Abstract

An ultrafine-grained (UFG) structure of equiaxed and fiber types in the low-carbon structural steel 05G2MFBT (Fe–2Mn–Mo–V–Nb–Ti) has been formed with various techniques of deformation-heat treatment. This steel with a UFG structure has been found to exhibit higher strength properties. Different deformation techniques have been shown to produce either a fibrous or an equiaxed UFG structure with carbide particles of a wide range of sizes. The brittle fracture resistance of the fibrous UFG steel has been found to be higher than that of the fine-grained steel after controlled rolling and subsequent accelerated cooling. Standard bending-impact tests have shown that the steel with a fibrous UFG structure is characterized by higher impact strength characteristics and a lower ductile–brittle transition temperature.

中文翻译：

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变形-热加工对低碳结构钢组织和力学性能的影响

摘要

低碳结构钢 05G2MFBT（Fe-2Mn-Mo-V-Nb-Ti）中的等轴和纤维类型的超细晶 (UFG) 结构已通过各种变形热处理技术形成。已发现这种具有 UFG 结构的钢具有更高的强度特性。不同的变形技术已被证明可以产生具有各种尺寸的碳化物颗粒的纤维状或等轴 UFG 结构。已发现纤维状 UFG 钢在受控轧制和随后的加速冷却后的抗脆性断裂性能高于细晶粒钢。标准弯曲冲击试验表明，具有纤维状 UFG 结构的钢具有较高的冲击强度特性和较低的韧脆转变温度。