摘要
利用扫描电镜、背散射衍射显微镜、X射线衍射仪及拉伸试验机,研究了回火温度对高强度级别管线钢的微观结构及拉伸性能的影响。结果表明,随着回火温度升高,试验钢的微观组织由尺寸较小的粒状和针状贝氏体,向尺寸较大的多边形铁素体演变,α峰半高宽明显降低,位错密度降低。未回火、600℃和650℃回火后试验钢的小角度取向差占比比700℃回火的试验钢高。与未回火试验钢相比,回火后试验钢的强度发生断崖式降低,断裂总延伸率和均匀延伸率则呈现快速增加趋势。试验钢的强塑性由位错强化和细晶强化共同影响。
Effect of tempering temperature on the microstructure and tensile properties of high-strength pipeline steel was studied by means of a scanning electron microscope,backscattered diffraction microscope,X-ray diffractometer,and tensile testing machine.The results demonstrate that as the tempering temperature increases,the microstructure of the tested steel evolves from smaller granular and needle-like bainite to larger polygonal ferrite,the full width at half maximum of the α peak is significantly reduced,and the dislocation density decreases.The proportion of small angle misorientation in un-tempered,600 ℃,and 650 ℃ tempered tested steels is higher than that in 700 ℃ tempered tested steel.Compared with un-tempered tested steel,the strength of tempered tested steel experiences a cliff-like decrease,while the total elongation and uniform elongation show a rapid increase trend.The strength and plasticity of the tested steel are attributable to a synergistic effect of dislocation strengthening and fine-grain strengthening.
作者
刘洋
刘建宏
高泽
Liu Yang;Liu Jianhong;Gao Ze(Hebei Special Equipment Supervision and Inspection Institute,Qinhuangdao Hebei 066000,China)
出处
《金属热处理》
北大核心
2025年第5期242-247,共6页
Heat Treatment of Metals
基金
河北省市场监督管理局科技项目(2024ZC41)。
关键词
高强度管线钢
回火温度
微观组织
力学性能
high strength pipeline steel
tempering temperature
microstructure
mechanical properties
