發(fā)布時(shí)間：2017-12-31 03:26

  本文關(guān)鍵詞：鑄件微觀組織結(jié)構(gòu)三維重構(gòu)技術(shù)研究　出處：《南昌大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 三維重構(gòu) 連續(xù)切片 半固態(tài)壓鑄 定量表征 空間結(jié)構(gòu)

【摘要】：在材料科學(xué)的研究中,科學(xué)的定量表征和實(shí)驗(yàn)觀察一直是材料三維微觀結(jié)構(gòu)形態(tài)研究的核心問題。而三維重構(gòu)是顯示三維結(jié)構(gòu)最基本的方法,提供全面真實(shí)而準(zhǔn)確的三維空間組織信息。通過工藝來控制材料成形過程,從而控制得到所需要的微觀結(jié)構(gòu),是科研工作者的研究目標(biāo)。本研究提出了本實(shí)驗(yàn)室中基于連續(xù)切片法三維重構(gòu)基本操作流程,及三維組織定量表征分析方法。運(yùn)用三維重構(gòu)方法,重構(gòu)獲得不同工藝條件下鑄件的三維微觀組織,并進(jìn)行定量表征分析。通過對(duì)實(shí)驗(yàn)產(chǎn)品中各鑄件內(nèi)初生相組織和共晶相組織進(jìn)行三維重構(gòu),開辟了在三維的基礎(chǔ)上對(duì)鑄件進(jìn)行定量表征和研究分析的新方法,這對(duì)流變成形工藝有著實(shí)際指導(dǎo)意義。重構(gòu)結(jié)果分析表明,三維和二維形貌的微觀組織所反映的數(shù)據(jù)信息有很大不同。重構(gòu)得到在液態(tài)鑄造工藝條件下A356鋁合金三維枝晶組織,測(cè)得某單個(gè)枝晶組織中相鄰二次枝晶間距約23.94μm,一次枝晶主軸長(zhǎng)338.58μm,兩個(gè)二次枝晶夾角約29.63°。對(duì)半固態(tài)鑄造條件下A356鋁合金中單個(gè)橢球晶進(jìn)行三維重構(gòu),測(cè)得橢球晶的長(zhǎng)軸為91.29μm,短軸為72.19μm,橢球晶的表面積S=21618.01μm2,而體積V=285457.52μm3,平均球徑D=81.71μm,經(jīng)過計(jì)算球整度F=0.91。重構(gòu)液態(tài)輪轂壓鑄件中單個(gè)枝晶組織,其總體積約為V=11115861.13μm3,實(shí)體總表面積S=1219573.59μm2。重構(gòu)得到鑄件中縮孔缺陷的內(nèi)空腔三維實(shí)體形貌,經(jīng)測(cè)量得內(nèi)空腔表面積為2705.81μm2,裹氣容量約為9749.71μm3�？s孔內(nèi)空腔中有很多針尖狀的凸起和凹槽,表面并不光滑。所重構(gòu)的半固態(tài)壓鑄件中初生相總體積約為178274564.33μm3,整個(gè)實(shí)體總體積約為236044691μm3,經(jīng)計(jì)算得固相分?jǐn)?shù)F為0.76。對(duì)初生相的局部區(qū)域進(jìn)行三維重構(gòu),發(fā)現(xiàn)初生相近球晶之間大部分互相融合連接在一起。利用剖切功能得到各種剖切視圖,對(duì)所需要研究的區(qū)域進(jìn)行更加細(xì)致化的研究。在透明模式下觀察研究初生相微觀組織結(jié)構(gòu)的三維實(shí)體形貌更加方便明了,甚至可以在組織內(nèi)部進(jìn)行三維空間測(cè)量研究。
[Abstract]:In the research of material science, the quantitative characterization and experimental observation of science have been the core problem in the study of three-dimensional microstructure and morphology of materials, and three-dimensional reconstruction is the most basic method to display three-dimensional structure. To provide comprehensive, true and accurate three-dimensional spatial organization information. Through the process to control the material forming process, thus control the required microstructure. In this study, the basic operation flow of 3D reconstruction based on serial slice method and the method of quantitative characterization of 3D tissue in our laboratory were put forward, and the method of 3D reconstruction was used. The 3D microstructure of the castings under different technological conditions was obtained and analyzed quantitatively. The primary phase structure and eutectic phase structure in the castings were reconstructed by 3D reconstruction. A new method for quantitative characterization and analysis of castings on the basis of 3D is developed, which is of practical significance to the rheological forming process. The three-dimensional dendritic structure of A356 aluminum alloy was obtained by reconstructing the microstructure of A356 aluminum alloy under liquid casting conditions. In a single dendritic structure, the adjacent secondary dendritic spacing is about 23.94 渭 m and the primary dendritic spindle length is 338.58 渭 m. The angle between the two secondary dendrites is about 29.63 擄. The single ellipsoidal crystal in A356 aluminum alloy is reconstructed by 3D reconstruction under semi-solid casting condition. The long axis of the ellipsoid is 91.29 渭 m. The short axis is 72.19 渭 m, the surface area of ellipsoidal crystal is 21618.01 渭 m 2, and the volume is 285457.52 渭 m 3, the average diameter of sphere is 81.71 渭 m. The single dendritic structure in the liquid hub die casting was reconstructed with the total volume of V _ (11115861.13) 渭 m ~ (3). The surface area of the internal cavity is 2705.81 渭 m ~ 2. The internal cavity surface area of the casting is 2705.81 渭 m ~ (2), and the internal cavity surface area of the casting is 2705.81 渭 m ~ (2). The gas wrapping capacity is about 9749.71 渭 m ~ (3). There are many pinnacular protrusions and grooves in the cavity of the shrinkage. The surface is not smooth. The total volume of the primary phase is about 178274564.33 渭 m ~ 3 and the total volume of the whole solid is about 236044691 渭 m ~ 3 in the reconstructed semi-solid die casting. The solid fraction F is 0.76. The local region of the primary phase is reconstructed. It is found that most of the primary spherulites are fused and connected together, and various cutting views are obtained by using the cutting function. In the transparent mode, it is more convenient to observe and study the three-dimensional morphology of the microstructure of the primary phase. It may even be possible to conduct three-dimensional spatial measurements within an organization.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG24

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 吳艷軍,陳振華;半固態(tài)金屬觸變性質(zhì)及應(yīng)用新進(jìn)展[J];特種鑄造及有色合金;2001年01期

2 劉艷華;熊洪淼;郭洪民;王家宣;楊湘杰;;半固態(tài)A356鋁合金流變擠壓鑄造工藝[J];特種鑄造及有色合金;2008年02期

相關(guān)碩士學(xué)位論文 前1條

1 楊志剛;多晶體材料微觀組織結(jié)構(gòu)的計(jì)算機(jī)重構(gòu)[D];蘭州理工大學(xué);2008年

，

本文編號(hào)：1357899