超超临界火电机组用铁素体系耐热钢持久性能的预测方法

Forecast Method for Creep-rupture Property of Ferritic Heat Resistant Steel Used for Ultra Super-critical Thermal Power Generating Units

为了介绍几种目前比较常用的超超临界火电机组用新型铁素体系耐热钢持久性能的预测方法,对已有文献资料进行归纳总结,分析各种预测方法的特点及局限性。分析结果表明:等温线外推法将会严重高估新型铁素体系耐热钢的持久性能,时间-温度参数法则仍然适用;由于9%～12%(质量分数)Cr系耐热钢在长期的服役过程中显微组织演变明显,应使用多区时间-温度参数法;连续介质损伤力学(continuum damage mechanics,CDM)模型中的各个参数都有具体的物理含义,有着更大的发展空间和良好的应用前景。

In order to introduce forecast methods for creep-rupture property of typical ferritic heat resistant steel used for ultra super-critical thermal power generating units, the existing literature materials are summarized to analyze characters and limits of each method. The analysis result shows that isotherm method may overestimate creep-rupture property of new ferritic heat resistant steel and time-temperature parameter method may still be acceptable; for distinct microstructure evolution in 9%-12% （mass fraction） Cr heat resistant steel, the TTP can be used by multi-region analysis; parameters in continuum damage mechanics （CDM） model has specific physical meanings, so it has room for development and good application prospect.