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1、Y10ll；¨五分類號(hào)：—j魚睡一uDc汁1：繾二篁江：薛太lI
2、i擎JlANGSUUNlVERSlTY密級(jí)：壓丑一碩士學(xué)位論文MASTER’SDISSERTATl0N論文題目：—j塹絲壟墮縫邋坐魚疊墼型羔—二學(xué)科專業(yè)：必魁盤圣圣．整．一作者姓名：逃蛆一指導(dǎo)教師：一隧：到答辯日期：迎絲2笪：』!江蘇大學(xué)碩士學(xué)位論文摘要半固態(tài)金屬加工(半廚態(tài)成形)技術(shù)是近年來(lái)金屬加工技術(shù)研究的熱點(diǎn)，通過(guò)該技零形成的零件具有尺寸糖度離、表醚質(zhì)量高翻蛙麓好等特點(diǎn)。鋁合金半固態(tài)成形技術(shù)為汽車工業(yè)、航空工業(yè)所急需，而制備菲樹(shù)枝晶的半固態(tài)坯料
3、是鍋臺(tái)金半固態(tài)成形的關(guān)鍵技術(shù)之一。本文在概述半固態(tài)坯料制備方法研究現(xiàn)狀艙基蓉爨～t-，提出半固態(tài)坯料制備方法的優(yōu)化措施，分別采用低溫鑄造法和電磁攪拌方法制備亞共黥鎬硅合金半固態(tài)坯料。對(duì)低溫鑄造和電磁攪拌時(shí)菲棱潞縫織秘形成枧理進(jìn)行了分析探討。磷究表明，優(yōu)化低濫鑄造翻電磁攪拌的工藝參數(shù)，戇夠利備性能優(yōu)越憋拳固態(tài)坯料。針對(duì)低溫鑄造方法制取的坯料中存在的縮松缺陷，本文提出采用吹入氮?dú)馓庤姆椒?，秘＆是逶過(guò)氣泡群懿運(yùn)動(dòng)來(lái)誘發(fā)液體的環(huán)漉運(yùn)動(dòng)，從而促進(jìn)液體的流動(dòng)，增加金屬的補(bǔ)縮能力，從而減少縮松甚至使其游失。通過(guò)數(shù)值推導(dǎo)和模擬試
4、驗(yàn)，對(duì)凝霹過(guò)程中歐入氮?dú)獬纬趟傻臋C(jī)理進(jìn)行了初步攘討。關(guān)鍵嗣：弧共爵錙硅合金；半圓態(tài)成形坯料；低溢鑄造法；露磁攪拌法；氮?dú)鈹嚢杞K大學(xué)碩士學(xué)位論文OptimumFabricationTechniquesofSemi—SolidFonningBilletsA8STRACTSemi—solidforming(SSF)hasbecomethefocusofstudiesonmetalformingtechniquesinrecentyears．Thecomponentsobtainedbyusingthistechniq
5、uehavenotonlyhi曲dimensionprecisionandgoodsurfacequatity；butalsogoodproperties．SSFofaluminumalloysisnecessaryinbothautomobileindustry"andspaceindustr)：Theproductionof1301"I—dendriticsenti—solidbilletisoneofthekeytechniquesintheSSFofaluminumalloys，F(xiàn)ollowingarevi
6、exvofpreviousresearchworksoilfabricationtechniquesofsemi—solidformingbillets，theoptimizationoftbefabricationtechniquesofsemi—solidframingbilletsusinglowtemperaturecastingandelectromagneticstirring(EMS)，respectively,hasbeencarriedout。TheformationmechanismsofnOD
7、—dendriticmicmstructmeinbilletsobtainedbyusingthesetwoteclmiqueshavebeenstudied．Itishldicatedthatthesemi—-solidformingbilletshavegoodmechanicalpropertiesastheprocessparametel＼,；havebeenoptimized．Astherearemieroporositiesinthebilletsobtainedbylowtemperaturecast
8、ing，nitrogenstirringhasbeenemployedinthecurrentresearchtoinducetheconvectionofliquidaluminumalloy．TheinstantaneousimpactpowerisformedwhenthenitrogenbubblestransgressthesurfaceofliquldaluminumandbreakThispowercarldrivetheflowageofliquidaluminumandimprove狂sfilli
9、ngability．Thus，themieropomsitiescanhereducedoreveneliminated．Accordingtomathdeductionandexperimentalsimulation，themechanismoftheinfluenceofthenitrogenstirringduringthesolidificatio
