低、中碳合金钢液相感应渗氮、碳及共渗研究

发布时间：2018-07-03 17:34

  本文选题：38CrMoAl + 45Mn2　； 参考：《南京理工大学》2015年硕士论文

【摘要】：本文研究了低、中碳合金钢液相感应渗氮、渗碳、氮碳共渗和碳氮共渗技术,液相感应渗入技术是基于感应加热技术对零件进行化学热处理的工艺方法,具有加工时间段短、自动化程度高、节能高效、环境污染小等特点,适于处理各种轴类、套管类等各种适于感应加热的零件。分别研究了38CrMoAl液相感应渗氮和氮碳共渗工艺,45Mn2碳氮共渗工艺,20CrMnTi液相感应渗氮、氮碳共渗和碳氮共渗工艺,渗剂采用甲酰胺溶液；还研究了20CrMnTi液相感应渗碳工艺,渗剂采用等温淬火油。采用金相法、显微硬度法和XRD分析渗层的显微组织、硬度和相组成,研究渗层组织与处理时间和处理温度的关系,确定最佳工艺参数。研究结果表明：38CrMoAl在500℃～650℃进行液相感应渗氮和氮碳共渗,550℃～620℃均得到了不同厚度的白亮层组织,渗层硬度较高,在600℃C下处理10min得到了厚度约100μm的共渗层,硬度约800HV0.1。对38CrMoAl渗层进行XRD分析,渗层主要的相有：ζ相(Fe2N)、ε相(Fe2,3N)、γ□相(Fe4N)、α相、Fe3C。对45Mn2试样在900℃处理5min得到的碳氮共渗层厚度达到330μm,渗层最高硬度达到700HV0.3以上。20CrMnTi在530℃-680℃处理5min均得到了双白层组织,530℃-590℃处理5min得到的双白层的硬度较低,约300℃-450HV0.1；6000C-680℃处理5min得到的共渗层硬度较高,最高约550HV0.1以上；对20CrMnTi试样在700℃-760℃和830℃-880℃进行了液相感应碳氮共渗处理,处理5min渗层厚度达到100μm以上,渗层硬度最高为650HV0.3。20CrMnTi经液相感应渗碳处理后,880℃处理10min的渗碳层厚约150μm,930℃处理10min渗碳层厚约250μm,硬度达到800HV0.3以上,且渗层组织均匀,为针状马氏体组织。
[Abstract]:In this paper, the liquid phase induction nitriding, Carburizing, nitrocarburizing and carbonitriding technology of low and medium carbon alloy steels are studied. The liquid phase induction infiltration technology is a chemical heat treatment process for parts based on induction heating technology, which has a short processing time. High degree of automation, energy saving and high efficiency, low environmental pollution, etc., suitable for handling all kinds of shaft, casing and other parts suitable for induction heating. The liquid phase induction nitriding, nitrocarburizing and carbonitriding process of 20CrMnTi were studied respectively, and the liquid phase induction nitriding, nitrocarburizing and carburizing process of 20CrMnTi with formamide solution were studied, and the liquid phase induction carburizing process of 20CrMnTi was also studied. The osmotic agent is isothermal quenching oil. The microstructure, hardness and phase composition of the infiltrating layer were analyzed by metallography, microhardness and XRD. The relationship between the microstructure of the layer and the treatment time and temperature was studied, and the optimum technological parameters were determined. The results showed that different thickness of white bright layer was obtained by liquid phase induction nitriding and nitrocarburizing at 500 鈩，

本文编号：2094467