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1、h Bnellhaess tetisomoy used t detrminete hdness o matrials lke mtal ad alos。hetst is hedyapplyg known lodt thsufco thested terial hrug ahrdened stlbal ofnown ameer。 Th iameter of th esuling permann impression n the tested tal s mearedandh Brnell Hadness umbr i calcltaH 2 P /( D ( （2 d2)1/)） (1)whreB
2、HN Briell adness umbrP = d on e ndntntool (k)D diamter o seball （)d = sure dimeter at rim f th imsson (mm)It isdesirae ta the st loa are lied toimpressiondameter i the rage of 25 4。75 m。Appmte ods an Bnel Hrnes Nmber：BrinellHardnss Nmbead （kg)160 - 00300080- 30102610050Typica Bnll HarnssNumbrs or Me
3、talMateialBrinellHarnes NumberSoft bass0Mldtel13Annale chise see235White ast in4Nitridsufce50tarns versus StrenthBinellVickrs Rockwel EuvaetImprsio iater(mm)ards HBHardness HVardness Hadnes （tn/in2）（g/mm2)（Nmm2）250601640-57。0-2。55586155602。6055591120.5-2。553456911953.5-2.7545411920-2。5455111.0-2.804
4、775081149。5。541491116。50160592。90444741157。98115209542945115591014713.004140144.592154223。401451143088139133.08410114208513413143。153753610。521253203310398012612363.5523711080771173303413601935751817。5331350103.311411183.43213391834。5711111089343181080610710493503023191072.61041005523910。06401903。62
5、83011306997137920429.0696941.702692810425593123。75627106。5589189380556910225.55689873385248261024.055785。9125310023。538482953524792518944。00229419820。50777.052325977755421728964767454.5223964673716。0207219545716964。3097208343686674。018717914165674501989-39626084。0170187-65794。701312853555394。8015616
6、5833454。90491578-251505.00435093498.1744731448.011137430415。0126133794641.4121277-28444。5011268-274342256111166-264102。701113-259382。01318612438373FiagamThe Brnl cal caeiz thendntaionarness of aterials throuh th scleofpneraion ofan ndenter，laded on a material ttpiece.tis one veral dfintonsf hardnes
7、inmatrils sec。Proed by wedh enginer Jhan Agust Brnel in1900, its thirstiy ed andstandrisd haness stinngnering an mtallurgy Te larize of neationand ossible damage totst-piee lmitsi sefulne.Tetypcal tst use a1millimetes （039 in） diamter stl ball asan indeer with ,00 kgf （29 N; ，600 l） force. Fr ofer m
8、teria，a marfore isued; or harer materials， atunstencarbie all is ubsited forthe see bal。 The indentaton is mesured and hadess calculated s:were：= aplied forc（k）D= diaeter of dente （mm）d= iamee of ndentatn（mm）Te BHNcan be cert i te utimate tenle trenh (UT), g the rlationshp is dependent on thmtria， a
9、ndere determid emirically。 he relatonhip sbas on yers idex （n) frm Meyrs a. If Meyes inde s le tan .2 tn h ratio f T to BH is 36 I Meyers index geater an2。2, then the ri increases.1BHN is dsignated byteotcomo us te taards （ASTM E1122 andSO 656:0053） HBW（H rom rdness, B frombrinll an W from the maeia
10、 thendnt, tungsen （wlram） carbide). I frmer tadads HorHS were used toeero mearemntmad wih teel indenter.HBWis clculated in ostndad usng he S uitsswhere:F=apled fore （N)D= dmer ofndenter (mm）d= iameter ofnentaion （m）ommn valuesedhenuongaBin hardnss number(BHN or mrecmmon H)，th codiionso the testused o obtinte nu
