简介：1复合材料概述1．1关于复合材料的定义在工业和日常生活用具中，为了提高构件的使用寿命。改善使用功能、节省贵重材料。常常采用复合材料。广义的复合材料是指：由两种或多种性质不同的材料通过物理和化学复合，具有两个或两个以上相态结构的材料。例如：热敏元件、压电元件用的双金属复合材料和建筑材料中新型墙体和屋面材料都叫复合材料。但它们的层间结合力相距甚远．有着本质的不同。

简介：High-strengthsteelshavebeenwidelyappliedtoautomotivechassisparts.Inordertoformcomplexshapes,highholeexpansionratesandhighformabilityarerequired.Dualphase(DP)steelhasagoodformability,butapoorholeexpansionrate.Inthiscircumstance,anotherkindofsteelwhichhasamicrostructureofferrite-bainite,ratherthanferrite-martensite,hasbeenfoundtobeanalternativesolution.ItiscalledFBsteel.ThissteelwithSi,CandMnadditionsareappliedinthisstudy.Atwo-stepcooling...

简介：ItisfundamentallyimportanttounderstandtheinfluenceofstrainonthedensityofdeformationtwinsinTWIPsteelbecausetwinningisitsdominantdeformationmechanism.ThedeformationbehaviorofaFe-30Mn-4Si-3Al-0.097CsteelhasbeeninvestigatedbyX-raydiffraction(XRD),electronbackscatterdiffraction(EBSD)andtransmissionelectronmicroscopy(TEM)techniques.Samplewithanaveragegrainsizeof10μmwasdeformedincold-rollingwithareductionof10%,20%,30%,40%,50%,60%and70%,respectively.Themechanicalpropertiesofthecold-rolledsampleswerefurtherinvestigatedbytensiletests.Theyieldstrength(σy)andultimate-tensile-strength(σUTS)oftheas-preparedsampleis480MPaand850MPa,respectively.However,undercoldrollingdeformation,thetensilestrengthobviouslyincreaseswithanincreaseinrollingreduction.Thesamplewitharollingreductionof10%exhibitsσyof610MPaandσUTSof-1000MPa.Theyieldstrengthandtensilestrengtharefurtherenhancedupto1320MPaand1378MPaforthespecimenwitharollingreductionof70%,regardlessofthepoorductilityof6.7%.ThedeformationmicrostructureswerestudiedbyEBSDandTEMobservations.Itisfoundthat,withincreasingrollingreduction,theaveragedistancebetweendeformationtwinsdecreasesgraduallywhilethedensityofdeformationtwins(thelengthoftwinboundaryinunitarea)exhibitamaximumvalueat40%cold-rolling+tension.Carefullystatisticsanalysisrevealsgrainorientationiscloselyrelatedtothedeformationtwinsandtheunderlyingmechanismgoverningthetwinningisdiscussed.

简介：研究不同碳源下Al2O3-SiC-C铁钩料的性能。分别以球沥青、焦炭和炭黑为碳源,比较了常温下三者的显气孔率、抗折和抗压强度。结果表明,不同种类碳源将对试样的气孔率和抗折强度产生不同程度的影响。

简介：通过改进耐火材料及辅料中Al2O3含量的分析方法,解决了传统分析方法存在滴定终点判断不准、低含量Al2O3分析准确性差的缺点。经大量试验数据证明,改进后的方法可以替代传统分析方法。

简介：Thisstudyaimstoinvestigatetheeffectofthe1-stepquenchingandpartitioning(Q&P)processonthemicrostructureandtheresultingVicker’shardnessof0.3C-1.5Si-1.5Mnsteelbyusingin-situdilatometry,opticalmicroscopy(OM),scanningelectronmicroscopy(SEM),X-raydiffractometry(XRD),andVicker’shardnessmeasurement.Systematicanalysesindicatethatthemicrostructureofthespecimensquenchedandpartitionedat150℃,200℃,250℃,and300℃mainlycompriseslathmartensiteandretainedaustenite.Thedilatometrycurveofthespecimenpartitionedat150℃ispresumablyascribedtotheformationofisothermalmartensite.Intheearlystagesofpartitioningat200℃,thenearlyunchangeddilatationcurveiscloselyrelatedtothesynergisticeffectofisothermalmartensiteformationandtransitionalepsiloncarbideprecipitation.Inthelaterstagesofpartitioningat200℃,theslightincreaseinthedilatationcurveisduetothecontinuousisothermalmartensiteformation.Withfurtherincreaseinpartitioningtemperatureto250℃,thedilatationincreasesgraduallyupto3600s,whichisrelatedtocarbonpartitioningandlowerbainiteformation.Partitioningatahighertemperatureof300℃causesarapidincreaseinthedilatationcurveduringtheinitialstages,whichsubsequentlylevelsoffuponprolongingthepartitioningtime.Thisismainlyattributedtotherapiddiffusionofcarbonfromathermalmartensitetoretainedausteniteandcontinuousformationoflowerbainite.

简介：采用退火工艺来消除钢锭内应力、减少化学成分偏析及显微组织的不均匀性,适当调整制造工艺,在不增加成本的前提下,锻造出合格的锻件,并最终加工成符合技术要求的产品。

简介：针对60Si2Mn弹簧圆钢在拉伸试验中发生脆断的失效样品进行断口、夹杂物、金相组织等分析检验,发现脆断的主要原因与热处理过程中的淬火温度、回火时间及操作程序均有较密切的关系。

简介：介绍高速铁路用弹簧钢38Si7线材生产技术要求和工艺开发过程,从孔型系统、料型制度、生产管理等方面进行了优化,逐渐扩大南钢高速铁路用弹簧钢38Si7线材市场占有力。

简介：通过对国家标准中60Si2Mn弹簧圆钢试样热处理工艺的试验和改进,提出了适合鄂钢产60Si2Mn弹簧圆钢试样的热处理工艺,满足了国家标准对60Si2Mn弹簧圆钢各项力学性能指标的要求。

简介：Theeffectsofthefinalelectromagneticstirring(EMS)onthesolidificationstructureof60Si2CrVAThighstrengthspring(HSS)steelofcontinuouscasting(CC)billetshasbeenstudied.Theanalysisofthesolidificationstructureisbasedonthecomparisonbetweenthemacrostructure,microstructure,carbonsegregationanddefectsofthe60Si2CrVATbilletwithmold-electromagneticstirring(M-EMS)andthosewiththeM+finalsolidificationzoneelectromagneticstirring(F-EMS).ItisfoundthatthesolidificationstructureofthebilletwiththeF-EMSisimprovedwiththetightnessofthebilletandtheincreaseintheratiooftheequiaxedstructure,theinnerporosityandtheshrinkageareremarkablyreduced,andthattheratioofcentralcarbonsegregationsharplydecreases.Meanwhile,thesecondarydendritearmspacing(SDAS)isimproved,andtheratioofcentralequiaxedgrainconsiderablyincreases,whichresultsinfinergrains.Therefore,thequalityofthebilletisenhancedwiththeF-EMS.

简介：文章简单介绍了60Si2MnT铁路Ⅲ型弹条用钢现状,叙述了鄂钢生产Ⅲ型弹条用钢的工艺研究及过程控制情况以及试生产结果。

简介：ThemicrostructuralchangesofFe83Si4B13amorphousmotheralloyduringtheheatingprocesswereinvestigatedbyLaserScanningConfocalMicroscopy（LSCM）,andthephasetransformationwasdeterminedbytheThermo-Calccalculations.ThedifferencesinthemeltingpointsmeasuredbyDifferentialScanningCalorimetry（DSC）andLSCM,andthoseobtainedbyThermo-Calccalculationswerealsodiscussed.ItisfoundthatthemeltingpointsmeasuredbyDSCandLSCMarerelativelysimilar,whereastheonsetandendofthemeltingtemperaturescalculatedbyThermo-CalcsoftwarearehigherthanthosemeasuredbyDSCandobservedbyLSCM.

简介：Opticalmicroscope（OM）,scanningelectronmicroscope（SEM）,energydispersivespectrometer（EDS）andX-rayDiffraction（XRD）wereusedtostudytheeffectsofrareearthonthemicrostructuralcharacteristicsof55%Al-Zn-1.6%Sihot-dipcoatingsonsteel.TheresultsofOM,SEMandEDSshowedthatbyaddingREintothe55%Al-Zn-1.6%Sibath,thesaw-toothedshapeofintermetallicreactionlayerofcoatingbecamesmooth,andthethicknessoftheoverlayandintermetallicreactionlayerdecreased.TheXRDresultsrevealedthattheintermetallicreactionlayerwascomprisedoftwodifferentregions,abrightphaseclosesttothesteelsubstratewithphasesofFe2Al3andadarkphaseclosesttothemetalliccoatingwithphasesofFeAl3/α-Fe-Al-Si.

简介：采用碱熔处理样品，酸化后，移取部分溶液稀释后引入ICP测定ZrO2、TiO2、Fe2O3含量，剩余溶液用强碱分离钛、铁、锰等干扰元素后，EDTA—CuSO4法返滴定Al2O3，终点明显，检测重现性好；

简介：Inthepresentstudy,sampleswereextensivelycollectedthroughoutthestainlesssteelmanufacturingprocess.Thethree-dimensionalmorphologyofinclusionswasrevealedbynon-aqueoussolutionelectrolysis.Thehighconcentrationofaluminuminferrosiliconcausedtheincrementof[Al]sinsteelandAl2O3ininclusions,whichledtothehighermeltingtemperatureofinclusions.ItwasconcludedthattheapplicationoflowAlferrosiliconandcalciumtreatmentcouldpreventtheformationofAl2O3-richinclusions.

简介：从制样方法及分析方法上对硅锰铁合金的分析方法进行了研究,采用定时、定压、定量制样、标准曲线制作等手段,主要对硅锰铁合金中Mn、Si、P等常规元素进行测定。对于X荧光光谱压片做了充分的前期准备工作,并对相关影响因素进行分析。该方法分析数据准确可靠,进而取得满意的分析结果。

简介：ThegrainrefiningmechanismofC-Mnsteelsheetoncompactstripproduction(CSP)linewasinvestigatedinthisstudy.Thegrainwasabout100μmafterF1passanddecreasedallthewayoftherollingprocess(F2-F6)to15μm.Repeatedphasetransformationexperimentwasconductedtothesteelforgrainrefinement.Thephasetransformationat860℃and920℃canrefinethegrainsizeto7.5μm.

简介：转炉冶炼的高效化与生产过程的清洁化已成为现代炼钢技术发展的核心任务,中厚板卷厂通过比较几种化渣剂的化渣机理,研究无氟复合造渣剂的使用方法。实现了转炉生产全程化渣、降低了钢铁料消耗、消除了氟离子污染,取得了明显的经济效益。

简介：钢筋结构的腐蚀问题一直是困扰业界的难题,特别在严重腐蚀环境下的特殊重大工程中,一般会要求采用不锈钢钢筋,而其成本就会急剧上升。为降低工程成本,各种耐腐蚀复合钢筋的研发就成为必然,且其耐腐蚀性能和性价比方面的优势,因此具有很大的应用前景。目前研究应用比较好的不锈钢-碳钢复合钢筋生产工艺主要有五种:a.喷射沉积+轧制复合;b.中间层液相扩散复合;c.拉拔+旋转减径机轧制复合;d.废铁屑、不锈钢的压缩结合+轧制复合;e.焊接+