简介：ElectrodeENiFe-Cland￡"4303wereselectedtojointhecementedcarbideWC-2QCoandcarbonsteel45byshieldedmetalarcweldingprocess.Microstructureandbendingpropertyofthecorrespondingjointswereanalyzed.Theresultsshowedthatthecarbonsteelelectrode￡"4303hadnopropermetallurgyconditionforthearcweldingofcementedcarbideandcarbonsteel.TheCandNicontentofthecastironelectrodeENiFe-Clcouldmeettheconditionofpreventingtheformationof7]carbide,whichwassuittothearcweldingofcementedcarbideandcarbonsteel,buttheoperationparametersneededtobeoptimizedtominimizetheslaginclusion.ThealloyWC-2QCowhichdidnotfitforcoldarcwelding,byadoptingthemeasureofbeingpreheatedat723K/or1hbeforewelding,andbeingkeptat723Kfor3hafterweldingthenfollowedfurnacecoolingcouldavoidthehappeningofcrackintheWC-20C〇basemetal.

简介：铁路青蛙钢的微结构进化在不同压力下面团结了用OM，FEGSEM，和TEM被学习。钢的碳化物的团结，谷物尺寸，和形态学上的压力的影响被分析。有在高压力下面的压力和团结的微观结构的钢增加的融化的点不与融化的温度显著地变化，这被发现。试验性的结果分别地证明由完全的equiaxed树突组成的团结的微观结构显著地通过压力的增加被精制，与在3，6，和10GPa下面的大约24，18，和8m的吝啬的树突手臂间距。它被precipitates从像针、菱形的碳化物改变的TEM观察也揭示(M3C)在正常期间形成(大气)压力团结进nodulized六角形猛抛M7在3GPa的C3，和M23在6GPa和10GPa的C6，它与踪迹元素的undercooling和分发被联系。precipitates的直径在80nm和200nm之间。

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简介：为掌握一套成熟有效的豪华邮轮开发设计流程和方法,准确、高效地完成船舶结构设计工作,保证豪华邮轮的安全性和舒适性,从结构三维一体化设计总体思路、结构建模和数据输出及几何模型转换有限元模型等3个方面介绍上海船舶研究设计院运用NAPASTEEL开发设计7万总吨豪华邮轮的实践经验。将该设计与传统设计相对比,分析结构三维一体化设计的效率优势。同时,针对现阶段存在的不足和未来的发展方向提出相应的改进建议。

简介：再循环的充满水泥的方形的钢的地震表演上的试验性的研究试管(RCFST)列被执行。六个标本在经常的轴的压缩并且周期的侧面的装载下面被设计并且测试。二个参数，再循环的粗糙的总数(RCA)的代替百分比和轴的压缩铺平，在测试被考虑。基于试验性的数据，hysteretic环，骨骼曲线，韧性，精力驱散能力和RCFST列的僵硬降级被分析。测试结果显示RCFST列的失败模式是在列，和hysteretic环的底部钢试管弄弯的本地人是完整的，他们的形状类似于正常CFST列。而且，所有标本的韧性系数接近3.0，并且相应于最终的侧面的负担的相等的粘滞的抑制系数从0.323～0.360，它证明RCFST列展出显著地震性能。

简介：一个过程被建议输入和hysteretic精力系列由此开发了钢时刻抵抗因为single-degree-of-freedom(SDOF)系统被用于multi-degree-of-freedom(MDOF)，装裱。建议过程用四个框架被验证，viz，有三的框架--，五--，seven-stories,并且其各个受到差错正常和三实际地震的差错平行部件九故事。为三故事、五故事的框架的很好的估计，和相当可接受的估计为七--，并且九故事的框架，被获得了。为在框架高度上散布hysteretic精力的一个方法也被建议。这个分发计划允许一个建议基于精力的地震图案(EBSD)的精力需求部件的决心为每个故事的过程。探讨EBSD的能力部件，一个故事明智的优化设计过程被利用为这些时刻框架从塑料绞链形成/旋转驱散能力的精力开发。建议EBSD过程在一个三故事的一个海湾钢时刻框架的设计被表明。

简介：Anewtypeofhybridweldingmethodcalledresistanceplugwelding(RPW)wasfirstlyadoptedtoachievetheconnectingofdissimilarsteel,mainlyasforthepoorweldingcharacteristicsofhighstrengthsteelproducedbyincreasingcarbon,manganese,silicon,etc.MicrostructuresandmechanicalpropertiesofRPWjointwereanalyzedbyopticalmicroscope,micro-hardnesstestandsheartensilemeasurement.ExperimentalresultsindicatethattheRPWjointhasaroundedrectanglenugget,andthesizeislargerthanellipticalnuggetofresistancespotwelding(RSW)joint;thehardnessvalueofRPWjointisevenlydistributed,accordinglythereisnohardbrittlephases;thesheartensilestrengthofRPWjointincreasesby20%incomparisonwithRSWjointunderthesameweldingconditions.

简介：Inthispaper,theperformancecharacteristicsofASTMA19QS31803andASTMA1S2F51duplexstainlesssteelwereintroduced,andtheweldabilitieswereanalyzed.Theweldingrepairproceduresofthickwallduplexstainlesssteelweredevelopedbyweldingprocedurequalification.Researchshowsthattherepairweldinghaslesseffectonmechanicalpropertiesofweldedjointsandgreatinfluenceonphaseproportionsandpittingcorrosionresistance.Thetestresultsmeettherequirementsofprojectspecifications.Therepairweldingprocedurecanbeusedinproject,andonlyonetimerepairshallbeused.

简介：氢导致了裂开(HIC)有三不同微观结构，小粒的bainite与板条bainite的高力量管道钢的行为(GB?+?磅)，小粒的bainite与针状的铁酸盐(GB?+?AF)，并且伪多角形的铁酸盐(QF)，被基于标准NACETM0284使用腐蚀实验学习。HIC实验在氢硫化物被进行(H2S)浸透的答案。试验性的结果证明有GB的钢?+?AF和QF微观结构介绍优秀腐蚀抵抗给HIC，而在磅的bainite板条和马氏体/奥氏体的阶段?+?GB微观结构为差的腐蚀抵抗负责。与铁酸盐阶段相比，bainite微观结构展出更高的力量和HIC的裂缝危险性。AF?+?GB微观结构被相信在设计的钢之中有机械性质和电阻的最好的联合到HIC。

简介：Inthisstudy,aroll-bondedUNSN088225alloycladpipelinesteelwasinvestigatedanddevelopedinBaosteel.Basedontherequirementsofanumberofpotentialprojects,weperformedaseriesofstrictevaluationsincludingmechanicalandcorrosiontests.Theresultsshowthemechanicalpropertiesandcorrosionresistanceofthiscladsteeltobeexcellentandtomeettherequirementsofallthedesignparameters.

简介：Theout-of-planedeformationisaseriousprobleminthin-plateweldedjoint,anditisdifficulttoreduceorcontrolthedistortionduringweldingprocess.Externalrestraintisregardedasaneffectivemethodtomitigatethedistortion,anditiswidelyusedintheactualmanufacturingprocess.Inordertoinvestigatetheinfluenceofexternalrestraintonweldingdeformationinthinplatejoints,athermo-elastic-plasticfiniteelementmethodbasedonABAQUSsoftwarewasdevelopedtocalculatewelding-induceddeformation.Meanwhile,weldingdeformationinthethin-platejointswasmeasuredbyexperiments.Throughcomparingthenumericalresultswiththemeasureddata,theeffectivenessofthedevelopedcomputationalapproachwasverified.Basedonthesimulatedandexperimentalresults,thegenerationmechanismoftheout-of-planedeformationinthinplatebead-onjointwasdiscussed,andtheinfluenceofexternalrestraintonthefinalweldingdeformationwasclarified.

简介：当演员组Mn18Cr18N奥氏体的不锈钢的热变丑行为在950-1200的温度范围被学习??吠???嘴????????????????????????眱吗？？

简介：TheHAZmicrostructureandperformanceofQuenchingandTemperingmodetemperbeadweldingandgeneralweldedjointswhichweremadeonSA508-3steelof60mmthicknesswerecomparedinthisarticle.Theresultshowsthattemperingsorbitewhichhasexcellentoverallperformancewasobtainedinbothmodes.ThemicrostructureofQuenchingandTemperingmodeweldedjointsgotmorefinegrain.Eventhoughthehardnessoftemperingbeadweldedjointsishigherthanthegeneralone,itstillmeetsthestandardswhichislowerthan350HV.TheimpactabsorbingenergyofeachdistrictoftemperingbeadweldedjointsHAZreached170J,whichisequaltogeneralone.

简介：ThediffusionbondingofAZ3\BMgalloyandQ235steelwasinvestigatedwithaZn-5AIalloyasinterlayerandunderdifferentholdingtimerangingfrom3to1200s.Themicrostructureandphasecompositionsofbondedjointswerecharacterizedbyscanningelectronmicroscopy(SEM),energydispersivespectrometer(EDS)andX-raydiffraction(XRD)methods.TheshearstrengthofMgalloy/steeljointswasmeasuredbytensiletester.Itwasfoundthatthemicrostructureofbondedjointsevolveddramaticallyalongwiththeprolongationofholdingtime.Undertheholdingtimeof3s,themainpartofjointwascomposedofMgZn2phaseanddispersedAl-richsolidsolutionparticles.Whenincreasedtheholdingtimemorethan60s,theexcessivesolutionofAZ3\Bintotheinterfacialreactionarealedtotheformationofcoarsephaseandeutecticmicrostructure,andalsothecomplexFe-AlandMg-Al-ZnIMCsattransitionlayerclosedtoQ235steelside.Accordingtothetensiletestingcharacterizations,thejointsobtainedunderholdingtimeof3sexhibitedthebestshearstrengthof84MPa,andthefractureoccurredattheintermediarypartofjointwheretheflexibleAl-richsolidsolutionparticlescouldhelptoimpedethemicrocrackpropagations.Withprolongingtheholdingtimeto600s,theshearstrengthofjointswasdeterioratedenormouslyandthefracturepositionwasshiftedtothetransitionlayerpartclosedtoQ235steel.

简介：Thehighstrengthlow-alloysteelsareweldedbyunderwaterwetweldingwithstainlesssteelelectrodes.Themicrostructuralandelectrochemicalcorrosionstudyofbasemetal(BM),weldzone(WZ)andheataffectedzone(HAZ)arecarriedouttounderstandtheinfluenceofthecorrosionproductlayergeneratedonthehighstrengthlow-alloysteelsweldedbyunderwaterwetweldingwithstainlesssteelelectrodes,methodsusedincluding,potentiodynamicpolarization,electrochemicalimpedancespectroscopy(EIS)andscanningelectronmicroscope(SEM).TheresultsindicatethattheWZactsasacathodeandthereisnocorrosionproductonitthroughouttheimmersionperiodinseawater.TheHAZandBMactsasanodes.ThecorrosionratesoftheHAZandBMchangewiththeimmersiontimeincreasing.Intheinitialimmersionperiod,theHAZhasthehighestcorrosionratebecauseithasacoarsetemperedmartensitestructureandtheBMexhibitesamicrostructurewithveryfinegrainsofferriteandpearlite.Afteraperiodofimmersion,theBMhasthehighestcorrosionrate.ThereasonisthatthecorrosionproductlayerontheHAZisdenseandhasabetterprotectivepropertywhilethatontheBMislooseandcannotinhibitthediffusionofoxygen.

简介：在这研究，充分的理由运动记录(SGMR)选择基于希腊语字母的第七字()作为一光谱形状指示物是适用于钢braced框架结构被调查了。为目标Epsilon的定义的概率的地震危险崩溃分析()并且目标希腊语字母的第七字()在不同危险层次的价值被介绍，适当地考虑选择了SGMR。脆弱曲线为相应于在计划有重要不规则的典型的钢braced框架的三个代表性的模型的不同限制状态被开发，借助于一个加权的损坏索引。结果显示出那光谱形状指示物在预言的中部的结构的能力上有重要效果，并且另外参数比与适当价值寻找记录是损坏的一个更柔韧的预言者。