【摘要】 通过研究了含０．５２％Ｃ，２．８％Ｃｒ，１．５％Ｍｏ，０．５％Ｖ的中碳铸造空冷贝氏体钢，尺寸从１００ｍｍ×２００ｍｍ×１２０ｍｍ铸锭到１０ｍｍ×１０ｍｍ×５５ｍｍ冲击试样，空冷后都能获得以贝氏体为主的组织，其最佳热处理工艺为加热１０５０℃，保温４０ｍｉｎ，空冷淬火，再２００℃回火２ｈ，然后空冷，其冲击值可达２９．１５Ｊ／ｃｍ２，弯曲强度可达１１８１．８ＭＰａ，洛氏硬度达５９．２。更多还原

【Abstract】 An air cooled bainitic cast steel containing 0 52%C,2 8%Cr,1 5%Mo and 0 5%V has been developed.The microstructures of the 100 mm×200 mm×120 mm ingots and the 10 mm×10 mm×55 mm impact test specimens after air cooling are all mainly bainite.The optimum heat treatment is air cooling after heating at 1 050 ℃ for 40 min, followed by tempering at 200 ℃ for 2 h and air cool. After the heat treatment, the impact value, the bending strength, and the hardness of the steel are respectively 29 15 J/cm 2, 1 181 8 MPa and HRC59 2.更多还原