简介:对C12-35/10型发电组出力提高15MW可行性进行了技术分析并提出了相关的改造方案.
简介:Steelhasbeenusedasatraditionalwheelmaterialsforalongtime.Before1980’s,over90%wheelsweremadeofsteels.Then,theyieldstrengthofwheelsteelsincreasedgraduallyfrom240-350MPato600MPaorhigher.Theadvancedhighstrengthsteelsbecomethemainwheelmaterials.Since1990’s,DP600hasbeenbroadlyappliedinsteelwheelsoversea.However,therewaslittleresearchofapplicationofhighstrengthsteelwheels(especiallywheeldisc)indomesticwheelindustrial.Inpresence,DP600steelwheelisonlydevelopedinFAWSHbyusingimportedCKD.OtherdomesticsteelwheelmanufacturersdidlittleworkonhighstrengthDP600wheeldiscs.BaosteelwheelsCo.Ltd.isthefirstdomesticcompanyproducingDP600steeldiscsandhasbecometheleadingcompanyinproductionofhighstrengthwheel.BecauseofthehighstrengthofDP600,itsformability,springback,andwrinklehavebecomethekeysofthesuccessfulapplicationofDP600steel.Inthispaper,themetallurgicalandmechanicalpropertiesarefirstlyintroducedandformationproblemsofDP600aredescribedcomparedtotraditionalsteels.Secondly,FLDanalysishasbeendone.Wrinkleandmorespringbackarerecognized.Tosolvetheseproblems,anoptimizedsolutionisdesignedandthegoodresultisobtained.ThetesthasshownthatthefatiguepropertyofsteelwheeldiscsmadebyDP600havebeengreatlyimproved.
简介:采用混合元素粉末法,通过冷等静压成形和真空烧结,制备Ti600合金(名义成分为Ti-6Al-2.8Sn-4Zr-0.5Mo-0.4Si-0.1Y),研究烧结温度对合金显微组织以及密度与力学性能的影响。结果表明,烧结温度为1100℃时,合金组织为杂乱无章的α层片组织,而在1200℃下烧结时α层片组织开始规则排列,形成α丛束,当烧结温度达到1300℃时,α层片组织基本都形成α丛束。在合金组织中Zr元素和Mo元素固溶于β-Ti相,Al元素固溶于α-Ti相,Si元素富集于析出物,Sn、Y元素分布均匀。随烧结温度升高,合金中孔隙和α-Ti相数量逐渐减少,β-Ti相数量逐渐增加,合金的致密度提高,力学性能明显提升,1300℃温度下烧结的合金致密度为92.8%,硬度(HV)为324.0,抗拉强度和伸长率分别为622.6MPa和5.0%。