BS950高强钢原始组织和性能研究+文献综述.docVIP

BS950高强钢原始组织和性能研究+文献综述 摘要：本论文研究了1500mm宽6mm板厚两个批次BS950钢的边部和心部的原始组织及其硬度，利用X射线衍射精确测定了BS950高强钢边部心部的微结构和马氏体的晶格常数，进行了BS950高强钢板边部和心部的原始组织的扫描电镜观察；测定了升温过程中BS950钢的热膨胀特性和内耗曲线。研究结果表明：BS950钢边部和心部的显微组织是板条状马氏体；硬度实验结果表明钢的平均硬度是42HRC，但是边部比心部的硬度值高，XRD分析发现其点阵常数边部小于心部，半高宽也存在差异，通过对内耗峰的峰高和峰位置进行比对，发现边部的碳析出程度高，通过热膨胀曲线发现钢板边部的热膨胀系数高于心部。这表明BS950钢边部心部存在微观组织上的不均匀性，导致了钢板性能的不均匀。这可能与钢板热轧快冷的冷却方式有关，从而为寻找BS950高强钢起翘的原因提供理论依据。关键词：高强钢；显微组织；内耗峰；热膨胀9120 Original Microstructure and Properties of BS950 High-Strength Steel Abstruct: The 1500 mm width 6 mm thickness two batches BS950 steel edge and center of the original organization and its hardness were studied in this paper，Accurately determined by X-ray diffraction strength of the BS950 steel edge portion and the central portion of the martensite microstructure lattice constant. The BS950 high-strength steel plate edge and center of the original scanning electron microscopy (sem) observation of the organization. The temperature BS950 steel thermal expansion characteristics and internal friction in the process of the curve were measured. The research results show that the BS950 steel edge and center of the strip martensite microstructure is board and the average hardness of the steel hardness is 42 HRC, but high hardness value than that of the center by batch annealing of edge.XRD analysis found that the lattice constant is less than the core of edge, and a half high width is different. Through to the internal friction peak height and peak position compare, found that carbon precipitation of edge degree is high. Through thermal expansion coefficient of thermal expansion curve found that steel plate edge is higher than the heart. Suggesting BS950 steel edge micro organizational core existence irregularity, led to the uneven steel performance. This may be associated with the cooling system of steel plate hot rolling fast, thus to find the cause of the high strength steel case become warped BS950 provides theory basis. 2.7 彩色金相试验12 2.8 热膨胀试验12 3.实验结果及