摘要
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 correlation among tempering temperature,microstructure and mechanical property of the X120 pipeline steel was investigated.Microstructure of the rolles steel tempered at different temperatures（500-650 ℃） was observed by scanning electronic microscopy（SEM） and transmission electronic microscopy（TEM）.The strengthening mechanism of X120 pipeline steel was studied by using a corrected Ashby-Orowan model.The results indicate that significant influence of tempering temperature on yield strength and tensile strength of the tempered X120 pipeline steel is observed.The supelrior mechanical properties are obtained for the steel tempered at 600 ℃ for 2 h.It is argued that the strengthening mechanism of the steel during tempering is the combination of precipitation strengthening,solid-solution strengthening and dislocation strengthening.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2012年第3期82-87,共6页
Transactions of Materials and Heat Treatment
