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  本文選題：碳化鎢 + 耐磨添加劑�。� 參考：《沈陽工業(yè)大學(xué)》2015年碩士論文

【摘要】：針對耐磨零部件在高強度、高硬度、高磨損等惡劣工況下服役壽命短的技術(shù)難題，采用了加入納米WC陶瓷顆粒作為耐磨相的方法，，以提高耐磨件如截齒體的耐磨性�？紤]到WC密度過大，熔煉過程中易產(chǎn)生偏析的特點，實驗中將納米級WC粉與其他金屬粉料混合，壓制成形，并經(jīng)高溫?zé)Y(jié)制成耐磨添加劑。該添加劑能否有效解決成分偏析問題，需要通過熔煉澆鑄后的樣品來驗證。試驗中將該添加劑加入熔融鋼水中，澆鑄成鑄鋼件樣品；采用不同熱處理工藝處理后，對所得試樣進(jìn)行磨損試驗、硬度測試和拉伸測試。采用X射線衍射、掃描電鏡、能譜儀、場發(fā)射掃描電鏡等設(shè)備，檢測分析了耐磨添加劑的燒結(jié)產(chǎn)物和WC在鑄鋼中的分布。通過大量實驗和分析總結(jié)得到如下實驗結(jié)論：磨損實驗結(jié)果證明，基體為40CrNi2Mo的鑄鋼樣品中加入5%～8%的耐磨添加劑，磨損失重量比目前正在煤礦服役的截齒降低約12.8%，即耐磨性優(yōu)于正在服役的截齒。微觀組織檢測分析表明，耐磨相WC主要分布于鋼基體顯微組織中，對提高耐磨性起著至關(guān)重要的作用；組織中的白色區(qū)域是以Fe，Si等元素的氧化物為主，同時含有少量WC和其他金屬的小尺寸夾雜相；黑色區(qū)域氧化物較少。由于碳化鎢與鋼水之間具有良好的潤濕性，因此在熔煉過程中很容易被周圍的鋼水包覆，從而成為鋼水凝固的核心，有效細(xì)化了晶粒；在磨損試驗中，被鋼基組織牢固包覆的WC顆粒很難剝落，且自身的耐磨性很好。這種組織對提高耐磨性有重要作用。高密度耐磨相碳化鎢在鋼基組織中分布均勻，沒有出現(xiàn)任何偏析現(xiàn)象；事實證明，通過制成添加劑方式將高密度組元加入鋼中以避免重力偏析的方法取得了成功。本課題創(chuàng)造性的將該添加劑用于制造采煤機(jī)截齒的研究工作，并取得了較為有效的結(jié)果；改變了截齒體強調(diào)表面強化的傳統(tǒng)思路。
[Abstract]:In order to improve the wear resistance of wear-resistant parts such as tooth cutters, the wear resistance of wear-resistant parts is improved by adding nano-WC ceramic particles as wear resistant phase, aiming at the short service life of wear-resistant parts under bad working conditions such as high strength, high hardness and high wear. Considering the characteristics of high WC density and easy segregation during melting, nano-WC powder was mixed with other metal powder in the experiment, compacted to form, and sintered at high temperature to make wear-resistant additive. Whether the additive can effectively solve the problem of composition segregation needs to be verified by melting and casting samples. The additive was added into molten steel and cast into steel castings. After different heat treatment, wear test, hardness test and tensile test were carried out. By means of X-ray diffraction, scanning electron microscope, energy spectrometer and field emission scanning electron microscope, the sintered products of wear-resistant additives and the distribution of WC in cast steel were examined and analyzed. Through a large number of experiments and analysis, the following experimental conclusions are obtained: the wear test results show that 5wt% wear-resistant additive is added to the cast steel sample with 40CrNi2Mo matrix. The loss weight of grinding is about 12. 8% lower than that of the cutting currently in service in coal mine, that is, the wear resistance is better than that of the gear in service. The microstructure analysis shows that the wear resistant phase WC mainly distributes in the microstructure of steel substrate, which plays an important role in improving the wear resistance, and the white area of the microstructure is mainly composed of the oxides of Fe, Si and other elements. Small size inclusions containing a small amount of WC and other metals, and less oxides in the black region. Because of the good wettability between tungsten carbide and molten steel, it is easy to be coated by the surrounding molten steel in the melting process, thus becoming the core of solidification of molten steel. The WC particles firmly coated with steel-based structure are difficult to peel off and have good wear resistance. This kind of structure plays an important role in improving wear resistance. The high density wear-resistant phase tungsten carbide distributes uniformly in the structure of steel without any segregation phenomenon, and it is proved that the method of adding high-density components into steel by making additives to avoid gravity segregation has been successful. In this paper, the additive is creatively used in the research of cutting teeth of shearer, and more effective results have been obtained, and the traditional thinking of tooth cutting body emphasizing surface strengthening has been changed.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ136.13

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