热轧q235钢热模拟试验及晶粒细化技术研究

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1、东南丈学硕士学位论文摘要为了探索东梅出热连转氧梳土窦戮热耗黪鞍钢Q235镪缀晶糙瓣超缨传工艺，基{二工照热连乾轧钢生产条件，在热模拟试验机上进行压缩变形试验。研究了变形工艺参数(变形瀛度、成变速率、冷却遵度等)对Q235钢晶糨细化的影响，井研究了变形过程中低碳钢的形变诱导铁索体演变和动态再缀蘸现象，确立7超露纯主要工芑参数。嗣无变形条{牛超陡，A#溢嶷跌上变形S＆够明显缨偬铁繁体晶粒尺寸秘撵翱快冷中产生的魏氏缀织等虽徽鳙织瀚形成；考变群溢度低时，拣种作用更加明媳。僵肖变形濂葭低于An对，得到混蕊编织。变形爨较茯静冷击

2、】遘嶷霄稳予得翻较辎豹铁豢体晶毂。应变遮率0，ls"’嚣试样鼙域溜薅缀缓，

3、随变遮率迭鲻191蘑，最粒分布毖较均匀，虽稳为繁璐状。妪蓑鹿燮遮率镌提裹，铁素体菇粒尺寸变大。三道次爱形对{氐碳铺龋粒缩织桶细化徽聚和荤道次窝形效果一致，随着变形温度酮下降，铁素俸菇粒尺寸褥黉绥纯，并麓蠡粒尺寸均匀憾也褥蠹提嵩。低碳钢簌临界奥氏俸醒燮黪戆够发生澎交诱导锻素髂翱燮，萁形棱秘话《是一个反复澎缓匏落棱不饱和过程，邀是其懿有超绷晶的主要原因。随着禽变赞的增加，澎变诱罨铁索体数最增加，值魁其转交盼数壤霄一个壤隈，嬲变形鬣继续增潮对，发生形黛落导铁索体游渤态同炙和动淼蒋结晶。An湿度强上交缮舞豹曝溢避糕中形交诱导铁索体发垒逆襁燮，嗣时还发生了铁囊体菇粒的褪健现象。确定7主要工艺参数鸯：缀

4、坯魏热溢壤为1150℃～12∞℃，箍筑缮粜瀛度约为1050。C，耩轧进鼹攥发鳃冀980℃，糕乾终簸溢凄戈B20'C，巷取滚魔必5504C。关键镬：鑫粮绷亿t热模拱，熬韩镶裁，羧莪控冷，影燮诱弹铁索傣耜变，褥结菇：查塑查兰堡圭鲎笙笙塞一一。．ABSTRCTInordertostudythetechniqueofgrainrefmementofhotrolledstripQ235steelonthecontinuousrollingmillinMei蠡allcompany,thecompressiontestsweretakenontheGleblee-3500themo—mechanicais

5、imulatorbasedontheconditionofindustrialhotrollingproduction．Theinfluencesofdeformationparameters(temperature、deformationvelocity、coolingrate)ongrainrefinementofQ235steelwerestudied．Thedynamicrecrystalliztionandtheevolvementofdeformationinducedtransformationferriteinlowcarbonsteelduringdeformaionwer

6、ealsostudiedThetechniqueparameterswereestablished。Comparisonwithundeformation，deformationaboveABcatlrefinegrainofferri如andrestrainformofwidmanstattenmicrostrecture．thefunctionsbecomemoreobviouswitllthedeformationtmeperaturedecreasing．Butmixedsizegrainmicrostructureappearswhenthedeformationtemperatu

7、reisbelowAt3．Highcoolingrateafterdeformationpromoteappearanceofthefineferritegrain．Thesampledeformationwi淮velocityof0．1s11hasthemixeds{zemicrostructure，andwhenthevelocityexceedIs-1。theferritegrainsbecomehomogeneousandexuiaxed．Thefemtegrainsbecomecoarsewiththedeformationvelocityincreasing．弧eeffectof

8、gfainrefinementofthree-passdeformationisconsistentwithtlmtofsingle-passdeformation．Thegrainsofferritebecomefineandhomogeneouswiththedeformationtemperaturedecreasing．DeformationinducedferritetransformationOC