论文部分内容阅读
应用扫描电镜(SEM)、拉伸试验、萃取复型和EBSD技术对实验室研制的X100管线钢在300、350和400℃卷取温度下的组织、力学性能、析出物状态和大小角度晶界进行了分析。结果表明:随着卷取温度的升高,X100管线钢强度降低,伸长率和冲击韧性上升,显微组织为针状铁素体(AF)、粒状贝氏体(GB)、板条贝氏体(LB)组织,M/A岛减少,析出物由铌、钛的碳、氮化物组成。结合轧后钢板的显微组织、力学性能分析,在300~350℃卷取试验钢的显微组织和力学性能可以达到X100级别管线钢的水平。
The microstructures and mechanical properties of X100 pipeline steel developed by the laboratory at 300, 350 and 400 ℃ coiling temperature were investigated by scanning electron microscopy (SEM), tensile test, extraction complexation and EBSD technique. Analyzed. The results show that with the increase of coiling temperature, the strength of X100 pipeline steel decreases, and the elongation and impact toughness increase. The microstructure is acicular ferrite (AF), granular bainite (GB) (LB) organization, M / A island decreases, precipitates from niobium, titanium carbon, nitride composition. Combined with the microstructure and mechanical properties of rolled steel, the microstructure and mechanical properties of the rolled steel at 300 ~ 350 ℃ can reach the level of X100 grade pipeline steel.