【摘要】 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。更多还原

【Abstract】 Microstructure and properties of a hot rolled Mn-Ti steel under ultra fast cooling plus laminar cooling process were investigated. The results show that yield and tensile strength of the steel increase first and then decrease with the increasing of ultra-fast cooling inlet temperature,and the yield and tensile strength of steel decrease first and then increase with the decreasing of laminar cooling outlet temperature. The yield strength,tensile strength and elongation of the steel are 675 MPa,737. 5 MPa and 20%,respectively,and good mechanical properties are obtained when the ultra-fast cooling inlet temperature,ultra fast cooling outlet temperature and laminar cooling outlet temperature are 830,699 and 620 ℃,respectively. The microstructure of the steel is mainly composed of ferrite and a large number of precipitates in the ferrite matrix,and the amount of precipitation strengthening is about 190 MPa. The strengthening of grain refinement and precipitation strengthening effectively improve the mechanical properties of the steel.更多还原