钢中稀土铈与低熔点金属砷的相互作用研究-材料科学与工程专业论文.docxVIP

贵州大学硕士学位论文 目 录 Ⅱ  HYPERLINK \l _bookmark0 3.3.4 相组成成分分析结果对比44  HYPERLINK \l _bookmark1 3.4 本章小结45  HYPERLINK \l _bookmark2 第四章 结论47  HYPERLINK \l _bookmark3 致 谢48  HYPERLINK \l _bookmark4 参考文献49  HYPERLINK \l _bookmark5 附 录52  HYPERLINK \l _bookmark6 原 创 性 声 明53 贵州大学硕士学位论文 中文摘要 Ⅲ 钢中稀土铈与低熔点金属砷的相互作用研究 摘 要 钢铁产品里的砷主要来自于铁矿石跟废钢。高炉冶炼过程中，铁矿石里的砷被还原，大部分 将进入铁水。因为杂质砷的氧化位比铁的低而不易脱除，所以炼钢过程中绝大部分的砷残留在钢 液中。这些砷最终被带到轧制成材的钢中，使钢材的表面出现了热脆网状裂纹，对一次回火脆跟 二次回火脆的敏感性增强，还使钢材对氢气应力腐蚀的敏感性增大。所以为了保证钢材质量应当 限制钢中砷的含量。 稀土在晶界的富集，可抑制或降低有害杂质如砷、硫、铅、磷等在晶界的偏聚，净化及强化 晶界，从而改善钢的高温塑性、回火脆性跟晶界强度。基于稀土元素在钢中之重要作用，本工作 根据稀土金属铈能跟低熔点杂质砷生成铈砷化合物的热力学性质，通过高温熔渗实验对钢中稀土 铈跟砷的相互作用进行了研究。熔渗实验选用低氧低硫的 H08 钢作为母料，将块状稀土铈及颗粒 状砷按一定比例装入自制熔渗 H08 缸体装置，在通保护气体的条件下于电阻炉中进行熔渗。 实验结果表明：在熔渗过程中，铈原子可沿 H08 钢的奥氏体晶界向内扩散；铈原子可与 H08 钢作用生成铈铁金属间化合物 CeFe2 或 Ce2Fe17；高温熔渗实验主要生成 CeAs 和 Ce4As3 两种铈 砷化合物。 关键词：铈；砷；CeAs；Ce4As3；CeFe2 ；Ce2Fe17 贵州大学硕士学位论文 英文摘要 Ⅳ Study on interaction between RE Cerium and low melting point metal Arsenic in Steel Abstract Arsenic in iron and steel products are mainly from iron ore and scrap. In the process of smelting in Blast furnace, arsenic are reduced , and most of them will enter to liquid iron. In the steel-making process, arsenic are difficult to removal because its oxidation potential is lower than iron, So Most of the arsenic are retained in molten steel. The arsenic are eventually taken to the rolled steel, then the hot shortness crack is appeared in the surface of the steel. This not only makes the steel sensitive to temper brittleness, but aslo increased the sensitivity of stress corrosion of hydrogen of steel. Therefore, we should limited the content of arsenic in steel to improve the quality of steel. The enrichment of Rare-earth in the grain boundary can inhibit harmful impurities such as arsenic, sulfur, lead and phosphorus segregating in the grain boundary, can purify and strengthen gain boundary. It can also improve the high temperature plasticity of steel, tempering brittleness and the