ASTM_D_7646_-_10_2019.pdf

Designation:D764610(Reapproved 2019)Standard Test Method forDetermination of Cooling Characteristics of AqueousPolymer Quenchants for Aluminum Alloys by Cooling CurveAnalysis1This standard is issued under the fixed designation D7646;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the description of the equipmentand the procedure for evaluating quenching characteristics ofaqueous polymer quenchants by cooling rate determination.1.2 This test method is designed to evaluate aqueous poly-mer quenchants for aluminum alloys in a non-agitated system.There is no correlation between these test results and the resultsobtained in agitated systems.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D6200 Test Method for Determination of Cooling Charac-teristics of Quench Oils by Cooling Curve AnalysisE220 Test Method for Calibration of Thermocouples ByComparison TechniquesE230 Specification for Temperature-Electromotive Force(emf)Tables for Standardized Thermocouples2.2 ISO Standards:3ISO 3819 Laboratory GlasswareBeakers2.3 Japanese Industrial Standards:4JIS K 2242 Heat Treating Oil2.4 Wolfson Engineering Group Specification:5Laboratory Tests for Assessing the Cooling Curve of Indus-trial Quenching Media3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 aqueous polymer quenchant,naqueous solutioncontaining a water soluble polymer;typically including poly-(alkylene glycol),poly(ethyl oxazoline),poly(sodium acrylate)and poly(vinyl pyrrolidone).The quenchant solution alsotypically contains additives for corrosion and foam control,ifneeded.Quench severity of aqueous polymer quenchants isdependent on concentration and molecular weight of thespecific polymer being evaluated,quenchant temperature,andagitation rate.3.1.2 characteristic temperature,ntransition temperaturefrom vapor blanket phase(film boiling phase)to rapid coolingphase(nucleate boiling phase)on cooling curve.3.1.3 cooling curve,ncooling curve is a graphical repre-sentation of the cooling time(t)temperature(T)response ofthe probe(see 7.3).An example is illustrated in Part B of Fig.1.3.1.4 cooling curve analysis,nthe process of quantifyingthe cooling characteristics of a heat treating oil based on thetemperature versus time profile obtained by cooling a pre-heated metal probe assembly(see Fig.2)under standardconditions.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.L0.06 on Non-Lubricating Process Fluids.Current edition approved May 1,2019.Published July 2019.Originally approvedin 2010.Last previous edition approved in 2014 as D7646 10(2014).DOI:10.1520/D7646-10R19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096,http:/www.sae.org.4Available from Japanese StandardsAssociation(JSA),Mita MT Bldg.,3-13-12Mita,Minato-ku,Tokyo 108-0073,Japan,http:/www.jsa.or.jp.5Available from Wolfson Heat Treatment Centre,Aston University,AstonTriangle,Birmingham B4 7ET,England,http:/www.sea.org.uk/whtc/.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.1.5 cooling rate curve,nThe cooling rate curve isobtained by calculating the first derivative(dT/dt)of thecooling timetemperature curve.An example is illustrated inPart B of Fig.1.3.1.6 quench severity,nthe ability of a quenching mediumto extract heat from a hot metal.3.1.7 quench