ABSTRACT

To investigate the alleviation technology of internal cracks, center shrinkage cavities and center segregation of as-cast bloom simultaneously, a three-dimensional finite element model was developed to calculate and analyze the strain fields and deformation behavior of as-cast bloom induced by soft reduction process. In the present work, a multi-stage mechanical soft reduction (MSR) has been developed to simultaneously alleviate center segregation and shrinkage cavities without internal cracks, which aims to provide theoretical basis for improving the internal quality of high carbon as-cast blooms induced by soft reduction technologies. According to the experimental results, the internal cracks were effectively alleviated and center shrinkage cavities were nearly eliminated by optimum designed experiments, the homogeneity and compactness of as-cast bloom can been remarkably improved in comparison with that induced by the conventional soft reduction process. The carbide size and bandwidth of the carbides in the hot-rolled wire were both decreased.

摘要

为同时研究铸态大方坯内部裂纹、中心缩孔和中心偏析的缓解技术，建立三维有限元模型，对软压下引起的铸态大方坯应变场和变形行为进行计算和分析。过程。在目前的工作中，已经开发出一种多级机械轻压下 (MSR) 以同时缓解中心偏析和缩孔而没有内部裂纹，旨在为改善由以下原因引起的高碳铸态大方坯的内部质量提供理论依据。软还原技术。根据实验结果，通过优化设计实验，有效缓解了内部裂纹，基本消除了中心缩孔，与传统的轻压下工艺相比，铸态大方坯的均匀性和致密性得到显着改善。热轧线材中碳化物的碳化物尺寸和带宽均减小。