q235碳钢实验室固体变形渗碳技术.doc

Q235碳钢实验室固体变形渗碳技术


摘    要
　　　本课题名称为Q235碳钢实验室固体变形渗碳技术，主要是通过实验的手段并结合一些数学方法对Q235碳钢经拉伸变形后的固体渗碳工艺进行深入研究，将材料变形和化学热处理相结合，探索变形低碳钢件固体渗碳工艺的相关技术及低碳钢经变形渗碳后主要性能的变化。通过大量实验并结合数学理论的计算，最终得出了Q235碳钢在不同拉伸变形条件和渗碳时间下的渗碳层深度、硬度及渗碳件冲击韧性的实验数据。
　　　通过实验和计算得出的数据，得到渗碳层深度与渗碳保温时间关系、渗碳层深度与拉伸变形率关系、冲击韧性与保温时间关系，反映了Q235碳钢渗碳件主要性能与渗碳温度和拉伸变形率的关系。
　　　通过在实验中控制拉伸变形率和渗碳温度而得到的一系列关系，定性的分析研究了渗碳温度对渗碳件硬度的影响；渗碳件硬度沿渗碳层的变化情况；渗碳件的冲击韧性等。这些研究得出的结果，更深刻地了解了低碳钢渗碳技术，认识了对渗碳主要工艺参数的控制，并借鉴前人的成果，得到渗碳保温时间越长，渗碳层越深，渗碳件表面硬度越高，故而渗碳效果越好。但另一方面，渗碳温度越高越长，表面脆性增强，韧性降低，即试件抗冲击性能降低。渗碳后缓冷，将得到珠光体类型的组织，由表面向内依次为过共析区（珠光体+网状渗碳体）、共析区（珠光体）、亚共析区（珠光体+铁素体,且铁素体的量由外向内不断增加），直至原始组织。
    Q235碳钢经拉伸变形后的固体渗碳工艺进行深入研究，将材料变形和化学热处理相结合，探索变形低碳钢件固体渗碳工艺的相关技术及低碳钢经变形渗碳后主要性能的变化。   

关键词:  Q235碳钢；固体渗碳；变形渗碳；渗碳温度；渗碳层深度

The solid deformation carburizing process of Q235 carbon steel in laboratory

Abstract
　　The name of the topic deformation of Q235 carbon steel solid carburizing technology laboratory. Mainly by means of experiments and mathematical methods combined with some of tensile deformation on Q235 steel by carburizing process after the solid-depth study of the material deformation and the combination of chemical treatment, to explore low carbon steel deformed carburizing technology related to solid Skilled and low-carbon steel after carburizing by the deformation of the major performance changes. By combining a large number of experiments and mathematical theory of computation, eventually obtained the tensile deformation of Q235 carbon steel in different conditions and under the carburizing carburizing time depth, hardness and impact toughness of carburized pieces of experimental data.
　　Experimental and calculated data, the depth of carburized layer holding time carburizing, carburizing depth relationship with the tensile strain rate, impact toughness and holding time, reflecting the Q235 carbon steel with carburized main performance parts Carburizing temperature and the relationship between the rate of tensile deformation.
　　Controlled by tensile deformation rate of the experiment and obtained a series of carburizing temperature relationship, qualitative analysis of the carburizing temperature on the hardness of carburized parts; carburized carburized layer hardness along parts of the changes; carburizing Parts of the impact toughness.The results of these studies, a deeper understanding of the low carbon carburizing technology, understanding the main process parameters on the control of carburization, and learn from previous studies, the longer the holding time by carburizing, carburizing layer deeper , the higher the surface hardness of carburized parts, and therefore the better cementite. On the other hand, the longer the holding time carburizing, surface brittleness increased, the toughness decreases, that is, the specimen impact performance. Slow cooling after carburizing, will be pearlite type of organization, followed by the inner surface area than eutectoid (pearlite + network cementite), eutectoid zone (pearlite), hypoeutectoid District (pearlite Ferrite and ferrite increasing the amount of outside to inside) until the original organization.
　　Q235 carbon steel after deformation by tension-depth study of the solid carburizing process, the material deformation and the combination of chemical treatment, to explore low carbon steel deformed solid carburizing process related technologies and low carbon steel after carburizing by the deformation of the main performance Changes.

Keywords: Q235 carbon steel; Solid carburizing; Deformation of cementite; Carburizing temperature carburized layer depth
目录

摘    要 I
Abstract II
插图清单 IV
表格清单 V
引 言 - 1 -
第1章   绪 论 - 2 -
1.1 热处理概述 - 2 -
1.2 我国渗碳技术的发展 - 2 -
1.3本课题主要研究内容与选题意义 - 3 -
第2章   低碳钢固体预变形渗碳技术 - 4 -
2.1  渗碳 - 4 -
2.2 钢的形变热处理 - 10 -
2.3 Q235碳钢性能 - 11 -
第3章   实验过程与结果 - 12 -
3.1拉伸变形 - 12 -
3.2 渗碳 - 14 -
3.3 渗碳件的性能测试 - 17 -
第4章   实验结果与分析 - 23 -
4.1 渗碳层深度数据分析 - 23 -
4.2 冲击试验数据分析 - 25 -
4.3 金相图片分析 - 26 -
结论与展望 - 27 -
致  谢 - 28 -
参考文献 - 29 -
附录A 外文文献及翻译 - 30 -
附录B 文献摘要 - 43 -