ASTM B917 B917M-2011 Standard Practice for Heat Treatment of Aluminum-Alloy Castings from All Processes《全部工艺用铝合金铸件热处理的标准实施规程》.pdf
《ASTM B917 B917M-2011 Standard Practice for Heat Treatment of Aluminum-Alloy Castings from All Processes《全部工艺用铝合金铸件热处理的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM B917 B917M-2011 Standard Practice for Heat Treatment of Aluminum-Alloy Castings from All Processes《全部工艺用铝合金铸件热处理的标准实施规程》.pdf(14页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B917/B917M 11Standard Practice forHeat Treatment of Aluminum-Alloy Castings from AllProcesses1This standard is issued under the fixed designation B917/B917M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of
2、last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This practice covers, when specified by material speci-fication or purchase order, the heat treatment of aluminumallo
3、y castings from all casting processes.1.1.1 The heat treatment of aluminum alloy castings used inspecific aerospace applications is covered in AMS 27712andspecific AMS2material specifications.1.1.2 The heat treatment of wrought aluminum alloys iscovered in Practice B918/B918M.1.2 The values stated i
4、n either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.2.1 SI U
5、nitsThe SI units are shown in brackets or inseparate tables.1.3 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 and health practices and determine the applica-b
6、ility of regulatory limitations prior to use.2. Referenced Documents2.1 The following documents of the issue in effect on thedate of material purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:3B26/B26M Specification for Aluminum-Alloy Sand Cast-ingsB108/B10
7、8M Specification for Aluminum-Alloy Perma-nent Mold CastingsB275 Practice for Codification of Certain Nonferrous Met-als and Alloys, Cast and WroughtB557 Test Methods for Tension Testing Wrought and CastAluminum- and Magnesium-Alloy ProductsB557M Test Methods for Tension Testing Wrought and CastAlum
8、inum- and Magnesium-Alloy Products (Metric)B618/B618M Specification for Aluminum-Alloy Invest-ment CastingsB686/B686M Specification for Aluminum Alloy Castings,High-StrengthB881 Terminology Relating toAluminum- and Magnesium-Alloy ProductsB918/B918M Practice for Heat Treatment of Wrought Alu-minum A
9、lloysB955/B955M Specification for Aluminum-Alloy Centrifu-gal CastingsB969 Specification for Aluminum-Alloy Castings Producedby the Squeeze Casting, Thixocast and Rheocast Semi-Solid Casting ProcessesG110 Practice for Evaluating Intergranular Corrosion Re-sistance of Heat TreatableAluminumAlloys by
10、Immersionin Sodium Chloride + Hydrogen Peroxide Solution2.3 ANSI Standard:H35.1 Alloy and Temper Designation Systems for Alumi-num42.4 SAE Standard:AMS 2771 Heat Treatment of Aluminum Alloy Castings3. Terminology3.1 Definitions:3.1.1 Refer to Terminology B881 for terminology relating tothe heat trea
11、tment of castings.4. Equipment4.1 Heating MediaAluminum castings are typically heattreated in air chamber furnaces; however, lead baths, oil baths,fluidized beds, or even superheated steam may be used inspecific applications. The use of uncontrolled heating is notpermitted. Whichever heating means a
12、re employed, carefulevaluation is required to ensure that the casting responds1This practice is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility of Subcommittee B07.01 onAluminum Alloy Ingots and Castings.Current edition approved May 1, 2011. Pu
13、blished June 2011. Originallyapproved in 2001. Last previous edition approved in 2009 as B917/B917M 09.DOI: 10.1520/B0917_B0917M-11.2Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001, http:/www.sae.org.3For referenced ASTM standards, visit the ASTM
14、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.4Available from Aluminum Association, Inc., 1525 Wilson Blvd., Suite 600,Arlington, VA 22209, http:/www.alum
15、inum.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.properly to heat treatment and is not overheated or damaged bythe heat treatment environment. Salt baths are n
16、ot recom-mended for the commercial heat treatment of aluminumcastings in volume. (WarningNitrate baths must not be usedin the heat treatment of 5xx.0 series castings because of theinherent explosion hazard.4.2 Air Chamber Furnacesmay be oil or gas-fired or maybe electrically heated. The atmosphere i
17、n air chamber furnacesmust be controlled to prevent porosity resulting from solutionheat treatment. Furnace components that are significantlyhotter than the metal should be suitably shielded for sectionthicknesses of less than 0.250 in. 6 mm to prevent adverseradiation effects. The atmosphere in air
18、 chamber furnaces mustbe controlled to prevent porosity resulting from solution heattreatment (see Note 1). The suitability of the atmosphere in anair-chamber furnace can be demonstrated by testing, in accor-dance with 8.4.3.1, that products processed in that furnace aresubstantially free of heat tr
19、eat induced porosity.NOTE 1Heat treat induced porosity may lower mechanical propertiesand commonly causes blistering of the surface of the material. Thecondition is most likely to occur in furnaces in which the products ofcombustion contact the work, particularly if the gases are high in watervapor
20、or contain compounds of sulfur. Surface discoloration is a normalresult of solution heat treatment of aluminum alloys and should not beinterpreted as evidence of damage from overheating or as heat treatinduced porosity.4.3 Automatic Recording and Control Equipmentto con-trol temperature of air furna
21、ces shall be capable of maintainingtemperature in the working zone to within 610F 65C ofthe specified temperature.4.4 Quench BathsQuenching is normally performed byimmersion of castings in a hot-water bath as described inTables 1-4. The water baths must be located close enough tosolution heat-treati
22、ng facilities to minimize delay in quenching.Tanks must be of adequate size for the expected work load andmust have the means of providing adequate circulation of thequenching media about the work load. Means for heating orcooling the quench water should be available when needed.NOTE 2Quenching may
23、be performed by alternative means such astotal immersion in a glycol and water solution, a liquefied gas, cold water,hot water, or boiling water, or by air blast or fog to minimize distortionprovided samples from the material, so quenched, will conform to the (1)mechanical properties, (2) other requ
24、irements of the applicable castingspecification and (3) not exhibit more intergranular corrosion susceptibil-ity than if the metal was immersion quenched in cold water. The use ofwater sprays or high-velocity high-volume jets of water in which thematerial is thoroughly and effectively flushed is sat
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