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采用光学显微镜、扫描电镜、透射电镜并利用背散射电子衍射(EBSD)的方法对低碳NiCrMoV钢经不同冷却方式获得的马氏体/贝氏体组织、亚结构进行了定量分析,研究其对强韧性的影响。结果表明:10CrNi5MoV钢原始奥氏体晶粒内的组织经不同比例马氏体、贝氏体混合后,强度变化不大,而韧性随板条束和板条块尺寸的减小而提高,此时单个板条的宽度在0.38μm左右。进一步研究表明,板条束界和板条块界对裂纹扩展具有相同的阻碍作用,且板条块宽度对冲击韧性的影响作用远远大于板条束。因此,本研究中的板条块可作为低碳马氏体钢对韧性起作用的组织控制亚单元,即板条块尺寸为控制韧性的“有效晶粒尺寸”。
The microstructure and substructure of martensite / bainite obtained from different cooling methods of low carbon NiCrMoV steel were studied quantitatively by means of optical microscope, scanning electron microscope, transmission electron microscope and backscattered electron diffraction (EBSD) Toughness of the impact. The results show that the strength of the original austenite grains in 10CrNi5MoV steel after mixed with different proportions of martensite and bainite does not change much, while the toughness increases with the decrease of the size of the slab and slab. When the width of a single slab is about 0.38μm. Further studies have shown that the slab boundaries and the slab boundaries have the same obstruction to the crack propagation, and the influence of the slab width on the impact toughness is far greater than that of the slat beams. Therefore, the slab in this study can be used as a tissue control subunit for the toughness of low-carbon martensitic steels, that is, the “effective grain size” of slab size is controlled toughness.