本文選題：耐磨軸承合金 + 鋁青銅��； 參考：《安徽工程大學(xué)》2015年碩士論文

【摘要】：合金的凝固行為及組織性能都與合金熔體結(jié)構(gòu)有著密切的關(guān)系。當(dāng)前,合金化、快速凝固法和形變熱處理等方法是合金組織性能改善的主要方法,而采用熔體過(guò)熱處理工藝誘導(dǎo)合金熔體的結(jié)構(gòu)發(fā)生改變,進(jìn)而改善合金的凝固過(guò)程、凝固組織和性能仍然是經(jīng)驗(yàn)性的。本文以三種典型的耐磨工業(yè)合金(SnSb11Cu6、Al-20Sn、QAl10-44)為研究對(duì)象,通過(guò)熔體電阻率的變化研究熔體結(jié)構(gòu)的變化規(guī)律,從而對(duì)合金進(jìn)行熔體過(guò)熱處理,探索溫度誘導(dǎo)的熔體結(jié)構(gòu)轉(zhuǎn)變對(duì)SnSb11Cu6、 Al-20Sn、QAl10-4-4三種合金凝固組織及力學(xué)性能的影響。課題研究?jī)?nèi)容與結(jié)論如下：1.通過(guò)探討合金(SnSb11Cu6、Al-20Sn、QAl10-4-4)熔體的電阻率-溫度關(guān)系,實(shí)驗(yàn)顯示隨溫度的升高,合金在一定的溫度區(qū)間內(nèi)發(fā)生了不同特征的異常突變。2.對(duì)合金(SnSb11Cu6、Al-20Sn、QAl10-4-4)進(jìn)行凝固實(shí)驗(yàn),通過(guò)凝固后金相組織觀察、EDS分析及ⅪD測(cè)試對(duì)比發(fā)現(xiàn),經(jīng)熔體過(guò)熱處理后的合金凝固組織明顯細(xì)化,合金相的分布更加均勻。分析認(rèn)為這可能是熔體中的類(lèi)固型原子團(tuán)簇經(jīng)高溫過(guò)熱結(jié)構(gòu)被打破,從而對(duì)合金的凝固組織存在一定的影響。3.通過(guò)對(duì)合金(SnSb11Cu6、Al-20Sn、QAl10-4-4)合金摩擦磨損實(shí)驗(yàn)對(duì)比發(fā)現(xiàn),經(jīng)熔體過(guò)熱處理后的合金摩擦磨損性能得到了明顯的改善,合金的摩擦系數(shù)明顯減小,磨損量變小,硬度增加。分析認(rèn)為,經(jīng)熔體過(guò)熱后的合金凝固組織的細(xì)化和均勻的網(wǎng)狀分布在很大程度上改善了摩擦磨損過(guò)程中較深的犁痕和粘著的發(fā)生,并且網(wǎng)狀的結(jié)構(gòu)還能儲(chǔ)存潤(rùn)滑油,從而改善了合金的耐磨性能。4.分別在一定的溫度和外加應(yīng)力條件下,對(duì)SnSb11Cu6、QAl10-4-4合金的蠕變拉伸實(shí)驗(yàn)比較發(fā)現(xiàn),經(jīng)熔體過(guò)熱處理后的合金試樣蠕變第一階段時(shí)間縮短,穩(wěn)態(tài)蠕變階段的蠕變速率明顯減小,穩(wěn)態(tài)階段時(shí)間延長(zhǎng),蠕變時(shí)間較長(zhǎng),整個(gè)試驗(yàn)過(guò)程的蠕變變形量明顯小于未經(jīng)熔體結(jié)構(gòu)轉(zhuǎn)變的合金。充分說(shuō)明經(jīng)熔體結(jié)構(gòu)轉(zhuǎn)變的合金的蠕變性能得到明顯的改善。
[Abstract]:The solidification behavior and microstructure and properties of the alloy are closely related to the melt structure.At present, alloying, rapid solidification and thermomechanical treatment are the main methods to improve the microstructure of the alloy.Solidification structure and properties are still empirical.In this paper, three typical wear-resistant industrial alloys, SnSb11Cu6AL-20SnOQAl10-44) were studied. The changes of melt structure were studied by the change of melt resistivity, and the melt superheat treatment was carried out.The effect of melt structure transformation induced by temperature on solidification microstructure and mechanical properties of SnSb11Cu6, Al-20SnAQAl10-4-4 alloys was investigated.The research contents and conclusions are as follows: 1.The relationship between resistivity and temperature of Sn-Sb11Cu6AL-20SnOQAl10-4-4) melts was investigated. The experimental results show that with the increase of temperature, the alloy has different characteristics of abnormal mutation in a certain range of temperature.The solidification experiments were carried out on SnSb11Cu6Al-20SnAQAl10-4-4). The microstructure of the alloy after solidification was observed by EDS analysis and compared with the analysis of XI D. It was found that the solidified microstructure of the alloy after melt superheat treatment was obviously refined and the distribution of the alloy phase was more uniform.It is believed that this kind of solid atom cluster in the melt is broken by superheated structure at high temperature, which has a certain influence on the solidification structure of the alloy.By comparing the friction and wear experiments of SnSb11Cu6Al-20SnAQAl10-4-4) alloy, it is found that the friction and wear properties of the alloy after melt superheat treatment have been obviously improved, the friction coefficient of the alloy has been obviously reduced, the wear volume has decreased and the hardness of the alloy has been increased.The analysis shows that the refinement and uniform distribution of solidified microstructure after melt overheating can greatly improve the occurrence of ploughing and adhesion in the process of friction and wear, and the reticular structure can store lubricating oil.Thus, the wear resistance of the alloy was improved.The creep tensile tests of SnSb11Cu6OQAl10-4-4 alloy under certain temperature and applied stress respectively show that the first stage of creep time is shortened and the creep rate of steady state creep phase is obviously reduced after melt superheat treatment.The time of steady state is prolonged and the creep time is longer. The creep deformation of the whole test process is obviously smaller than that of the alloy without melt structure transformation.It is shown that the creep property of the alloy transformed by melt structure has been improved obviously.
【學(xué)位授予單位】：安徽工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TG135.6

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相關(guān)期刊論文 前1條

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本文編號(hào)：1767617