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利用扫描电镜(SEM)、透射电镜(TEM)对炉卷轧机生产X100管线钢的显微组织特点进行了观察与分析,通过背散射电子衍射技术(EBSD)探讨了X100管线钢的有效晶粒尺寸与低温韧性的关系,并利用物理化学相分析的方法对X100管线钢的析出粒子尺寸分布和强化作用进行了定量分析.结果表明:X100管线钢的显微组织以粒状贝氏体为主,晶粒内部和晶界上弥散分布着大量细小的马氏体/奥氏体(M/A)岛;X100管线钢的有效晶粒尺寸较小,仅为2μm左右,细化有效晶粒尺寸和降低组织方向性有利于提高管线钢的低温韧性;X100管线钢中的析出粒子尺寸较小,平均尺寸为45.4nm,但由于其总体质量分数只有0.062%,经计算,其析出强化作用约为52MPa,析出强化对屈服强度贡献较小.
The microstructure of X100 pipeline steel produced by the furnace was observed and analyzed by scanning electron microscope (SEM) and transmission electron microscope (TEM). The effective grain size of X100 pipeline steel was analyzed by backscattered electron diffraction (EBSD) And the relationship between low temperature toughness and the physical and chemical analysis of the X100 pipeline steel precipitation particle size distribution and strengthening effect were quantitatively analyzed.The results show that: X100 pipeline steel microstructure mainly granular bainite, crystal A large number of fine martensite / austenite (M / A) islands are scattered on the grain boundaries and grain boundaries. The effective grain size of X100 pipeline steel is only about 2μm, and the effective grain size is refined and reduced The orientation of the structure is conducive to improve the low temperature toughness of pipeline steel; X100 pipeline steel precipitated particles smaller size, the average size of 45.4nm, but because of its overall mass fraction of only 0.062%, calculated by precipitation strengthening the role of about 52MPa, Precipitation hardening contribute less to yield strength.