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Toughness dependence of nano-bainite on phase fraction and morphology

机译:纳米贝氏体的韧性对相分数和形貌的依赖性

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摘要

Yield strength of nano-bainitic steels is enhanced while retaining significant ductility with a refinement in the bainitic lath thickness and increasing its volume fraction. This study makes an effort to improve toughness of nano-bainite by investigating the effect of content, size and morphology of constituent phases when austempered at 250 °C, 300 °C and 350 °C. Improved impact and fracture toughness at higher austempering temperature has been observed primarily due to higher content of ductile phase austenite in spite of its coarser morphology. Micrographs of the fracture surface show quasi-cleavage fracture for all the conditions.
机译:纳米贝氏体钢的屈服强度得到了提高,同时通过贝氏体板条厚度的细化和增加其体积分数而保持了显着的延展性。本研究通过研究在250°C,300°C和350°C下回火时组成相的含量,尺寸和形态的影响,努力提高纳米贝氏体的韧性。观察到在较高的回火温度下冲击和断裂韧性得到改善,这主要归因于尽管其形态较粗糙,但韧性相奥氏体的含量较高。断裂表面的显微照片显示在所有条件下的准裂解断裂。

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