首页|Investigation on Strengthening Mechanism of China Low-Activation Ferrite Steel upon Thermo-Mechanical Treatment
Investigation on Strengthening Mechanism of China Low-Activation Ferrite Steel upon Thermo-Mechanical Treatment
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The objective of this study was to investigate the influence of strengthening mechanisms on the high-temperature mechanical properties of China low-activation ferrite(CLF-1)steel,which underwent thermodynamic design and thermo-mechanical treatment(TMT).The microstructure characterization in the normalized and tempered condition and the TMT condition was carried out using optical microscopy,X-ray diffractometer,and scanning electron microscopy with electron backscatter diffraction.High-resolution transmission electron microscopy was employed to determine the crystallographic structures of precipitated phases.The results indicated that the addition of Ti led to an increase in the allocation of C in MC phase and an enhancement in the content of MC phase.Compared to CLF-P steel in the normalized and tempered condition,a 1.5-fold increase in dislocation density and an order of magnitude improvement in MX phase density were achieved after TMT.The formation of high-density nano-scale MC phases during TMT played a significant role in precipitation strengthening due to their favorable coherent relationship with the matrix and low interfacial free energy.The excellent high-temperature mechanical properties observed in CLF-P steel after TMT can be attributed to the combined effects of precipitation strength-ening,dislocation strengthening,and lath strengthening.
China low-activation ferrite(CLF-1)steelThermo-mechanical treatmentMC phaseCrystallographic structureStrengthening mechanism
Dongtian Yang、Liangyin Xiong、Hongbin Liao、Guoping Yang、Xiaoyu Wang、Shi Liu
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Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China
School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China
Center for Fusion Science,Southwestern Institute of Physics,Chengdu 610041,China
State Key Laboratory of Nuclear Physics and Technology,Peking University
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