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首页> 外文会议>International Conference on Processing Manufacturing of Advanced Materials >Analysis of Hot Tensile and Compression Curves to Assess the Hot Ductility of C-Mn Steels
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Analysis of Hot Tensile and Compression Curves to Assess the Hot Ductility of C-Mn Steels

机译：热拉伸和压缩曲线分析评估C-MN钢的热延展性

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The unbending operation is a critical stage of steel continuous casting because it is carried out at thermomechanical conditions for which embrittlement mechanisms can appear leading to transverse cracking. The hot tensile test is commonly used to simulate such thermomechanical conditions, at the surface of the slab, and, the reduction in area of the samples tested to fracture is taken as a measure of the susceptibility to cracking of the steel. However, a further metallographic and fractographic evaluation of the samples is required in order to identify the embrittlement mechanisms. These mechanisms are usually related to transformations in the microstructure, such as precipitation or the appearance of deformation induced ferrite, which imply changes in the strength of the material and should therefore be detectable in the flow curves. However, the features of tensile curves are not usually analyzed when evaluating the hot ductility because necking makes the interpretation of the curves complicated. In this work the hot ductility of a C-Mn steel will be discussed by means of hot tensile and compression tests. The embrittlement mechanism identified for this steel is the appearance of a ferrite layer at austenite grain boundaries. The effect of this mechanism on the features of the tensile curves will be discussed. Moreover, these curves will be compared to compression curves obtained under the same testing conditions to see whether transformation induced ferrite can be detected by means of hot compression testing. The possibility of assessing the ductile behavior of different steel grades through hot compression, which requires less material and is easier to control, will be discussed.
机译：不平衡的操作是钢连续铸造的关键阶段，因为它在热机械条件下进行，其中脆化机制可以出现导致横向开裂。热拉伸试验通常用于模拟板坯表面的这种热机械条件，并且通过测试到骨折的样品的面积的减少作为对钢开裂的敏感性的衡量标准。然而，需要进一步的金相和样品的分接评估，以识别脆化机制。这些机制通常与微观结构的变换相关，例如沉淀或变形诱导的铁氧体的外观，这意味着材料的强度变化，因此应在流动曲线中可检测。然而，在评估热延展性时通常不会分析拉伸曲线的特征，因为缩颈使得曲线复杂的解释。在这项工作中，将通过热拉伸和压缩测试讨论C-Mn钢的热延展性。为该钢鉴定的脆化机构是奥氏体晶界的铁氧体层的外观。将讨论该机制对拉伸曲线特征的影响。此外，这些曲线将与在相同的测试条件下获得的压缩曲线进行比较，以查看是否可以通过热压缩测试检测转化诱导的铁氧体。将讨论通过热压缩评估不同钢等级的延性行为的可能性，这需要更少的材料并且更容易控制。

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