简介：Influenceofthermo-mechanicalcontrolledprocessing(TMCP),includingtwo-stagerollingwithlaminarcooling,aircoolingandultra-fastcooling,onthemicrostructureandmechanicalpropertiesofthreekindsofNb-microalloeyedsteelswasinvestigatedbyhot-rollingexperiment.Effectofchemistrycompositionsandmicrostructureonmechanicalpropertiesandtherelationshipbetweenthemultiphasemicrostructure’sformationwithTMCPwereanalyzed.Theresultsshowedthatthemixedmicrostructurecontainingferrite,bainite,martensiteandasmallamountofretainedaustenitecanbeobtainedbythermo-mechanicalcontrolledprocessing.Size,quantityanddistributionoftheconstituents(ferritegrain,bainitepacketandM-Aislands)significantlyaffectthemechanicalpropertiesofthreekindsofNb-microalloyedsteels.UndertheconditionofsimilarTMCPparameters,thereisagraduallydecreasingtendencyintensilestrengthfromhighsiliconNbsteel,highsiliconNb-TisteeltolowsiliconNb-Tisteel,andanoppositetendencyintotalelongationandproductoftensilestrengthandductility.Totalelongationandproductoftensilestrengthandductilityreachthemaximumvalues(41%and25256MPa%respectively)forlowsiliconNb-Tisteel.

简介：ThehotrollingexperimentinvestigatesintotherelationshipbetweenthemicrostructuresandthemechanicalpropertiesofNb-TimicroalloyedsteelswithvariousTicontents.TheresultsindicatethattheeffectofthebainitefractionofNb-TimicroalloyedsteelsontheyieldstrengthofthesteelsisnotrelatedtoTicontent,whiletheslopeoftheHall-PetchrelationshipdecreaseswiththeincreaseofTicontent.Accordingly,theMisramodelfortheyieldstrengthofNb-Timicroalloyedsteelsismodified,andthefactorswhichcausethechangeintheslopeofHall-Petchrelationshiparediscussed.

简介：InfluenceofdifferentcoolingratesonthemicrostructureandtheprecipitationbehaviorofNb-TimicroalloyedsteelwasinvestigatedbyCSLM,OM,SEMandEDS.Theresultsshowthattheprecipitationprocessofcarbonitridescanbein-situobservedbyCSLM,andwiththeincreaseofthecoolingrate,thedistributionofprecipitateschangesfromalongtheausteniticgrainboundariestowithinthegrains.Withtheincreaseofthecoolingrate,theproeutectoidferriticfilmbecomessmallerandsmallerandthendisappears,andtheoriginalausteniticgrainsbecomefinerandfiner.Inordertoobtainnon-filmlikeproeutectoidferritesornon-chainlikeprecipitatesalongtheausteniticgrainboundariesandfinerausteniticgrains,thecoolingrateshouldbeatleast5℃/s.

简介：Abstract:Theeffectofstabilizingelements,suchasNbandTi,onthemicrostmctureandpropertiesoflowcarbonferriticstainlesssteel(FSS)hasbeeninvestigated.TheresultsoftheThermo-calcsimulationhaveshownthattheinterstitialelements,suchasCandN,maybecompletelystabilizedbytheadditionofNbandTi.WiththeincreaseofNbandTicontents,thea+γtwophasesgraduallytransfertoasingleα-phaseunderahightemperaturecondition,andthecontentofthecarbideM_(23)C_6graduallydecreases.ThemicrostructurehasindicatedthatthecombinedadditionofNbandTicanpromotetherecrystallizationofthebandstructureandformmoreuniformequiaxedgrains.Also,withtheincreaseofNbandTicontents,theelongation,ther-valueandthecorrosionresistanceofcold-rolledandannealedsheetsareimprovedprominently.IncomparisonwiththeeffectofTi,theadditionofNbismorebeneficialtotheincreaseofr-valueandthecorrosionresistance.

简介：本文论述了Nb、V、Ti在钢中的存在形态，分析提高钢的强韧性、改善可焊性的微观机理及在钢中的重要作用。

简介：TheinfluenceofTiandNbonthemicrostructure,mechanicalproperties,andsecond-phaseprecipitationof430ferriticstainlesssteelwasinvestigated.Inadditiontoopticalmicroscopy,transmissionelectronmicroscopyandX-raydiffractionanalyses,tensiletests,andcarbonitrideextractionexperimentswereconductedtoinvestigatethemicroscopicmechanisms.TheresultsshowedthattheprimaryprecipitatesinSUS430ferriticstainlesssteelwereCr23C6,Mn23C6,andCr7C3,andtheprimarystrengtheningmechanismwasprecipitationstrengthening.WhenTiwasaddedseparately,themainprecipitateswereTiCandTiN.However,coarseTiCadverselyaffectedthemechanicalpropertiesofsteel.Whendouble-stabilizedwithTiandNb,coarseTiCwasreplacedbyfineNbC.Thetypeofprecipitationwasaltered,andprecipitationandsolidsolutionstrengtheningoccurred.Therefore,thetensilestrengthandplasticstrainratio（r-value）improvedto433.60MPaand1.37,respectively.

简介：Abstract:TheeffectofTiandNbontherecrystallizationandtherecrystallizedgrainsizeofthehot-rolledplatesandcold-rolledsheetsofultralowcarbonandnitrogen(ULCN)Cr18ferriticstainlesssteel(FSS)isinvestigated.Theresultsshowthattherecrystallizationofhot-rolledplatesandcold-rolledsheetswith0.29%Nbisdelayed,andtherecrystallizedgrainsaresignificantlyrefined.

简介：试验研究不同加热温度及加热时间与高Nb管线钢X65力学性能的关系。结果表明,加热温度从1130℃至1190℃变化时,随加热温度的升高,屈服强度与抗拉强度先减小后增加,且在1150℃左右时达最小值;随着加热时间的延长,屈服强度和抗拉强度均增加;而低温DWTT性能无明显变化。由此,对该品种管线钢加热制度的选择进行了探讨。

简介：通过两组不同的试样，分析含铌16MnR钢板中Nb(N，C)的析出行为对钢板性能的影响，并提出了解决途径。

简介：以EM223-16/16-DC.RLY模块元件级的维修实例,阐述了此模块的工作机制,并且通过抄板,将完整的电路图绘制下来,以便各位同行相互学习和交流。

简介：LOGO！可编程逻辑控制模块功能强、易于操作，在实际应用领域中具有很高的性能价格比，焦白车间电气改造使用LOGO！后，延长了主接触器及电机的使用寿命，促进了生产的发展。

简介：Delphi是Inprise公司（即原Bodand）推出的基于真正面向对象语言ObjectPascal语言的可视化编程工具，是当今世界上最快的编译器。能大大提高编程效率。查询模块是数据库管理系统中不可缺少的部分，在Delphi中进行数据库记录查询操作，根据打开数据库的方式来确定。大概有六种常用查询方法：普通查询、模糊查询、多条件查询、联合查询、不重复查询、SQL查询。在实践编程过程中应用比较多，为了减少代码的调试时间和提高编程效率，本文对这几种方法作简单介绍并举例列出编程的标准格式。

简介：因高炉炉身传统冷却壁结构存在缺陷．为此．国外科技人员研究了新的技术方案。新方案的实质在于高炉炉身整个冷却区由大型模块制成，大型模块是炉壳的一部分，将厚壁钢管弯成弓形管焊接安装在炉壳上，并在弓形管之间填充耐热混凝土。这些高炉采用大型冷却模块的经验表明，由于炉身外壳的气密性和冷却效果提高(1～1．5倍)．

简介：根据炼铁新厂煤气放散塔自控系统的运行情况，从RockWell工控软件RsLinx入手，分析了RsLinx软件的通讯方式，提出了采用动态数据交换技术的通讯方案。并用Delphi编制程序，实现了数据远传和显示，声音报警等功能，保证了煤气系统安全运行。同时也为数据存储，不同工控系统数据交换提供了一种方法。

简介：本文对电炉炼钢厂连铸工程自动化系统级别及其所使用的网络进行了简要介绍，网络中使用了以太网、Profibus—DP网，将自动化系统中不同级别集成为一个高效、统一的整体。

简介：1引言在我国,随着改革开放和经济发展步伐的加快,尤其是社会主义市场经济体制的建立,企业相互间竟争愈演愈烈,这就促使各行各业对信息的需求量日益增大,加强信息管理和利用被摆上了一个极其重要的位置,企