Influence of thermo-mechanical embrittlement processing on microstructure and mechanical behavior of a pressure vessel steel
作者： Xue Bai , Sujun Wu , Peter K. Liaw
DOI: 10.1016/J.MATDES.2015.10.024
关键词: Brittleness 、 Reactor pressure vessel 、 Nucleation 、 Materials science 、 Metallurgy 、 Transition temperature 、 Diffusion 、 Microstructure 、 Embrittlement 、 Pressure vessel
摘要: Abstract A thermo-mechanical embrittlement processing (TMEP) consisting of thermal aging and cold strain could cause the deterioration reactor pressure vessel (RPV) steels in form an increase ductile to brittle transition temperature (DBTT) a decrease upper-shelf energy (USE). In this study, TMEP was employed investigate microstructure evolution mechanical behavior SA508-IV steel. as-received state, Cr Mn atoms replace Fe alloying cementites, (Fe,Cr)3C (Fe,Mn)3C, through in-situ nucleation. Due slower diffusion coefficient, precipitates outer layer clusters. subsequent process, needle-shaped Mo2C, fine copper-rich (CRPs) P-rich are formed, which play great role evolution. Mechanical test results show that series changes occurred. It has been found DBTT fits linear function square root embrittling time at 520 °C (t 1/2) from 10 h 90 h degradation degree reaches saturation after 90 h.
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