本文選題：磨損 + 高性能��； 參考：《東華大學》2017年碩士論文

【摘要】：據(jù)國際有關部門的初步統(tǒng)計,2%-4%國民生產(chǎn)總值的損失是由于零件表面磨損問題所導致的。在我國,因為零件磨損而導致的機器、設備失效或報廢的問題也是十分嚴峻的。僅就機械、礦山、電力和建材等工業(yè)部門的不完全統(tǒng)計,每年因為零件磨損問題而導致的鋼材損耗約為100萬噸。本課題將針對高接觸應力下的磨損問題,將電刷鍍技術與電接觸強化技術相結合,研究制備了一種高性能厚涂層的工藝。其中,分析列舉了影響鍍層增長與鍍層質量的原因,根據(jù)影響因素,制定了切實可行的研究方案,研究制備了鍍層厚度達到0.5mm左右的鎳基鍍層,并掌握了相應的實驗規(guī)律。然后,對制備的鍍層通過電接觸強化,經(jīng)分析可知,強化后兩種鍍層的硬度、鍍層與基體的結合力、抗熱疲勞性等均得到了較大的提升。通過對電接觸強化后的鍍層進一步分析可知,經(jīng)過電接觸強化后,鍍層表面上的缺陷減少,這是由于電接觸強化過程中,電極輪與工件鍍層的緊密壓合,并由電接觸強化機輸入高達20KA的大電流,導致電極輪產(chǎn)生巨大的電阻熱,工件鍍層產(chǎn)生了熔合與擴散現(xiàn)象,填補了縫隙,通過電極輪與工件的相對轉對,壓合了凹陷,修復了部分缺陷;在冷卻液與瞬間高溫的作用下,對靠近結合處的基體起到了淬火效果,改變了靠近結合處基體的組織形貌,提升了硬度。通過掃描電鏡觀察,強化后鍍層與基體組織形貌發(fā)生了改變,結合處產(chǎn)生了擴散、融合等現(xiàn)象。通過XRD分析可知,電接觸強化細化了晶粒,產(chǎn)生了再結晶效果。
[Abstract]:According to the preliminary statistics of relevant international departments, the loss of gross national product (GNP) of 2% to 4% is caused by the wear problem on the surface of parts.In our country, the problem of machine, equipment invalidation or scrapping caused by wear and tear of parts is also very serious.Incomplete statistics for the mechanical, mining, electric and building industries alone account for about 1 million tons of steel per year due to wear and tear.In order to solve the wear problem under high contact stress, a kind of thick coating with high performance was prepared by combining brush plating technology with electrical contact strengthening technology.Among them, the reasons that affect the growth and quality of the coating are analyzed and listed. According to the influencing factors, the feasible research scheme is established, and the nickel base coating whose thickness is about 0.5mm is researched and prepared, and the corresponding experimental law is grasped.The hardness of the two coatings, the adhesion between the coating and the substrate, and the thermal fatigue resistance of the two coatings were greatly improved.Through the further analysis of the electrocontact strengthened coating, it can be seen that the defects on the surface of the coating are reduced after the electric contact hardening, which is due to the close pressing of the electrode wheel and the coating of the workpiece during the electric contact strengthening process.The high current of up to 20KA is input from the electric contact intensifier, which leads to the great resistance heat of the electrode wheel, the phenomenon of fusion and diffusion of the coating of the workpiece, filling the gap, and pressing the depression through the relative rotation between the electrode wheel and the workpiece.Under the action of the coolant and the instantaneous high temperature, the matrix near the bond was quenched, the microstructure of the matrix near the bond was changed, and the hardness was increased.Scanning electron microscopy (SEM) showed that the morphology of the coating and the matrix changed, and diffusion and fusion occurred at the bonding point.XRD analysis shows that the grain is refined by electric contact strengthening and recrystallization effect is obtained.
【學位授予單位】：東華大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG174.44

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