摘要
通过分析T23钢常规组织状态及其在550℃、600℃、650℃高温持久试样的微观组织,研究了T23钢高温蠕变过程中的组织演变及对性能的影响。结果表明,蠕变断裂过程中,MX稳定性较好,但M7C3数量逐渐减少,M23C6聚集、长大,并且有少量M23C6转变为M6C;贝氏体铁素体基体和奥氏体小岛中的马氏体不断回复、再结晶,位错密度下降。认为温度越高,组织演变进程越快,性能退化越明显。
The specimens before and after crept at 550 ℃,600 ℃and 650 ℃ were chosen to study the mierostructural evolution and the effect on the properties of domestic T23 steel. During creep, there is no obvious change of MX, while MTCa carbides disappear and M23C6 carbides coarsen gradually, even a few M23C6 carbides transform to M6C. Furthermore dislo cation density decreases dues to the recovery and recrystallization of the bainitic ferrite matrix and the martensite in the prior austenite small island. The higher temperature is , the quicker mierostructural evolution becomes, and the more property degradation is.
出处
《锅炉技术》
北大核心
2006年第2期17-20,70,共5页
Boiler Technology
基金
上海市科学技术委员会资助(035211025)
上海市教委发展基金资助
