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研究了超快冷+层流冷却工艺对一种Mn-Ti钢组织与性能的影响。结果表明:随入超快冷段温度的升高,实验钢的屈服强度和抗拉强度先升高后降低,随层流段出口温度的降低,其屈服强度和抗拉强度先降低后升高。当入超快冷段、出超快冷段及层流段出口的温度分别为830、699及620℃时,实验钢的屈服强度、抗拉强度及伸长率分别为675 MPa、737.5 MPa和20%,力学性能最佳,其组织以铁素体为主,在铁素体基体上存在大量的细小析出物,通过计算,其析出强化量为190 MPa,细晶强化及析出强化有效提高了实验钢的力学性能。
The effect of ultra-fast cooling and laminar cooling on microstructure and properties of a Mn-Ti steel was investigated. The results show that with the increase of temperature, the yield strength and tensile strength of the experimental steel first increase and then decrease. With the decrease of exit temperature, the yield strength and tensile strength of the experimental steel decrease first and then increase . The yield strength, tensile strength and elongation of the experimental steel were 675 MPa and 737.5 MPa, respectively, when the temperatures of the ultra-fast cooling section, the ultra-fast cooling section and the exit of the laminar flow section were 830, 699 and 620 ℃, respectively 20%, the best mechanical properties, the organization of ferrite-based, ferrite matrix in the presence of a large number of small precipitates, through the calculation, the precipitation strengthening amount of 190 MPa, fine grain strengthening and precipitation strengthening effectively improve Experimental steel mechanical properties.