本文關(guān)鍵詞：鎳包WC激光熔覆工藝及熔覆層特性研究，，由筆耕文化傳播整理發(fā)布。

網(wǎng)友Alphago近日為您收集整理了關(guān)于鎳包WC激光熔覆工藝及熔覆層特性研究的文檔，希望對您的工作和學(xué)習(xí)有所幫助。以下是文檔介紹：中圖分類號:TG665 論文編號:102870515-S029學(xué)科分類號:080201 碩士學(xué)位論文鎳包WC激光熔覆工藝及熔覆層特性研究研究生姓名馮君學(xué)科、專業(yè)機(jī)械制造及其自動化研究方向特種加工指導(dǎo)教師田宗軍教授南京航空航天大學(xué)研究生院機(jī)電學(xué)院二О一五年三月Nanjing University of Aeronautics and AstronauticsThe Graduate SchoolCollege of Mechanical and Electrical EngineeringResearch on NicoatedWC lasercladding processandcladdinglayer characteristicsA Thesis inMechanical Manufacture and AutomationbyFengJunAdvised byProf. Tian ZongjunSubmitted in PartialFulfillmentof the Requirementsfor the DegreeofMaster of EngineeringMarch, 2015承諾書本人聲明所呈交的博/碩士學(xué)位論文是本人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。除了文中特別加以標(biāo)注和致謝的地方外,論文中不包含其他人已經(jīng)發(fā)表或撰寫過的研究成果,也不包含為獲得南京航空航天大學(xué)或其他教育機(jī)構(gòu)的學(xué)位或證書而使用過的材料。本人授權(quán)南京航空航天大學(xué)可以將學(xué)位論文的全部或部分內(nèi)容編入有關(guān)數(shù)據(jù)庫進(jìn)行檢索,可以采用影印、縮印或掃描等復(fù)制手段保存、匯編學(xué)位論文。(保密的學(xué)位論文在解密后適用本承諾書)作者簽名:日期:南京航空航天大學(xué)碩士學(xué)位論文I摘要激光熔覆技術(shù)作為提高金屬表面性能的方法,可有效提高零件的硬度、耐磨和抗蝕性,具有廣泛的應(yīng)用前景,因此,研究涂層成型工藝及涂層性能是很有意義的。本文闡述了激光熔覆技術(shù)的工藝方法及特點(diǎn),分析了激光熔覆涂層裂紋的形成機(jī)理,并對熔池及金屬材料在激光作用下的熔凝機(jī)理進(jìn)行了研究。通過工藝試驗(yàn),制備了高硬質(zhì)鎳包WC涂層,并對涂層微觀組織形貌及成分、涂層硬度、涂層耐磨性進(jìn)行了較為系統(tǒng)的分析研究,主要研究內(nèi)容如下:(1)從金屬材料在激光作用下的熔凝機(jī)理出發(fā),對激光熔覆的熔池形成以及裂紋的產(chǎn)生機(jī)理進(jìn)行研究,為工藝試驗(yàn)提供一定的理論基礎(chǔ)。(2)通過對激光功率、掃描速率、預(yù)熱溫度等工藝參數(shù)的正交試驗(yàn),制備大量的鎳包WC涂層,分析各工藝參數(shù)對涂層宏觀形貌及裂紋敏感性的影響。(3)研究涂層微觀組織形貌,通過SEM、EDS、XRD的檢測,分析涂層的成分及物相的構(gòu)成,同時分析工藝參數(shù)對微觀組織的影響。(4)對涂層硬度進(jìn)行研究,分析工藝參數(shù)對涂層顯微硬度的影響,及涂層不同深度的顯微硬度分布。(5)測試涂層的耐磨性能,對不同硬度的涂層與基體材料的耐磨性進(jìn)行比較,比較其摩擦系數(shù)、磨損量和磨損形貌的差別。關(guān)鍵詞:激光熔覆,組織形貌,顯微硬度,耐磨性能鎳包WC激光熔覆工藝及熔覆層特性研究II南京航空航天大學(xué)碩士學(xué)位論文IIIAbstractLaser cladding technology, as a way to improve the performance of the metal surface, which can effectively improve the hardness, wear resistance and corrosion resistance of parts, has wide application prospect.Therefore, the studyof coating forming process and coating properties is very meaningful. This paper expounds the methods and characteristics of laser cladding technology, analyzes the formation mechanism of laser cladding coating crack, and studies the fusingmechanism ofmolten pool and metal materials under the effect of laser. Through the process experiment, high rigid Ni capped WC coating was prepared, andhave a systematic analysis and researchofthe coating microstructure morphology position, coating hardness, wear resistance coatingwere carried on. The main research content is as follows: (1) From the fusingmechanism of metal materials under the effectof laser, the laser cladding of the molten pool formation and mechanism of crack formation werestudied, providing certain theoretical basis for process test. (2) By orthogonal experimentoflaser power, scanning rate, preheat temperature and other process parameters,lots of Ni cappedWC coatingwas processed, and the analysis for various process parameters on the coating and the influence of the crack sensitivitywere conducted. (3) Research on coating microstructure morphology by SEM, EDS and XRD testingand analysis of position and pos

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  本文關(guān)鍵詞：鎳包WC激光熔覆工藝及熔覆層特性研究，由筆耕文化傳播整理發(fā)布。