Prediction of Long-Term Creep Rupture Life of Grade 122 Steel by Multiregion Analysis
Prediction of Long-Term Creep Rupture Life of Grade 122 Steel by Multiregion Analysis
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DOI：
10.1115/1.4028203
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发表时间：
2015-04
影响因子：
1
通讯作者：
K. Maruyama;J. Nakamura;K. Yoshimi
中科院分区：
文献类型：
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作者：
K. Maruyama;J. Nakamura;K. Yoshimi
传统的时间-温度-参数(TTP)方法往往高估了蠕变强度增强铁素体钢的长期持久寿命。长期蠕变断裂寿命激活能Q的降低是高估的原因，因为TTP方法不能处理Q的变化。Gr.122钢的蠕变断裂数据(长达26,200h)被分成几个数据集，使得Q在每个分割的数据集中是唯一的。然后对每个划分的数据集应用TTP方法进行断裂寿命预测。这是蠕变断裂数据的多区域分析过程。预测的断裂寿命在文献中已有报道。钢的长期断裂寿命(最高可达51,400小时)已于2013年公布。蠕变断裂寿命的多区域分析可以较好地预测已报道的长期寿命。断裂寿命的应力和温度依赖关系在不同的加热条件下表现出相似的行为。因此，该钢种不同炉次的多区域分析结果数据库有助于估算另一炉次的断裂寿命。
Conventional time-temperature-parameter (TTP) methods often overestimate long-term rupture life of creep strength enhanced ferritic steels. Decrease in activation energy Q for rupture life in long-term creep is the cause of the overestimation, since the TTP methods cannot deal with the change in Q. Creep rupture data of a heat of Gr.122 steel (up to 26,200 h) were divided into several data sets so that Q was unique in each divided data set. Then a TTP method was applied to each divided data set for rupture life prediction. This is the procedure of multiregion analysis of creep rupture data. The predicted rupture lives have been reported in literature. Long-term rupture lives (up to 51,400 h) of the same heat of the steel have been published in 2013. The multiregion analysis of creep rupture life can predict properly the long-term lives reported. Stress and temperature dependences of rupture life show similar behavior among different heats. Therefore, database on results of the multiregion analyses of various heats of the steel is helpful for rupture life estimation of another heat.