60Si2Mn旋耕刀共渗强化技术研究

发布时间：2018-04-10 23:27

  本文选题：60Si2Mn + 旋耕刀　； 参考：《郑州航空工业管理学院》2017年硕士论文

【摘要】：旋耕刀作为旋耕机农耕工作时的关键件,由于摩擦磨损频繁失效,达不到土壤耕作质量要求,使用过程中又由于旋耕刀的更换,费事费力,增加了作业成本,严重时耽误了最佳农时,通过提高旋耕刀耐磨性能进而提高其使用寿命具有重大的经济意义。旋耕刀的磨损失效形式主要有磨粒磨损和冲蚀磨损,本文的研究不仅关注传统意义上的磨粒磨损,更加关注其在一定冲击载荷和土壤等腐蚀介质下抵抗应力集中敏感性的冲蚀磨损,着重提高旋耕刀的抗冲蚀磨损性能。采用C-N共渗、深层Re-B-C-N共渗、复合共渗三种表面改性工艺,对旋耕刀用基体钢60Si2Mn进行了表面强化,考虑到旋耕刀要兼顾整体抵抗冲击的实际,表面改性层形成后要进行强韧化热处理。通过进行金相组织、显微硬度、磨粒磨损实验、冲蚀磨损实验、硝酸溶液腐蚀试验、土壤腐蚀试验,研究了不同共渗工艺下渗层的组织性能特征。取得的主要研究结论如下:(1)对比C-N共渗工艺不同回火温度下渗层和心部显微硬度发现,200℃回火温度下渗层较心部硬度提高最大,约3HRC,并与未进行C-N共渗的试样一起进行了环块磨损对比实验,结果表明,第5小时末测量的质量损失分别为179.8mg、300.3mg,耐磨性提高一倍以上。(2)深层Re-B-C-N共渗、复合共渗两种工艺的抗磨粒磨损、抗冲蚀磨损和土壤中耐蚀性能均优于C-N共渗工艺。(3)最后通过生产应用试验,对比分析了不同共渗强化工艺下旋耕刀在生产作业土壤中的耐磨性能,结果表明深层Re-B-C-N共渗、复合共渗工艺在800亩耕地推广示范中展示了高性能、高指标。
[Abstract]:The rotary tillage knife is the key part in the rotary tiller's farming work. Because of the frequent failure of friction and wear, it can not meet the requirements of soil tillage quality. In the process of use, the replacement of rotary tillage knife takes a lot of trouble and increases the cost of operation.It is of great economic significance to improve the wear resistance of rotary tillage knife and improve its service life when the best agriculture is delayed.The wear failure forms of rotary tillage knife are mainly abrasive wear and erosion wear.More attention is paid to the erosion wear resistance to stress concentration sensitivity in a certain impact load and soil etched medium, especially to improve the erosion wear resistance of rotary tillage knife.Three surface modification processes, C-N co-infiltration, deep Re-B-C-N co-infiltration and composite co-infiltration, were used to strengthen the surface of the matrix steel 60Si2Mn used in rotary tillage knife, considering the fact that the rotary tillage knife should take into account the whole resistance to impact.The surface modified layer should be strengthened and toughened by heat treatment after forming.The microstructure and properties of the infiltrated layer were studied by means of metallographic microstructure, microhardness, abrasive wear test, erosion test, nitric acid solution corrosion test and soil corrosion test.The main results obtained are as follows: compared with C-N co-infiltration process, the microhardness of the percolation layer and core at different tempering temperatures is higher than that of the core at 200 鈩，

本文编号：1733423