（毕业设计论文）《20CrMnTi碳氮共渗组织性能分析与研究》.doc

北华航天工业学院毕业论文 4 - 摘 要 碳氮共渗是碳氮原子同时渗入工件表面的一种化学热处理工艺，采用此技术可以很好的改善金属的表面性能。本论文提出采用无毒低氰渗剂，通过在熔融状态下渗剂之间的反应，对20CrMnTi钢进行液体碳氮共渗，寻找合理的工艺配方，并对所获得的金属表层组织和性能进行分析和研究。 本文针对不同加热温度不同保温时间的金属表层组织和显微硬度进行了分析和研究，分析实验结果得知：液体碳氮共渗技术中由于有氮的渗入，所以降低了钢的临界点，增加了共渗层过冷奥氏体的稳定性。使淬透性差的工件制成的零件也能得到很好的淬透性。液体碳氮共渗在易操作的同时，使金属表层的硬度和耐磨性等方面均有显著的提高。 关键词： 合金渗碳钢 低氰盐 无毒 液体碳氮共渗 Abstract Carbonitriding is a chemical heat treatment that the carbon and nitrogen atoms go into the surface together.Using of this technology can improve the surface properties of metals well. This paper presents using the low cyanide and non-toxic penetration, through the reaction between the penetration in the molten state,to do the liquid carbonitriding to the 20CrMnTi, to find a reasonable process of formula,and direct the microstructure and properties of metal’s face to analysis and research. This passage analysises and does research about metal surface and microhardness in different heating temperature and different holding time. Analysis of experimental results: liquid carbonitriding technology due to the infiltration of nitrogen, so reducing the critical point of steel, increased the permeation layer of the stability of supercooled austenite.Make the artifacts of poor hardenability can get good hardenability.Liquid carbonitriding is easy to operate,at the same time,it can make the metal surface hardness and wear resistance, etc. have improved significantly. Key words: alloy carburizing steel low cyanide salt non-toxic liquid carbonitriding 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc295811495 摘要 PAGEREF _Toc295811495 \h I HYPERLINK \l _Toc295811496 Abstract PAGEREF _Toc295811496 \h II HYPERLINK \l _Toc295811497 第1章 绪论 PAGEREF _Toc295811497 \h 1 HYPERLINK \l _Toc295811498 1.1 立项背景 PAGEREF _Toc295811498 \h 1 HYPERLINK \l _Toc295811499 1.2 液体碳氮共渗 PAGEREF _Toc295811499 \h 1 HYPERLINK \l _Toc295811500 1.2.1液体碳氮共渗的研究历程 PAGEREF _Toc295811500 \h 1 HYPERLINK \l _Toc295811501 1.2.2 液体碳氮共渗的特点 PAGEREF _Toc295811501 \h