本文選題：60Si2Mn + 旋耕刀�。� 參考：《鄭州航空工業(yè)管理學院》2017年碩士論文

【摘要】：旋耕刀作為旋耕機農耕工作時的關鍵件,由于摩擦磨損頻繁失效,達不到土壤耕作質量要求,使用過程中又由于旋耕刀的更換,費事費力,增加了作業(yè)成本,嚴重時耽誤了最佳農時,通過提高旋耕刀耐磨性能進而提高其使用壽命具有重大的經濟意義。旋耕刀的磨損失效形式主要有磨粒磨損和沖蝕磨損,本文的研究不僅關注傳統(tǒng)意義上的磨粒磨損,更加關注其在一定沖擊載荷和土壤等腐蝕介質下抵抗應力集中敏感性的沖蝕磨損,著重提高旋耕刀的抗沖蝕磨損性能。采用C-N共滲、深層Re-B-C-N共滲、復合共滲三種表面改性工藝,對旋耕刀用基體鋼60Si2Mn進行了表面強化,考慮到旋耕刀要兼顧整體抵抗沖擊的實際,表面改性層形成后要進行強韌化熱處理。通過進行金相組織、顯微硬度、磨粒磨損實驗、沖蝕磨損實驗、硝酸溶液腐蝕試驗、土壤腐蝕試驗,研究了不同共滲工藝下滲層的組織性能特征。取得的主要研究結論如下:(1)對比C-N共滲工藝不同回火溫度下滲層和心部顯微硬度發(fā)現,200℃回火溫度下滲層較心部硬度提高最大,約3HRC,并與未進行C-N共滲的試樣一起進行了環(huán)塊磨損對比實驗,結果表明,第5小時末測量的質量損失分別為179.8mg、300.3mg,耐磨性提高一倍以上。(2)深層Re-B-C-N共滲、復合共滲兩種工藝的抗磨粒磨損、抗沖蝕磨損和土壤中耐蝕性能均優(yōu)于C-N共滲工藝。(3)最后通過生產應用試驗,對比分析了不同共滲強化工藝下旋耕刀在生產作業(yè)土壤中的耐磨性能,結果表明深層Re-B-C-N共滲、復合共滲工藝在800畝耕地推廣示范中展示了高性能、高指標。
[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，

本文編號：1733423