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影响因子：3.7

DOI码：10.1016/j.mtcomm.2022.105039

发表刊物：Materials Today Communications

项目来源：国家自然科学基金

关键字：Heat -resistant steel；Creep damage；Microstructure degradation；Potentiodynamic polarization

摘要：Using the electrochemical detection technique, this work dealt with the microstructure evolution during the creep of a modified 9Cr-1Mo (P91) heat-resistant steel. In order to prepare specimens with various degradation states, a series of interrupted creep tests was firstly carried out at 600 celcius with 165 MPa. Then, the electrochemical measurement and microstructure observation were employed to characterize the resultant degradation of crept specimens, respectively. The obtained results showed that the electrochemical parameters of critical passivation current density and self-corrosion current density are very sensitive to the microstructure evolution during creep of P91 steel. During the primary creep stage, the rapid decrease of both parameters occurs, mainly resulting from the remarkable decrease of mobile dislocation density. During the secondary and tertiary creep stages, however, above parameters monotonically increase under the combined action of precipitates and high angle grain boundaries (HAGBs). In addition, it is further suggested that based on this initial study, there may be scope to use electrochemical detection technology as a nondestructive tool to monitor microstructural evolution during creep.

论文类型：期刊论文

学科门类：工学

文献类型：J

卷号：34

页面范围：105039

是否译文：否

收录刊物：SCI