断裂力学在转化管剩余寿命预测中的应用

Application of Fracture Mechanics to Prediction of Residual Life of Reformer Tube

在８３０～１０００°Ｃ温度和３．３～７．８ ＭＰａｍ初始应力强度因子下研究了运 行８１ ０００ ｈ的ＨＫ ４０转化管的蠕变裂纹扩展行为，由裂纹扩展速率与温度的Ａｒｒｈｅｎｉｕｓ 关系和裂纹扩展速率与断裂时间的反比关系导出Ｌａｒｓｏｎ－Ｍｉｌｌｅｒ参数（Ｐ），从而建立 了初始应力强度因子（Ｋｒｒ）和 Ｌａｒｓｏｎ－Ｍｉｌｌｅｒ参数关系外推寿命的方法．

The creep crack growth behavior of HK40 reformer tube that has serviced for 81 000 hours has been studied in the temperature range of 830 to 1 000 C and in the initial stress intensity factor range of 3.3 to 7.8 MP.am1/2. According to the Arrhenius relation of crack growth rate with temperature and the inversely proportional relation of crack growth rate with rupture time, Larson-Miller parameter is derived. A method ext-roplating residual life by the relation of initial stress intensity factor with Larson-Miller parameter(P) is propose.