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| Mechanical and fatigue properties of SA508-IV steel used for nuclear reactor pressure vessels |
| Xin Dai1, Yue-feng Chen1, Peng Wang2, Li Zhang1, Bin Yang1,2, Lian-sheng Chen3 |
| 1 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; 2 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China; 3 College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China |
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Abstract The mechanical and fatigue properties of SA508-IV steel with martensite and granular bainite, respectively, were studied. The mechanical tests results showed that the ultimate tensile strength and impact toughness of the specimen with martensite were 830 MPa and 158 J, respectively, and those of the specimen with granular bainite were 811 MPa and 115 J, respectively. The former had higher tensile strength and impact toughness than the latter. The impact tests results showed that the former belonged to typical dimple fracture, while the latter belonged to brittle fracture. The fatigue tests results showed that the fatigue life of the specimen with martensite was 2717 cycles, and that of the specimen with granular bainite was 1545 cycles under the strain amplitude of ± 0.45%. The specimen with martensite had fewer crack initiation points, narrower fatigue striations separation, and larger volume fraction of high-angle grain boundaries than the latter. The fewer crack initiation points meant fewer fatigue cracks, the narrower fatigue striations separation meant slower crack propagation rate, and the larger volume fraction of high-angle grain boundaries could more effectively hinder fatigue crack propagation. Based on these facts, the fatigue life of the specimen with martensite was higher than that of the specimen with granular bainite.
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| Cite this article: |
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Xin Dai,Yue-feng Chen,Peng Wang, et al. Mechanical and fatigue properties of SA508-IV steel used for nuclear reactor pressure vessels[J]. Journal of Iron and Steel Research International, 2022, 29(08): 1312-1321.
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2022, Vol. 29 
