ASTM B933-16
Standard Test Method for Microindentation Hardness of Powder Metallurgy (PM) Materials
- Standard No.
- ASTM B933-16
- Release Date
- 2016
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM B933-20
- Latest
- ASTM B933-20
- Scope
5.1 Microindentation hardness testing provides a measure of the hardness of the microstructural constituents of a porous material. It indicates the hardness the material would have if there were no pores present and the material was tested using macroindentation hardness methods. Loads are limited to a maximum of 200 gf to reduce the likelihood of interference from the porosity.
5.2 Microindentation hardness tests allow the evaluation of specific phases, microstructural constituents, and regions or gradients too small for macroindentation hardness testing.
1.1 This test method covers the determination of the microindentation hardness of powder metallurgy (PM) materials. The test method differs from the approach used for pore-free materials in terms of the precautions required to deal with the porosity.
1.2 This procedure covers tests made with the Knoop or Vickers indenters under loads in the range from 1 to 200 gf.
1.3 Automated testing is not generally suitable for use with porous PM materials, because acceptable indentations require avoiding placing indentations in the immediate vicinity of a pore, a condition not guaranteed with automated placement of the indentations. Any automated testing shall allow for review of indentations post-test to reject any distorted or unusually large indentations in accordance with 9.4.
1.4 A method for converting the directly measured indentation lengths to other hardness scales, for example, HRC is described in Appendix X1.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM B933-16 Referenced Document
- ASTM B243 Standard Terminology of Powder Metallurgy
- ASTM E384 Standard Test Method for Microindentation Hardness of Materials
- ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM B933-16 history
- 2020 ASTM B933-20 Standard Test Method for Microindentation Hardness of Powder Metallurgy (PM) Materials
- 2016 ASTM B933-16 Standard Test Method for Microindentation Hardness of Powder Metallurgy (PM) Materials
- 2014 ASTM B933-14 Standard Test Method for Microindentation Hardness of Powder Metallurgy 40;PM41; Materials
- 2009 ASTM B933-09 Standard Test Method for Microindentation Hardness of Powder Metallurgy (P/M) Materials
- 2004 ASTM B933-04 Standard Test Method for Microindentation Hardness of Powder Metallurgy (P/M) Materials
