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本文为了发挥低碳马氏体这一组织状态的优越性,结合我国资源特点,在少用Ni和不用Co的条件下,研制成功了强韧配合与马氏体时效钢和HP-9Ni-4Co-20C钢相当的新型低碳马氏体型超高强度钢(25Si2Mn2CrNiMoVA)。文中系统地讨论了新钢种的组织结构对钢的强度、塑性、韧性(包括断裂韧性和夏比冲击韧性)、脆性转化温度、弯曲疲劳强度和疲劳裂纹扩展速率的影响。
In order to give play to the superiority of low-carbon martensite in this state of the organization, combined with the characteristics of our country’s resources, with the use of Ni and without Co, the successful development of a tough and maraging steel and HP-9Ni-4Co -20C steel equivalent of the new low carbon martensitic ultra-high strength steel (25Si2Mn2CrNiMoVA). The effects of the microstructures of the new steel grades on the strength, ductility, toughness (including fracture toughness and Charpy impact toughness), brittle transition temperature, flexural fatigue strength and fatigue crack growth rate are systematically discussed.