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Metals 2019, 9(2), 194; https://doi.org/10.3390/met9020194

Effects of Tempering Temperature on the Microstructure and Mechanical Properties of T92 Heat-Resistant Steel

1
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
2
School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
3
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
4
Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, China
*
Authors to whom correspondence should be addressed.
Received: 21 January 2019 / Revised: 1 February 2019 / Accepted: 3 February 2019 / Published: 7 February 2019
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Abstract

T92 heat-resistant steel is among the most promising candidate materials for structural components in the Generation IV (GEN-IV) reactors. The effects of tempering temperature on the microstructure and mechanical properties of the T92 steel were studied. The microstructural evolution of the T92 steel subjected to various temperatures of the tempering process were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and synchrotron radiation X-ray diffraction (SR-XRD). The mechanical properties of Vickers hardness, tensile test, and impact test were also investigated. The results showed that the grain size of the prior austenite does not significantly change during the tempering process, while the width of the martensite lath and the size of the carbide precipitates increased with increasing tempering temperature. The hardness and yield strength of the T92 steel decreased, and the plasticity and impact energy increased with increasing tempering temperature. Coarsening of the carbide precipitates during the tempering process was considered to be the dominant factor that reduced the yield strength in the T92 steel. View Full-Text
Keywords: T92 heat-resistant steels; tempering temperature; mechanical properties; strengthening effect; synchrotron radiation X-ray diffraction T92 heat-resistant steels; tempering temperature; mechanical properties; strengthening effect; synchrotron radiation X-ray diffraction
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Zhao, D.; Zhang, S.; Zhang, H.; Li, S.; Xiao, H.; Wang, Y.; Wang, X. Effects of Tempering Temperature on the Microstructure and Mechanical Properties of T92 Heat-Resistant Steel. Metals 2019, 9, 194.

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