简介：Inthispaper,aslowbendingspeedvarestrainttestmethodwithcon-tinuouslyadjustabledeformationratefortestinghotcrackingsensitivityisde-velopedanditsworkingprincipleisdescribed.Fromgreatamountsoftests,itisknownthatstrainrateaffectsthesensitivityofsolidificationcrackbecauseofitsinflunceonmaterialductilityinBTRdirectly.Thesmallerthestrainrate,thebettertheductilityandthelowerthesolidificationcracksensitivity.Theex-tentofthiseffectvarieswithdifferentmaterials,forLF-6aluminumalloy,itisgreat,butfor16Mn,19Mn5and20Gsteels,itissmall.Throughsystematicinvestigation,itisconcludedthatstrainrateofametalduringweldingcanbeloweredandtheresistancetosolidificationcrackcanbeenhancedbyreducingstructrualrestraintandbyadjustmentofweldingparameters.

简介：Titaniumandtitaniumalloyshaveseveraladvantages,butthecostoftitaniumalloysisveryexpensivecomparedwiththetraditionalmetalmaterials.Thisarticleintroducestwonewlow-costtitaniumalloysTi-2.1Cr-1.3Fe(TCFalloy)andTi-3Al-2.1Cr-1.3Fe(TACFalloy).Inthisstudy,weusedCr-Femasteralloyasoneoftherawmaterialstodevelopthetwonewalloys.Weintroducethemicrostructureandtensilepropertiesofthetwonewalloysfromβsolutiontreatedwithdifferentcoolingmethods.Optica...

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简介：试验性的工作被承担用一个双轴的泥浆制造者在AZ91D合金的团结微观结构上调查旋转速度的效果。然后数字的模拟被用来在提起的流动和melt的温度地上调查旋转速度的效果。增加旋转速度能产生实质的谷物精炼，这被发现，它能被归因于极其一致的温度和潜力在散混合下面在体积液体成核代理人聚类的分散的任何东西引起的有效成核率的增加。

简介：TheanalysisofthemicrostructuralcharacterizationandphasecompositionofelectronbeamweldedjointzonesofTi-43Al-9V-0.3Yalloyhasbeendoneinthisstudy.TheweldedseamismainlycomposedofB2phase,thepartialγ+α2two-phaselamellarstructureandgranularγmphase.AndthelanthanonYexistedasYAl2phaseandservedasgrainrefined.Theimpactofdifferentcoolingratesonjointmicrostructure,fracturecharacteristicandtensilestrengthwereinvestigated.Thehighcoolingraterestrainedthestructuraltransformationandresultedintheorderingstructure.Thefractureofthejointwasbrittlecleavagefracturebecausetheorderingstructurewentagainstrestrainingthecrackpropagation.Withthedecreaseofcoolingrate,thetransformationamountsoflamellarstructureincreased,andthefracturepresentedthelayeredandcross-layeredcharacteristic.