Effects of Re-B modification on the strength and toughness of 30CrMn2Si cast steel |
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Authors: | Yan -Pei Song Quan -Shun Luo Quan -De Chen Yun -Gui Chen |
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Affiliation: | (1) Department of Material, Luoyang Institute of Technology, Henan, P. R. China |
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Abstract: | The effects of multi-modification on the strength and toughness of 30CrMn2Si cast steel were investigated. The mechanical properties tested include tensile strength; Charpy impact toughness from room temperature to –60 °C; hardness and fracture toughness. Microanalyses were carried out by optical microscopy, transmission electron microscopy, scanning electron microscopy, and X-ray diffraction, and included the microstructure and submicrostructure of martensites, residual austenites, the size and distribution of non-metallic inclusions, and the original austenite grain size. It was concluded that, with the hardness unchanged, the fracture toughness of the modified steel was raised to 95 MPa m1/2, 34% more than that of the un-modified steel, and the impact toughnesses at normal and low temperatures raised to 62 and 61.2 J cm-2, respectively, 67 and 75% more than those of the un-modified steel. Furthermore, the fracture strength and yield strength of the steel were increased by over 200 MPa. |
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