發(fā)布時(shí)間：2021-10-14 13:03

　　B390合金（ASTM standard）具有良好的耐磨性和高硬度性能,廣泛應(yīng)用于汽車領(lǐng)域,如發(fā)動(dòng)機(jī)缸體、活塞、制動(dòng)缸體等。然而,B390合金在鑄造過程中,特別是壓鑄過程中,易于出現(xiàn)粘膜現(xiàn)象,即合金粘連到鑄造中所用的鋼質(zhì)模具表面。因此,在工業(yè)領(lǐng)域中使用B390合金的主要問題是清潔模具表面的合金引起的生產(chǎn)暫停,以及最終損害模具表面導(dǎo)致模具的失效。并且,盡管在過去人們對(duì)亞共晶鋁合金（A380）的粘模機(jī)理已經(jīng)進(jìn)行了大量研究,但對(duì)過共晶鋁合金的粘模機(jī)制卻很少關(guān)注。本文的研究目的是分析過共晶鋁合金的粘模機(jī)理,并找到一種能夠阻礙B390合金粘模的相關(guān)方法。本研究中所用的B390合金試樣,來自美國(guó)GM公司。本文首先是探究了影響粘模機(jī)制的因素,并且與過去其他研究者在粘模方面所做的工作進(jìn)行了比較�；诖�,將B390合金樣品放置于Si-C坩堝中,通過微波反應(yīng)器加熱使之熔化,隨后對(duì)H13鋼棒進(jìn)行熱浸鍍鋁,即將鋼棒放入熔體浸泡。然后將H13棒在室溫下依次冷卻、切割、拋光,最后使用掃描電子顯微鏡（SEM）對(duì)浸鋁后的H13棒的截面進(jìn)行形貌觀察以及EDS分析。實(shí)驗(yàn)結(jié)果與先前的研究工作所表明的溫度,時(shí)間和柵極速度對(duì)粘... 

【文章來源】：上海交通大學(xué)上海市 211工程院校 985工程院校 教育部直屬院校

【文章頁(yè)數(shù)】：115 頁(yè)

【學(xué)位級(jí)別】：碩士

【文章目錄】：
摘要
ABSTRACT
Chapter1:Introduction
Chapter2:Die Soldering Literature Background Analysis
    2.1 Background:thermal wear of high-pressure die casting dies
        2.1.1 Die characteristics and damaging causes
        2.1.2 Damaging scenarios of the die
    2.2 The die soldering mechanism
        2.2.1 Shankar's model:A six-step mechanism
        2.2.2 Han's model:the existence of a critical temperature
        2.2.3 Zhu's model:a thermodynamic energy criterion
        2.2.4 Conclusion
    2.3 Factors affecting die soldering
        2.3.1 Temperature
        2.3.2 Alloying elements in the melt
        2.3.3 Alloying elements in the die
        2.3.4 Surface condition of the die
        2.3.5 Alternative die materials
        2.3.6 Modification treatments
        2.3.7 Gate velocity
    2.4 Die coatings and surface treatments
        2.4.1 Die coatings overview
        2.4.2 Surface treatments overview
        2.4.3 Conclusion
Chapter3:Experimental Setup and Plan for Analysis of Die Soldering
    3.1 Experimental setup and plan
    3.2 Quantifying the influence of erosion
        3.2.1 Experimental setup
        3.2.2 Experimental results and discussion
Chapter4:Analysis of the Die Soldering Mechanism between H13 Tool Steel and B390 Hypereutectic Aluminum
    4.1 Intermetallic layer composition study
        4.1.1 Preliminary observations
        4.1.2 Analysis of the composition of the ternary layer
        4.1.3 Analysis of the composition of the binary layer
        4.1.4 Analysis of the expanded intermetallic layers
        4.1.5 Preliminary conclusions
    4.2 Intermetallic layer growth rate study
        4.2.1 Measurements method
        4.2.2 Growth rate study of the binary layer
        4.2.3 Growth rate study of the ternary layer
        4.2.4 Overall layer growth rate calculation
        4.2.5 Preliminary conclusions
    4.3 Discussion
        4.3.1 Diffusion modelling
        4.3.2 The influence of Si on the growth rate of the intermetallic layer
        4.3.3 The Influence of Si on the die life
    4.4 Additional experiments with A380 aluminum
        4.4.1 Experiment motivations
        4.4.2 Results and discussion
    4.5 Conclusion
Chapter5:Study on the Influence of Chromium Plating and Nitride Surface Treatment
    5.1 Experimental plan
    5.2 Results and discussion
Chapter6:Conclusion
Acknowledgements
Bibliography



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