微量元素对低膨胀Fe-Ni基高温合金抗氧化性能的影响

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1、维普资讯http://www.cqvip.com第36卷第2期仓属学故Vl0136N022000年2胃ACTAMETALLURG1CASINICAFebruary2000摘要为了保持低的膨胀系数，低膨胀GH909台金中不肯Cr．导致台釜的抗靼让性能较差为了解决过题．在GH9O9台金的基础上调整成分．加入少量Cr和稀土元素Y与La等，并提高Co／(Co+Ni)比例，恒台会在膨胀乐数基丰未变的情况下抗氧化性能得到较明显的改善用X射线衍射、金相显微铙，扫描电镜等拉查r舍叠的氧化屠．发现GH909旨垒氧化层很厚．其主要成分为

2、FenO4．Fe3O2等．氧化层组织较疏松．有由氧化现象加^Cr羊[稗工元素的合金鬟化暑较薄．氧化层主要成分还有Cr2O3等．氧化层组织致密，未见内氧化温度愈高Cr和稀土的育益教果愈啊．已们有效地抑制丁氧的扩散关键词低膨胀，驻=基．塞婆盒金；抗氧化、L中圉法分粪号TG132．11TG113．23文献标识码A文章编号0412·1961(2000)02·0155—04J＼THE0XIDT10N_】RESISTANCEPR0PERTIESoF，rL0W—EXPANS10NSUPERALL0YS／『21j2DENGBo，CH

3、ENGansheng，LONGZhengdong．LINPing，ZHONGZengyongDepartmentofHighTemperatureMaterialsICentralIronandSteelResearchInstitute．Beijing100081Correspondent；DENGBo．seniorengineer，Tel,(010)62182456Fax,．(oio)s~i72725Manuscriptreceived19994)7-26inrevisedform1999—1l17ABSTRAC

4、T1bobtainlOWthermalexpansioncoe毋cientthealloyingelementCrisremovedfromtheallovGH909．whichmadetheoxidationresistancepropertyofGH909verypoorTosolvethisproblem．asillaUamount0falloyingelementCr．andrareearthelementsYandLawereaddedintothealloyGH909andtherateofCo／(Co+

5、Ni)wasjncreased．thesemadetheoxidationresistantpropert)rimproved0b·ously．WhiletheexpansionCOemcientkeepsunchangedobviouslyTheX—diaction，opticalandelectricalmicroscopeWeteusedtoinspectthestructureofoxidationlayerForthealloyGH909thelayerofoxidationisverythickandth

6、emainconstitutionisFeaO4．Fea02andSOon．thestructureofoxidizinglayerislooserandtheinterior—oxidationappeared．ForthealloyaddingsmallamountofCrandrareearthelementsontheGH909．thelayerofoxidationisverythin．themainconstitutionincludesCraO3asidefrONFen04，Fe302．thestruc

7、tureofoxidationlayerisvery'closedandtheinterioroxidationdisappeares．Theelements0fCr．YandLahinderthedifusionofelement0eriectivelyandtheabovebeneficiaIefectincreaseswithincreasingthetemperature．KEYWoRDSlowthermalexpansioncoeficient，FeNibasesuperalloy,oxidationres

8、istance传统的低膨胀GH909合金具有良好的综合力学性能1实验方法但由于缺乏Cr．Al元素，合垒的抗氧化性能受到影响I1，并No1合金为GH909合金其主要成分【质量分数％导致合金缺I=1持久寿命降低．而为了提高抗氧化性能．加入下同)为：CO．006，SiO40i387O．Ti166．Nb488较多的Al，CrMo的台金如Inconel7