1、Designation: B528 10Standard Test Method forTransverse Rupture Strength of Powder Metallurgy (PM)Specimens1This standard is issued under the fixed designation B528; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last r
2、evision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers determination of the transverserupture strength of sintered, including post-treated, powdermetallur
3、gy test specimens by subjecting them to a uniformlyincreasing transverse force under controlled conditions. Theterm “transverse rupture strength” as used herein, defines thestress, calculated from the flexure formula required to break aspecimen as a simple beam supported near the ends andapplying th
4、e force midway between the fixed line center of thesupports.1.2 Limitations The transverse rupture test is only appli-cable to relatively brittle materials. In cases where a ductilespecimen is being tested and the permanent deflection as aresult of testing exceeds 0.020 in. (0.50 mm), the test resul
5、tsmay be questionable.1.3 Test Method B406 should be consulted for determiningthe transverse rupture strength of cemented carbides.1.4 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for in
6、formation onlyand are not considered standard.1.5 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-bility of regul
7、atory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B243 Terminology of Powder MetallurgyB312 Test Method for Green Strength of Specimens Com-pacted from Metal PowdersB406 Test Method for Transverse Rupture Strength ofCemented CarbidesB925 Practices for Production and Preparati
8、on of PowderMetallurgy (PM) Test SpecimensE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 DefinitionsFor definitions of terms in this test method,see Terminology B243.4. Significance and Use4.1 This test method is used to measure the
9、strength ofsintered, including post-treated, specimens. Transverse rupturestrength is not a design value. For many sintered materials,transverse rupture strength is approximately twice the ultimatetensile strength.5. Apparatus5.1 Micrometer, capable of measuring with a resolution of0.0001 in. (0.002
10、 mm).5.2 Transverse Rupture Strength Fixture, as shown in Fig. 1.5.3 Compression Testing Machine, readable to within 0.1 %of full scale reading. Use the lowest testing range that canprovide a measurable result.6. Test Specimen6.1 The thin test specimen shall have the shape and dimen-sions shown in t
11、he figure titled PM Transverse RuptureStrength Test Specimen of Practices B925.7. Procedure7.1 Prepare test specimens by pressing and sintering usingtooling shown in the figure titled Transverse Rupture TestSpecimen, Typical Laboratory Tooling of Practices B925,ormachine from finished parts. Measure
12、 the width and thicknessof the specimens to the nearest 0.001 in. (0.02 mm) with amicrometer.7.2 Locate the specimen in the transverse rupture test fixtureperpendicular to the supporting rods. Apply compressive forceparallel to the pressing direction of the specimen at a no-loadcrosshead speed of no
13、t greater than 0.2 in. (5.0 mm)/min until1This test method is under the jurisdiction of ASTM Committee B09 on MetalPowders and Metal Powder Products and is the direct responsibility of Subcom-mittee B09.05 on Structural Parts.Current edition approved June 1, 2010. Published September 2010. Originall
14、yapproved in 1970. Last previous edition approved in 2005 as B528 05. DOI:10.1520/B0528-10.2For 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 Su
15、mmary page onthe ASTM website.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.rupture occurs. Record the load at which the specimen breaks(force required to rupture sp
16、ecimen, P).8. Calculation8.1 Calculate the transverse rupture strength of the speci-men as follows:TRS 5 3 3 P 3 L! / 2 3 t23 w! (1)where:TRS = transverse rupture strength of the specimen, psi(MPa),P = force required to rupture the specimen, lbf (N),L = the distance between the centers of the suppor
17、tingrods, 1.000 in. (25.4 mm),w = width of the specimen, in. (mm), andt = thickness of specimen, in. (mm).9. Report9.1 Report the transverse rupture strength in pounds-forceper square inch (megapascals) to the nearest 1000 psi (10MPa). When reporting the results, state the following supple-mentary d
18、ata to clarify the results:9.1.1 Identification of the material being tested, that is,composition, density, state of heat treatment, and compacted ormachined specimen.10. Precision310.1 The repeatability (r) and reproducibility (R) measure-ments were determined (1995) according to Practice E691 anda
19、re listed in Table 1 for six materials and a range of transverserupture strength values. On the basis of test error alone, thedifference in absolute value of two test results obtained in thesame laboratory will be expected to exceed (r) only 5 % of thetime. If such a difference is found to be larger
20、 than (r), there isreason to question one or both results. Similarly, the differencein two test results obtained in different laboratories will beexpected to exceed (R) only 5 % of the time. If the differenceis found to be larger than (R), there is reason to question one orboth measurements.3The pre
21、cision for this test method was developed by the Metal PowderIndustries Federation (MPIF) and is used herein with their permission.NOTEThis fixture is used in Test Method B312.FIG. 1 Transverse Rupture Test FixtureB528 10211. Keywords11.1 flexural strength; 3 Point Bend Test; transverse rupture;tran
22、sverse rupture strength; TRSSUMMARY OF CHANGESCommittee B09 has identified the location of selected changes to this standard since the last issue, B528 99,that may impact the use of this standard. (June 1, 2010)(1) In 1.4 changed the statement on units.(2) In 5.3 changed the definition of the appara
23、tus used to breakthe test specimens.(3) In 7.2 changed the recording of the breaking force from thenearest 10 lbf (50 N) to noting the load at which the specimenbreaks. The resolution with which the breaking force needs tobe measured depends on the strength of the material.(4) Inserted the precision
24、 statement from MPIF Standard 41 inSection 10.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, a
25、nd the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revis
26、ion of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you s
27、houldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be ob
28、tained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Precision of T
29、ransverse Rupture StrengthAMaterial Densityg/cm3ApparentHardnessTRSpsi#Labs (r)psi(R)psiF-0005-15 6.22 37 HRB 63 000 19 4800 7900FC-0205-30 6.21 43 HRB 66 500 16 5600 11 500F-0005-25 6.91 40 HRB 71 000 12 5500 14 000FN-0208-35 6.95 77 HRB 123 500 19 6900 11 600FL-4405-40 7.04 75 HRB 129 500 16 7000
30、13 800FC-0208-50 6.69 81 HRB 144 000 12 12 500 21 000FC-0208-65HT 6.43 31 HRC 138 500 22 15 400 28 000F-0008-65HT 6.68 35 HRC 148 500 16 22 000 31 700FLC-4608-70HT 6.69 31 HRC 174 000 14 28 800 41 500FN-0205-105HT 6.93 31 HRC 191 500 14 23 700 40 500FC-0205-90HT 7.03 41 HRC 236 000 16 28 100 42 400FLN-4205-140HT 7.12 41 HRC 251 500 22 32 700 46 900FLN2-4405-160HT 7.04 38 HRC 246 000 35 21 500 31 200AThe (r) and (R) values were determined from the testing of three (3) transverserupture test specimens by each participating laboratory.B528 103
