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| Effect of Mn content on microstructure, tensile and impact properties of SA508Gr.4N steel for reactor pressure vessel |
| Xi‑kou He1, Zhi‑qiang Yang2, Zhen Wang1, Shi‑bin Qiao1, Zheng‑dong Liu1 |
| 1 Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China; 2 Technology Center of Ma’anshan Iron and Steel Co., Ltd., Ma’anshan 243000, Anhui, China |
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Abstract The effect of manganese (Mn) on the microstructure, tensile and impact properties of SA508Gr.4N steel has been experimentally investigated. The influence of Mn content on the substructure of SA508Gr.4N steel was investigated using the scanning electron microscope, electron back-scattered diffractometer and transmission electron microscope. It was found that the increased Mn content had a beneficial effect on both strength and toughness. Examination of microstructure revealed smaller size of block and larger number of high-angle grain boundaries with higher Mn content. The change of the ultimate tensile strength and toughness with increasing Mn content was attributed to the increased hardenability, the number of high-angle grain boundaries and the crack propagation path by the block refining.
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| Cite this article: |
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Xi‑kou He,Zhi‑qiang Yang,Zhen Wang, et al. Effect of Mn content on microstructure, tensile and impact properties of SA508Gr.4N steel for reactor pressure vessel[J]. Journal of Iron and Steel Research International, 2020, 27(4): 461-470.
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2020, Vol. 27 
