Cr3C2对Ti（C,N）基金属陶瓷微观组织和力学性能的影响.pdf

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1、Availableonlineatwww．sciencedirect．corn·一，，·一Transactionsof·：，ScienceDirectNonferrousMetalsSocietyofChinaPressTrans．NonferrousMet．Soc．China22(2012)1096—1105www．tnmsc．caEffectofVC／Cr3C2onmicrostructureandmechanicalpropertiesofTi(C，N)一basedcermetsZHANBin’。

2、，LIUNing’。，JINZhi。bo，LIQi—long，SHIJin．gang1．DepartmentofMaterialsScienceandEngineering，HefeiUniversityofTechnology，Hefei230009，China；2．EngineeringLaboratoryofNonferrousMaterialsandProcessingofAnhuiProvince，Hefei230009，ChinaReceived18April2011；accepted30S

3、eptember2011Abstract：EfiectsofVC／CrC2onthemicrostructureandmechanicalpropertiesofTifC，N1。basedcermetswerestudied．Themicrostructurewasinvestigatedbymeansofoptica1microscopy．X—raydiffractometryaswellasscanningelectronmicroscopyincombinationwitl1energydispe

4、rsivespectrometry．Mechanicalproperties．suchastransverserupturestrength．hardnessandfracturetoughness．weremeasured．Theresultsshowthatthereareblackcore-greyrimstructureandwhitecore-greyrimstructureinthemicrostructure．ThegrainsbecomefineduetotheVC／CrC，andthe

5、grainsofcermetaddedwith0．75VC／0．25CrC，arerefinedmostremarkably．TheblackcorebecomesfinerwiththeincreaseOfVCadditionandrimphasebecomesthickerwiththedecreaseOfCr3C2addition．Theporosityincreaseswiththeincrease0fVCadditioninVC／CrC2．Comparedwiththecermetfreeof

6、VC／CrC，，thetransverserupturestrengthandhardnessofcermetswithVC／Cr3C，arebothimproved．andthemaximumvaluesarebothfoundforthecermetwim0．25VC／0．75Cr3C，．ThefracturetoughnesscanbeeffectivelypromotedbyaddingVC／Cr1C，withanappropriateratioofVCtoCr3C，，andthemaximum

7、valueisfoundforthecermetwith0．5VC／0．5CrC，．Keywords：Ti(C，N)-basedcermet；VC：Cr3C，：microstructure；mechanicalpropertiesgrowthistoaddasmallamountofgraingrowthinhibitor．lIntrOductiOnmetalliccarbide，suchasVC，Cr3C2，NbCorMo2C，intothestartingpowdermixtures[7—11]，a

8、ndtheinhibitingTi(C，N)一basedcermetsconsistmainlyofhardeffectsofVCandCr3C2arethebestofall『12]．carbonitridegrains，whicharecalledashardphase，AlthoughthereisconsanguinitybetweencementedembeddedinatoughbinderphasethatisbasedonN