9310钢窄齿形零件渗碳工艺的研究
发布时间：2018-03-17 01:17
本文选题：9310钢 切入点：渗碳 出处：《哈尔滨理工大学》2017年硕士论文 论文类型：学位论文
【摘要】：本文利用可控气氛双室炉对9310钢试样在不同渗碳温度下进行渗碳实验,研究9310钢材料渗层、剥层碳浓度、残余奥氏体含量等变化规律,通过分析渗碳后的金相组织,渗碳温度和渗碳时间对深层深度的影响,碳势对剥层碳浓度的影响以及残余奥氏体含量与冰冷处理的关系,最终确定了9310渗碳钢热处理渗碳淬火的最佳工艺参数,从而为实际生产提供理论指导。本实验所用的9310钢在其他工艺参数不变的情况下,经过900℃、910℃、927℃三个温度渗碳保温后,可以从金相组织图中看到随着温度的升高,其渗碳层的组织变化也越来越显著,且HRC60深度及硬度随着温度的升高而增加,渗层深度随着渗碳温度的提高不断加深,不同的渗碳温度下的残余奥氏体量均小于10%,长时间(至少4小时)的深冷处理才可以使残余奥氏体的含量达到标准(小于10%),温度对其影响并不是很明显。随着渗碳温度的升高,渗碳层中碳浓度升高,含碳量明显增加。当采用不同渗碳温度进行渗碳,在0.2 mm剥层碳浓度梯度最高,0.2 mm处反应为真实的碳浓度梯度,即波层碳浓度较高。本文还研究了9310钢的齿形参数对渗层深度的影响,研究结果表明:在900℃、910℃、927℃三个温度渗碳保温后,9310钢心部组织不受渗碳温度的影响,齿顶渗层都存在超差现象,齿顶渗层深度与齿高中部的渗层深度存在对应关系,最后得出齿宽m与过渗相关距离H存在三种对应关系:(1)当m=2H·ctgθ时,齿顶刚好达到过渗点;(2)当m㧐2H·ctg(?)时,齿顶不存在过渗现象;(3)当m＜2H·ctgθ时,齿顶发生过渗现象。
[Abstract]:In this paper, the Carburizing experiments of 9310 steel samples at different Carburizing temperatures were carried out by means of a controlled atmosphere double chamber furnace. The changes of the layer, the carbon concentration and the residual austenite content of the 9310 steel material were studied. The microstructure of the steel after Carburizing was analyzed. The effects of Carburizing temperature, Carburizing time on the deep depth, the effect of carbon potential on the denudation carbon concentration, and the relationship between the residual austenite content and the cold treatment, the optimum technological parameters for heat treatment and quenching of 9310 Carburized steel were determined. So as to provide theoretical guidance for practical production. The 9310 steel used in this experiment has been carburized at 900 鈩，
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