ASTM B648-2010(2015)e1 Standard Test Method for Indentation Hardness of Aluminum Alloys by Means of a Barcol Impressor《用巴科压痕器硬度计测量铝合金的压痕硬度的标准试验方法》.pdf
《ASTM B648-2010(2015)e1 Standard Test Method for Indentation Hardness of Aluminum Alloys by Means of a Barcol Impressor《用巴科压痕器硬度计测量铝合金的压痕硬度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM B648-2010(2015)e1 Standard Test Method for Indentation Hardness of Aluminum Alloys by Means of a Barcol Impressor《用巴科压痕器硬度计测量铝合金的压痕硬度的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B648 10 (Reapproved 2015)1Standard Test Method forIndentation Hardness of Aluminum Alloys by Means of aBarcol Impressor1This standard is issued under the fixed designation B648; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re
2、vision, 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.1NOTEAppendix X1 was moved to appear one page in October 2015.1. Scope1.1 This test method covers the determin
3、ation of indentationhardness of aluminum alloys using a Barcol Impressor, ModelNo. 934-1.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.2.1 ExceptionThe values given in parentheses are forinformation only.NOTE 1Another mo
4、del, No. 935, is for use on plastics but is notincluded in this test method and should not be used for aluminum alloys.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-pri
5、ate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E6 Terminology Relating to Methods of Mechanical TestingE10 Test Method for Brinell Hardness of Metallic MaterialsE18 Test Methods for Rockwell Hardness
6、of Metallic Ma-terialsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 DefinitionsThe definitions of terms relating to hard-ness testing appearing in Terminology
7、E6 shall be consideredas applying to the terms used in this test method.4. Significance and Use4.1 The Barcol Impressor is portable and therefore usefulfor in situ determination of the hardness of fabricated parts andindividual test specimens for production control purposes.4.2 This test method shou
8、ld be used only as cited inapplicable material specifications.5. Apparatus5.1 Barcol Impressor, Model 934-1 See Fig. 1 and Fig. 2.5.2 IndentorThe indentor shall consist of a hardened steeltruncated cone having an angle of 26 with a flat tip 0.157 mm(0.0062 in.) in diameter. It shall fit into a hollo
9、w spindle and beheld down by a spring-loaded plunger. See Fig. 2.5.3 Indicating DeviceThe indicating dial shall have 100divisions, each representing a depth of 0.0076 mm (0.00030in.) penetration. The higher the reading, the harder the material.6. Test Parts or Specimen6.1 The testing area shall be s
10、mooth, clean, and free ofmechanical damage. The surface may be lightly polished toeliminate scratches or die lines. It shall be such that it can beessentially perpendicular to the indentor during the test.NOTE 2The effect of curvature of the test specimen on the BarcolImpressor readings is presented
11、 in Appendix X1, Fig. X1.1.6.2 DimensionsTest parts or specimens shall be at least1.5 mm (116 in.) thick and large enough to ensure a minimumdistance of 3 mm (18 in.) in any direction from the indentorpoint to the edge.7. Calibration7.1 With the plunger upper guide backed out until it justengages th
12、e spring, place the impressor on a glass surface andpress down until the penetrator point is forced all the way backinto the lower plunger guide. The indicator should then read100 6 1. If it does not, loosen the locknut and turn the lowerplunger guide in or out to obtain a reading of 100.1This test
13、method is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility of Subcommittee B07.05 onTesting.Current edition approved Oct. 1, 2015. Published October 2015. Originallyapproved in 1978. Last previous edition approved in 2010 as B648 10. DOI:10.1520
14、/B0648-10R15E01.2For 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.Copyright ASTM International, 100 Barr Harbor
15、 Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17.2 Read the hardness of a “hard” aluminum alloy referencedisk supplied by the manufacturer of the impressor and, ifnecessary, adjust so that the reading is within the range markedon the disk.7.3 Repeat the process with a “soft” re
16、ference disk.7.4 If the reference readings cannot be obtained, subsequentmeasurements are not valid.8. Procedure8.1 Support the test parts or specimens on a hard, firmsurface if they are likely to bend or deform under the pressureof the indentor (Note 3). The indentor must be perpendicular tothe sur
17、face being tested.NOTE 3Curved surfaces may be more difficult to support. When theload is applied, bending and spring action in the part or specimen shouldbe avoided.8.2 Grasp the impressor firmly between leg and point sleeveand set both on the surface to be tested. For irregular parts orsmall speci
18、mens this may require the impressor leg to beshimmed so that the indentor will be perpendicular to the testsurface.8.3 Quickly apply by hand sufficient pressure (4 to 7 kg, or10 to 15 lb) on the housing to ensure firm contact with the testspecimen and record the highest dial reading to the nearest 0
19、.5division (Note 4). Take care to avoid sliding or scraping whilethe indentor is in contact with the surface being tested.NOTE 4For relatively soft materials, the dial may indicate some drifttoward lower numbers with time after the initial pressure. For this reasonit is recommended that readings be
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