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1、7TheEffectsofCompositionontheHardnessPropertyofMetalsbyDanSchwarzSchoolofEngineeringGrandValleyStateUniversityLaboratoryModule4EGR250–MaterialScience&EngineeringSection01Instructor:Dr.P.N.AnyalebechiFebruary21,20067AbstractHardnessisthequalityofamaterialth
2、atallowsittowithstanddeformation.AvarietyofrelativescalingmethodssuchastheRockwellhardnessscalecanbeusedtoquantifythehardnessofamaterial.Composition,microstructureandprocessingconditionsofamaterialallcontributetoitshardnessbutthefollowinghardnessexperiment
3、isonlyaimedatestablishingarelationshipbetweenthecompositionandhardnesscharacteristicsofseveralmetalsamples.ThemetalsamplesaretestedusingtheRockwellBscaleandthematerialcompositionsarecomparedwiththeresultinghardnessvalues.Ferrousmaterialssuchascastironsands
4、teelswerefoundtobegenerallyharderthannon-ferrousmaterialssuchasaluminumalloys,copperalloys,andtitanium.Overall,themetalswerehardenedbyincreasedamountsofalloyingmaterials.IntroductionInthecontextofmaterialscience,hardnessisamechanicalpropertywhichallowsamat
5、erialtoresist“l(fā)ocalizedplasticdeformation”.[1]ThehardnessofamaterialiscommonlyquantifiedusingRockwell,Brinell,andVickersmethods.Ingeneral,thesemethodsdefinethehardnessofamaterialintermsoftheamountofdeformationproducedbyaloadedindenterthatisharderthanthetes
6、tspecimen.Hardnesstestingproducesrelativehardnessvaluessincedifferentindentersandloadingmethodscreateuniqueindentationsonthesametestspecimen.Engineeringmaterialsexhibitawiderangeofhardnessvaluesthatdependontheircomposition,microstructure,andprocessingmetho
7、ds.Themainobjectiveofthefollowingexperimentistoexploretherelationbetweenhardnessandcompositionofthirteenmetallicengineeringmaterials.Thesematerialshaveawiderangeofcompositionsthatcanbedividedintoferrousandnon-ferrouscategorieswithsubgroupsthatcontainvariou
8、salloys.ObtaininghardnessvaluesforeachmaterialwiththeRockwellBtestprovidesaframeworkforcomparingmaterialcompositionstotheirrespectivehardnessproperties.ExperimentalProcedureTheRockwellhardnesstesterwassettoth
