采用ANSYS有限元模拟、彩色金相技术并利用背散射电子衍射（EBSD）的方法分析板条M/B混合组织对10CrNi5Mo低碳马氏体钢强韧性的影响。结果表明,特厚板厚度方向各部位冶金质量差别很小。淬火冷却条件下,钢板表面获得单一马氏体组织,1/4部位和心部得到板条M/B混合组织。板条M/B混合组织较单一马氏体组织具有更小的亚结构和更长的大角晶界是造成心部获得优良低温韧性的原因。板条M/B混合组织能显著提高10CrNi5Mo钢的低温韧性,降低韧脆转变温度,但对强度影响不明显。
Effect of lath martensite/bainite mixed structure on strength and toughness of 10CrNi5Mo low carbon martensite steel ultra-heavy plate was investigated by means of electron backscatter diffraction（EBSD） and finite element analysis.The results indicate that no significant variation of metallurgical quality is observed in thick-direction of the ultra-heavy plate,Single martensite microstructure is obtained in the steel plat surface,while lath martensite/bainite mixed structure appears in 1/4 thickness position and center of the ultra-heavy plate of 120 mm thick after quenching.Compared to single martensite structure,lath martensite/bainite mixed structure with finer substructure presents longer high-angle boundaries.thus lath martensite/bainite mixed structure in the center can induce excellent low temperature toughness.Generally,lath martensite/bainite mixed structure improves low temperature toughness of the 10CrNi5Mo steel plate and lowers its ductile-brittle transition temperature,however,it has no significant influence on strength.
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