Abstract
常规时间-温度参数法(TTP),如Larson-Miller Parameter(LMP)参数法以及Orr-Sherby-Dorn(OSD)方法对9%—12%Cr铁素体耐热钢进行持久性能预测时存在性能过估,且预测值与实测值之间存在明显差异,本文提出了LMP的分区及其C值优化,以及基于短时实验数据(≤5×10^3h)预测长时(5×10^3—1×10^5h)持久性能的方法.利用已有的持久性能数据,应用所提出的方法进行了应力与持久断裂时间及其相关参量的计算、作图及其比较.结果表明,单区LMP方法的C值随钢种而异;多区LMP方法的C值随钢种及实验应力区而异;基于短时实验数据(≤5×10^3h)预测长时(5×10^3—1×10^5 h)持久性能的预测值与实测值吻合;d[g(σ)]/d(P)随P的变化率可反映不同钢种持久性能的稳定性;LMP分区法及预测函数优化法的计算值与实测值的吻合性很好并进一步克服了利用给定温度下短时持久实验数据外推长时持久性能的过估倾向.
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