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利用扫描电镜(SEM)、透射电镜(TEM)等实验方法,研究了回火温度500～650℃对X120管线钢组织和性能的影响。运用Ashby-Orowan修正模型等强化理论分析了X120管线钢回火工艺的强化机理。结果表明:回火温度对屈服强度和抗拉强度均有较大影响,回火后实验钢屈服强度分别在回火温度为550℃和600℃出现两个峰值,抗拉强度在600℃时出现峰值,伸长率略有升高,屈强比升高。分析认为:回火过程中实验钢性能的变化是由析出强化、位错强化、固溶强化等强化机理共同作用造成的。
The effects of tempering temperature from 500 ℃ to 650 ℃ on the microstructure and properties of X120 pipeline steel were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The strengthening mechanism of tempering process of X120 pipeline steel was analyzed by using the reinforcement theory such as Ashby-Orowan modified model. The results show that the tempering temperature has a great influence on the yield strength and tensile strength. After tempering, the yield strength of the experimental steel shows two peaks at the tempering temperature of 550 ℃ and 600 ℃, respectively. The tensile strength of the steel at 600 ℃ Peak, elongation slightly increased, yield ratio increased. The analysis shows that the change of the properties of experimental steel during tempering is caused by the strengthening action of precipitation strengthening, dislocation strengthening and solid solution strengthening.