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我所和各单位自行设计、研制的37SiMnCrNiMoV低合金超高强度钢,用于某工程配套的薄壁高压容器。经过设计单位和制造单位的反复试验,认为使用性能较稳定,耐压强度达到了设计的要求,并有足够的安全系数,基本上接近和达到世界同类型钢种的使用水平。然而进行断裂韧性的测定还是初次。 对该钢平面应变断裂韧性K_1c值的测定,是按照ASTME399—74标准,采用三点弯曲试验法进行的。初步探讨了不同回火温度对该钢断裂韧性的影响。同时采用三点弯曲法对该材材的疲劳裂纹扩张率da/dN进行
The 37SiMnCrNiMoV low-alloy ultra-high strength steel designed and developed by our institute and each unit is used for the thin-walled high-pressure vessel matched with an engineering project. After repeated design and manufacturing units of the trial, that the use of more stable performance, compressive strength to meet the design requirements, and have sufficient safety factor, basically close to and use of the same type of steel in the world. However, the determination of fracture toughness is still the first time. The determination of the plane strain fracture toughness K_1c of the steel was carried out according to the standard of ASTM E999-74 by three-point bending test. The effects of different tempering temperature on the fracture toughness of the steel were preliminarily discussed. At the same time using three-point bending method of the material fatigue crack growth rate da / dN