目 录1 绪论..............................................................11.1 断口分析的意义...............................................11.2 对显微组织及断口缺陷的理论分析..............................11.3 讨论方法和实验设计...........................................31.4 预期结果和意义...............................................32 实验过程..........................................................32.1 生产工艺....................................................42．1.1 加料..................................................42.1.2 精炼...................................................42.1．3 保温、扒渣和放料......................................42.1. 4 单线除气和单线过滤....................................52.1. 5 连铸..................................................62.2 实验过程....................................................62.2. 1 试样的选取............................................62.2.2 金相试样的制取.........................................82.2.3 用显微镜观察...........................................92.3 观察方法...................................................102.3.1 显微组织的观察........................................102.3.2 对断口形貌的观察......................................113 实验结果及分析...................................................113.1 对所取 K 模试样的观察........................................113.2 金相试样的观察及分析.......................................123.2.1 对显微组织的观察......................................123.2.2 断口缺陷..............................................15结论...............................................................23致谢...............................................................24参考文献...........................................................25附录...............................................................271 绪论1.1 断口分析的意义随着现代科技的进展以及现代工业的需求，作为 21 世纪三大支柱产业的材料科学正朝着高比强度，高强高韧等综合性能等方向进展...
