本文選題：H13鋼 + TC4合金　； 參考：《江蘇大學》2017年碩士論文

【摘要】：磨損是金屬構(gòu)件的主要失效形式之一,對金屬材料的摩擦磨損性能展開研究并提高其耐磨性能具有重要的理論意義和工程應用價值。研究表明,當磨面出現(xiàn)穩(wěn)定存在且以氧化物為主要成分的摩擦層時,磨損率可以得到不同程度的降低。但氧化物需要在高溫或高速條件下才能形成,因此限制了摩擦層在減磨方面的應用。本文采用銷盤式摩擦磨損試驗機,室溫條件下分別在H13/GCr15鋼和TC4/GCr15鋼磨面添加固態(tài)顆粒,促使形成人造摩擦層以減少基體磨損量。分別研究了Fe_2O_3、MoS_2和其不同比例的混合物對兩種合金材料摩擦磨損行為的影響。通過XRD、EDS和SEM等微觀手段對摩擦表面和剖面的物相、成分、形貌和結(jié)構(gòu)進行表征,并探討不同實驗條件下的磨損機理。實驗結(jié)果表明,在磨損表面添加Fe_2O_3、MoS_2或其不同比例的混合物可以形成人造摩擦層,而人造摩擦層的形成對H13鋼和TC4合金磨損率和磨損機制具有顯著的影響。對于H13鋼和TC4合金,在不添加任何顆粒時,磨損機制為典型的磨粒磨損和粘著磨損,磨損率隨載荷的升高快速增加。此時,磨面并未出現(xiàn)氧化物,即未形成覆蓋整個磨面的摩擦層,且H13鋼亞表面出現(xiàn)明顯的塑性變形并伴有明顯孔洞。在磨面添加固態(tài)顆粒時,磨損率得到不同程度的降低,發(fā)生嚴重-輕微磨損轉(zhuǎn)變。當添加Fe_2O_3固態(tài)顆粒時,Fe_2O_3顆粒可以在H13鋼和TC4合金的磨面上快速團聚并燒結(jié),形成覆蓋整個磨面的人造摩擦層,對基體起到顯著的保護作用,但此時摩擦系數(shù)達到最大值。此外,較差的熱傳導性和較高的承載性能可以一定程度的降低由于熱軟化所導致的亞表面塑性變形。當添加MoS_2顆粒時,由于MoS_2與H13鋼之間具有較強的吸附作用,因此,在滑動初始階段即可在H13鋼的磨面快速形成MoS_2摩擦層并穩(wěn)定存在。MoS_2摩擦層的存在不僅對磨面起到保護作用以降低磨損率,同時由于其優(yōu)異的潤滑性能,顯著的降低了摩擦系數(shù),同時也降低了亞表面的塑性變形區(qū)。但對于TC4合金,MoS_2的添加并未顯著降低其磨損率,僅能降低摩擦系數(shù),這可能是由于MoS_2顆粒與TC4基體親和力相對較差,在滑動過程中被擠出磨面所致。當添加Fe_2O_3和MoS_2的混合物時,在所有測試載荷范圍內(nèi)兩種基體的磨損率均在較小范圍內(nèi)波動,趨近于零(TC4合金80%MoS_2除外),且同時獲得較低的摩擦系數(shù)。
[Abstract]:Wear is one of the main failure forms of metal members. It is of great theoretical significance and engineering application value to study the friction and wear properties of metal materials and to improve their wear resistance. The results show that the wear rate can be reduced in varying degrees when there is a stable friction layer with oxide as the main component. However, oxides need to be formed at high temperature or at high speed, so the application of friction layer in reducing wear is limited. In this paper, solid particles were added to the wear surfaces of H13 / GCr15 steel and TC4 / GCr15 steel at room temperature by using a pin-disc friction and wear tester, which promoted the formation of an artificial friction layer to reduce the wear rate of the matrix. The effects of Fe _ 2O _ 3M _ S _ 2 and its mixture on the friction and wear behaviors of the two alloys were studied. The phase, composition, morphology and structure of friction surfaces and profiles were characterized by means of XRDX EDS and SEM, and the wear mechanism under different experimental conditions was discussed. The experimental results show that the artificial friction layer can be formed by adding Fe _ S _ 2O _ 3Mo _ S _ 2 or its mixture to the worn surface, and the formation of artificial friction layer has a significant effect on the wear rate and wear mechanism of H13 steel and TC4 alloy. For H13 steel and TC4 alloy, the wear mechanism is typical abrasive wear and adhesive wear without adding any particles, and the wear rate increases rapidly with the increase of load. At this time, there is no oxide on the surface, that is, there is no friction layer covering the whole surface, and there is obvious plastic deformation and obvious hole on the subsurface of H13 steel. When solid particles are added to the grinding surface, the wear rate decreases to some extent, and a serious to slight wear transition occurs. When Fe _ 2O _ 3 solid particles are added, Fe _ 2O _ 3 particles can be rapidly agglomerated and sintered on the wear surfaces of H13 steel and TC4 alloy, forming an artificial friction layer covering the whole wear surface, which plays a significant protective role on the matrix, but the friction coefficient reaches the maximum at this time. In addition, poor thermal conductivity and high bearing capacity can reduce the subsurface plastic deformation caused by thermal softening to some extent. When MoS2 particles were added, because of the strong adsorption between MoS2 and H13 steel, At the initial stage of sliding, MoSII friction layer can be formed quickly on the wear surface of H13 steel and the existence of the friction layer. MoS2 friction layer not only protects the wear surface to reduce the wear rate, but also reduces the friction coefficient because of its excellent lubricity. At the same time, the plastic deformation zone of the subsurface is reduced. However, the addition of TC4 alloy MoS _ 2 does not decrease the wear rate, but can only decrease the friction coefficient, which may be due to the relatively poor affinity between MoS _ 2 particles and TC4 matrix and the extrusion wear surface during sliding. When Fe _ 2O _ 3 and MoS _ S _ 2 mixtures were added, the wear rates of the two substrates fluctuated in a smaller range in all test load ranges, reaching zero (except for TC4 alloy 80 and MoSflesh _ 2), and a lower friction coefficient was obtained at the same time.
【學位授予單位】：江蘇大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG174.4

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