变为M6C。蠕变断裂时间较短时,M23C6碳化物的粗化对性能退化起主要作用,随着时间延长,贝氏体铁素体基体和小岛中的马氏体的回复、再结晶的影响增大。温度较高,回复、再结晶开始较早,对性能退化的影响提前。T23钢在650℃组织演变和性能下降过快,应尽量避免使用。
The effect of microstructural evolution of Baosteel＇s T23 heat-resistant steel on its properties has been studied through analyzing its sample＇ s microstructure at 550℃, 600℃ and 650℃. It was found that in the steel creep process at high temperatures, the bainitic ferrite matrix and the martensite in the carbon-rich islands would be recovered and recrystallized. The dislocation density would be smaller, M23C6 carbides would become coarser, and small portion of M23C6 would turn to M6C. If the creep rupture time is short, the coarsening of M23C6 would play a major role in steel＇ s property degradation. If the creep continues, the effect of the recovery and recrystallization of the bainitic ferrite matrix and the martensite in the carbon-rich islands will be bigger. If the temperature is higher, the recovery and recrystallization will begin earlier, and the effect on the property degradation will be quickened. T23 heatresistant steel should not be used at 650℃, since at that temperature, the steel＇ s microstrnctural evolution and property degradation will be too fast.
出处
《宝钢技术》
CAS
2006年第3期18-22,共5页
Baosteel Technology
关键词
T23钢
蠕变断裂
微观组织
性能退化
T23 steel
creep rupture
microstructure
property degradation
