简介：The1990ChineseConferenceonMartensiticTransformation(CCOMAT)hasbeensuccessfullyheldinQinhuangdao,abeautifulseasidecityinChina,onAugust18-22,1990.TheconferencewasorganizedbyHebeiInstituteofTechnologyandHebeiBranchoftheChineseSocietyofMetals.

简介：Onthebasisoftransformationkineticsandthermodynamics,theaustenite-ferritetransformationstarttemperatureduringdeformationwaspredictedforseveralgradesoflow-carbonsteelsunderdifferentprocessingconditions.ResultsindicatethatAr3dtemperaturemostlydependedonalloyingcompositionandprocessingparameters.Ar3dincreasedasstrainrateorstrainincreasedforthesamesteelgrade.Inviewofenhancementofdeformationontransformation,thebasickineticsmodelwasestablishedtosimulatedeformationinducedtransformationbehavior,usingwhichtheinfluenceofthedeformationstoredenergyandeffectivedeformationledgeonthenucleationandgrowthcanbeconsidered.Thesimulatedresultsareingoodagreementwithexperimentresults.

简介：硼(B)的增加经常被采用增加bainitic钢的hardenability。尽管它是众所周知的，那B能延迟bainitic转变动力学，B怎么在ausforming以后影响bainitic转变动力学，仍然不是清楚的。由系统的高分辨率的dilatometry测试，现在的工作表明bainitic转变动力学包括孵化时间，转变速度和转变体积部分从所有方面在ausforming以后与B增加在低C钢被加速。为没有B增加的一样的钢，相反，转变速度和转变体积部分在ausforming以后被延迟。当某硼能与脱臼交往因此提高bainite成核率，ausforming能在优先的奥氏体谷物边界减少B分离，这被建议当某硼能与脱臼交往。而且，auforming能精制bainitic捆的平均体积。基于在成核率和bainitic捆的精炼的增加之间的竞争机制，bainitic转变动力学上的B和ausforming的效果被讨论。

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简介：Themicrostructuralfeatures,shapememorybehaviorandmechanicalpropertiesofNi-Mnbasedalloyswereinvestigatedbydierentialscanningcalorimetry(DSC),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM)andthermalcyclingtestundervariousstresses.ThetransformationtemperaturesshiftedtowardlowertemperatureswhenaddingathirdelementintotheNi-Mnsystem.Theadditionof10at.pctFeincreasedconsiderablythemechanicalpropertiesexhibitingstillhightransformationtemperatures.However,itwasfoundthatinNiMn40Fe10alloythemartensitictransformationisnotthermoelasticinnature.ThemechanismofthistransformationandthecrystallographyofNi-Mn(50-x)-Fex(x=5,7,10,20at.pct)alloysarepresented.

简介：Basedontheclassicdiffusioncontrollednucleationandgrowththeory,thesympatheticnucleationledgewisegrowthmechanismofbainitewasstudiedtheoreticallyforIowcarbonFe-Calloys.Therationalityoftheoccurrenceofsympatheticnucleationontheterracesofledgescompetingwithlateralledgegrowthandothersitesnucleationwasdemonstratedbythepresentworkquantitatively.ThecalculationsindicatedthatIowreactiontemperaturesandhighcarbonconcentrationsmayfavorthesympatheticnucleation,thusaccountingfortheformationofmultilayerstructuresofbainite.

简介：由微观结构和机械性质上的艾尔的Si的部分或完整的替换的效果是广泛地与多角形的铁酸盐矩阵在多相的导致转变的粘性(旅行)学习了钢，但是很少在bainitic旅行钢学习了。当为第三代的进程参数的一个函数预付高力量钢(AHSS)，现在的学习的目的是适当地在bainitic钢在bainite转变，微观结构和机械性质上调查艾尔和Si的效果以便为alloying设计提供指南。而Si增加在bainite转变动力学导致延迟，它从dilatometry学习，微结构调查和艾尔增加导致加速的张力的性质大小被显示出。艾尔的增加延迟进在使温度保持比450高的珠泽铁和碳化物的奥氏体的分解?敲牣獹慴汬穩瑡潩?湡敮污湩?慷?灡汰敩?潴愠???┶楓猠整汥琠?浩牰癯?桴?慭湧瑥捩瀠潲数瑲敩?吠敨椠灭捡?景愠?慣瑳猠牴灩瀠敲愭湮慥楬杮漠?桴?業牣獯牴'壮肭?整瑸牵?瀠敲楣楰慴楴湯愠摮洠条敮楴?牰灯牥楴獥眠牥?湩敶瑳杩瑡摥戠?汥'虪箿珵u潲敢洠捩潲愭慮祬楳?琠慲獮業獳潩?汥'虪箿珱＾驿麙盏?愠摮堠爭祡搠晩牦捡楴湯愠慮祬楳?攠'?瑉眠獡映畯摮琠慨?桴?牰'虨宫摤嫕?景猠'虦?桰獡?慰瑲捩敬?...

简介：连续冷却的用法在数字焊接的转变(CCT)图模拟现状。不过，说明在分别地导致不同CCT行为和CCT图的材料的化学作文提供限制。因此，在发展中的剩余压力上在CCT图分析变化的影响是必要的。在现在的纸，在剩余压力的数字计算以后的四张CCT图和他们的效果为煤气的金属弧焊(GMAW)焊接的广泛地使用的结构的钢S355J2+N被调查过程。而非执行CCT行为的任意的调整，四个有理由的数据集合被用作输入到数字计算：在Sysweld数据库，通过Gleebledilatometry测试获得的试验性的数据，和TTT/CCT预言可得到的数据从JMatPro和爱迪生焊接研究所(EWI)计算了虚拟加入门软件。执行数字分析就不同CCT图而言在剩余压力导致了显著偏差。而且，改进失真和剩余的预言的可能性基于CCT强调行为被讨论。

简介：Microstructureandsubsequentphasetransformationsonheatingofthemelt-spunNd85Al15alloyhavebeenstudiedbyX-raydiffraction,transmissionelectronmicroscopyanddifferentialscanningcalorimetry.Themelt-spunNd85Al15alloyshowstwo-stagetransformationprocessesasfollows:amorphous+72nmsupersaturatedbcc-Nd(Al)solidsolution→7nmomega-likephase→AlNd3+hexagonalNd.Theactivationenergiesforthefirstandsecondtransformationwerefoundtobe100kJ/moland188kJ/mol,respectively.Theformationmechanismofnanoscaleomega-likephaseisdiscussed.

简介：有双阶段的结构(alpha+beta)的alpha钛和它的合金在大约10~的紧张率下面动态地被使变形4s~(-1)。形成和微结构进化局部性砍乐队们被扫描电子显微镜学(SEM)和传播电子显微镜学(TEM)描绘。结果表明紧张和紧张率应该同时被看作机械条件为砍乐队形成，和twinning是变丑的一个重要模式。试验性并且在乐队以内的材料经历了的计算表演超高频率的紧张率(9X10~5s~(-1))变丑，它是平均紧张率的二大小要求了为砍乐队形成；在乐队的脱臼能被压缩并且发展成房间结构；到在乐队以内的alpha_2的阶段转变fromalpha被观察，并且转变产品(alpha_2)与他们的父母一起有某个结晶的取向关系；有在在乐队以内观察的直径的10亩m的一种平均尺寸的equiaxed谷物被建议是再结晶的结果。

简介：Theeffectofthermalcyclingunderloadingonmartensitictransformationandtwo-wayshapememoryeffectwasinvestigatedforTi-49.8at.pctNialloy.ItisshownthatMsandMftemperatureincreasewithincreasingthenumberofcycles,whileAsandAftemperaturedecreaseduringthermalcycling.Thetotalstrainεtandpermanentstrainεpincreasewithincreasingappliedstressandnumberofcycles.Thetwo-wayshapememoryeffectcanbeimprovedbyproperthermalcyclingtrainingunderloading,whileexcessivelyhighappliedstressresultsinthedeteriorationofTWSME.Thereasonforthechangesinmartensitictransformationcharacteristicsandtwo-wayshapememoryeffectduringthermalcyclingunderloadingisdiscussedbasedontheanalysisofmicrostructurebyTEMobservations.

简介：Themartensitic/ferriticsteelshavebeenusedasboilerandturbinematerialsinpowerplants,andalsobeenselectedaspotentialmaterialsforstructuralmaterialsinnuclearreactors.Inthispaper,thekineticanalysisofthemartensiteformationandmicrostructuralcontrolofhigh-Crmartensitic/ferriticsteelsarereviewed.Amodularapproach,incorporatingFisherpartitioningnucleationandanisotropicgrowthforimpingement,wasproposedtodescribethemartensiteformationkineticsunderdifferentcoolingrates.Thekineticanalysissuggestedathermal-activatedgrowthfeatureoccurringduringthemartensitictransformationofmartensiticsteels.Themicrostructurecanbetunedbycompositionoptimizationandvariouscombinationsofheattreatmentparameters(temperature,time,severeandminordeformation).Fortheapplicationinpowerplant,thepotentialofboundary-design,refinementoforiginalaustenitegrainsizeandthefinalmartensiticlath,pinningeffectofstablecarbides,inimprovingtheperformancesofmartensitic/ferriticsteelsatelevatedtemperaturesshouldbeinvestigatedmorethoroughly.Furthermore,effortsshouldbemadetoexploretheeffectsofretainedausteniteontheimprovementofhigh-temperaturecreepstrength.Fortheapplicationofnuclearplants,attemptsshouldalsobemadetoproduceFepowderswithuniformlydistributedoxideparticlesbychemicalreactions.

简介：TheeffectoftitaniumadditiononthemicrostructureandmechanicalpropertiesofbrassCu40Znhasbeenstudiedviathepowdermetallurgy(P/M)route.Thewater-atomizedCu40Zn—1.0wt%Tialloypowderwasconsolidatedatdifferenttemperaturesintherangeof400—600℃usingsparkplasmasintering(SPS)andhotextrusionsubsequently.Resultsshowthatthesuper-saturatedsolidsolutiontitaniumelementinrapidlycooledbrassCu40Znpowdercreatedhighchemicalpotentialforaprecipitatereaction,showingsignificantgrainrefinementeffectsontheconsolidatedCu40Znmatrix.Consequently,excellentmechanicalpropertieswereobtainedbyprecipitationhardeningandworkhardeningaftersinteringandextrusion,withyieldstrengthof390MPa,ultimatetensilestrengthof617MPa,andVickersmicro-hardnessof192HV,whichare28.7%,23.4%,and23.9%highervaluesthanthoseofextrudedCu40Znbrass,respectively.