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ID:32702550
大小:1.94 MB
页数:64页
时间:2019-02-14
《喷射沉积高铝锌合金耐蚀性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要本文以ZA35合金为研究对象,通过添加合金元素Mn来提高合金的耐蚀、耐磨性能。利用快速凝固技术一喷射沉积,与固态挤压相结合的方法制备ZA35合金.设计了正交试验,确定了此种合金的最佳热处理制度;分析了合金的显微组织与断口形貌;测定了合金的力学性能、腐蚀、磨损性能,取得如下实验结果:利用喷射沉积制备的含锰ZA35合金组织均匀细小,初晶相大多呈颗粒状或块状。挤压后合金组织十分致密,第二相弥散均匀的分布在基体上。正交试验结果表明,此种合金在375~385℃保温3.5~4.5h后水淬,120℃时效4.5~6h时,其最大
2、抗拉强度可达到484MPa,布氏硬度在120~130HB之间,伸长率6在5%~7%之间。热处理后合金基体中析出第二相,第二相的弥散强化与合金基体组织的细晶强化共同作用使合金的强度大幅度提高。腐蚀试验结果表明,喷射沉积含锰ZA35合金的耐蚀性优于金属型铸造含锰ZA35合金。合金元素Mn均匀分布于基体之中改变了各相之间的电极电位,从而提高了合金的耐蚀性。喷射沉积含锰ZA35合金基体的强化与摩擦系数的降低,使其耐磨性较金属型铸造含锰ZA35合金有很大提高。关键词:喷射沉积,ZA35合金,显微组织,力学性能,耐蚀性,耐磨性
3、ABSTRACTThisthesismainlystudiestheZA35alloy.Alloyingelements(Mn)isaddedtoimprovecorrosion一,wear-resistanceoftheZA35alloy,whichisproducedbyspraydeposition(SD),akindofrapidsolidification(RS)techniqueandsolidextruding.Theoptimallysystemofheattreatmentisobtainedth
4、roughorthogonalexperiments.MicrostructureandpatternoffractureareobservedbytheopticalmicroscopeandSEM.Theperformanceoftensilestrength,corrosion,wearingaretested.Themainresultsaresummarizedasfollows:ThemicrostructureofZA35—3.5Mnalloyishomogeneousandfine.Themorph
5、ologyof两maryphaseismainly舒硒ularorblock-like.Themorphologyiscondensationafterextrudingandthesecond-phaseisdispersingOilthealloyingmatrix.Theresultoforthogonaltestsisthatthemechanicalpropertiesarebetterwhentheparametersare:thetemperatureofsolutionheattreatment37
6、5~385℃,holdingtime3.5~4.5h,agingtemperature120℃,agingtime4.5~6h,quenchingmediumwater.Themechanicalpropertiesdataare:themaximaltensilestrength:484MPa;Brinellhardness:120~130HB;elongationpercentage:5%~7%.Bothofsecond—phasedispersionandrefinedmicrostructuremaketh
7、estrengthimprovehighly.ThecorrosionresistanceofZA35-3.5MnalloyproducedbyspraydepositionispriortoZA35-3.5Mnalloyproducedbyfoundry.Thehomogenousdistributionofalloyingelement(Mn)onthematrixmodifieselectrodevoltage,SOthatthecorrosionresistanceofZA35-3.5Mnalloyisim
8、proved。ThewearresistanceofZA35-3.5Mnisimprovedhighlybecauseofthematrix’SreinforcementanddeductionofitstoefEcientoffriction.KeyWords:spraydeposition,alloyofZA35,microstructure,mecha
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