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Microstructural Refinement of Bainite and Martensite for Enhanced Strength and Toughness in High-Carbon Low-Alloy Steel

机译:贝氏体和马氏体的显微组织细化以增强高碳低合金钢的强度和韧性

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摘要

This study attempts to determine the scope and extent of microstructural refinement through complete/partial recrystallization of prior cold deformed ferrite during austenitizing (1223 K (950 ℃), 15 minutes) and/or austempering (543 K (270 ℃), 30 minutes) followed by water quenching to obtain ultrafine bainitic sheaves along with thin martensitic plates in SAE 52100 steel. The volume fraction and sheaf/plate dimension (thickness/length) of bainitic ferrite and martensite were determined by optical and scanning/transmission electron microscopy studies coupled with compositional microanalysis. Marginal improvement in the tensile strength and significant improvement in the impact properties is obtained at an optimum level of prior cold deformation by tension in comparison to that recorded in austempered condition without prior deformation.
机译:本研究试图通过在奥氏体化(1223 K(950℃),15分钟)和/或奥氏体回火(543 K(270℃),30分钟)过程中先前的冷变形铁素体的完全/部分再结晶来确定组织细化的范围和程度。然后用水淬火,以在SAE 52100钢中获得超细贝氏体滑轮以及薄马氏体板。贝氏体铁素体和马氏体的体积分数和捆/板尺寸(厚度/长度)通过光学和扫描/透射电子显微镜研究以及成分显微分析确定。与在没有预先变形的奥氏体状态下所记录的相比,在通过张力进行的先前冷变形的最佳水平下,可获得抗拉强度的极限改善和冲击性能的显着改善。

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