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首页> 外文会议>TMS annual meeting exhibition;Symposium on characterization of minerals, metals, and materials >MICROSTRUCTURAL INVESTIGATION OF CARBON STEEL AFTER HOT ROLLING TO OPTIMIZE COMPLEX HOT FORMING OF THICK PLATES
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MICROSTRUCTURAL INVESTIGATION OF CARBON STEEL AFTER HOT ROLLING TO OPTIMIZE COMPLEX HOT FORMING OF THICK PLATES

机译：热轧后碳钢的微观结构研究，以优化厚板的复杂热成形

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In this study, an investigation on the microstructure of hot rolled steel S355J2+N was conducted to optimize process parameters of complex forming, which combines rolling and bending. The best sets of parameters are worked out based on homogeneous mechanical properties and microstructure within the varied deformation degree with maximum at Φ = 1.14 on a 25 mm thick plates. Mechanical properties, especially of heavy plates, are strongly influenced by the local deformation degree, strain rate and temperature. Detailed microstructural analyses showed that the ferrite-pearlite band structure changes near the surface, while maintaining homogeneous microstructure within the deformed work piece. Surface decarburization was also observed and this leads to decrease in hardness. To minimize iron oxide formation which could lead to side cracking, reduction in exposure time to temperature was suggested. On the other hand, temperature reduction below a critical value would risk the accurate forming process.
机译：在这项研究中，对热轧钢S355J2 + N的显微组织进行了研究，以优化结合了轧制和弯曲的复杂成形工艺参数。在变化的变形程度内，基于均质的力学性能和微观结构，在Φ= 1.14的最大值上，在25毫米厚的板上，可以得出最佳的参数集。机械性能，特别是厚板的机械性能，受局部变形程度，应变速率和温度的强烈影响。详细的微观结构分析表明，铁素体-珠光体的能带结构在表面附近发生了变化，同时在变形的工件内保持了均匀的微观结构。还观察到表面脱碳，这导致硬度降低。为了最大程度地减少可能导致侧裂的氧化铁的形成，建议减少暴露于温度的时间。另一方面，将温度降低到临界值以下将有可能导致准确的成型过程。

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