Effects of Re-B modification on the strength and toughness of 30CrMn2Si cast steel
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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.
KeywordsPolymer Grain Size Microstructure Electron Microscopy Scanning Electron Microscopy
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- 1.Jing-Sheng Yu and Zong-Sen Yu, “The application of rare-earth in iron and steel” (Publishing Corporation of Metallurgy Industry, 1980) p. 13.Google Scholar
- 2.L. I. Wenchao, Military Equipment Mater. Mech. 4 (1984) 1.Google Scholar
- 3.Jian-An Wang. “Physical metallurgy and heat treatment” (Publishing Corporation of Mechanical Industry, 1980) 7.Google Scholar
- 4.Rui-Zhen and Han-Si Hu, “The application of rare-earth in iron and steel” (Publishing Corporation of Metallurgy Industry, 1980) p. 195.Google Scholar