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ASTM B721

1991 Edition, 1991

Complete Document

Standard Test Method for Microhardness and Case Depth of Powder Metallurgy (P/M) Parts

Includes all amendments and changes through Reapproval Notice , 1999


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Detail Summary

Superseded By: ASTM B931

EN
Additional Comments:
W/D S/S BY ASTM B931,B933 AND ASTM B934
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Product Details:

  • Revision: 1991 Edition, 1991
  • Published Date: January 1999
  • Status: Superseded By:
  • Superseded By: ASTM B931
  • Document Language: English
  • Published By: ASTM International (ASTM)
  • Page Count: 4
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

1. Scope

1.1 This test method covers determination of the microhardness of powder metallurgy (P/M) parts and applications of microhardness test results to methods for determination of the case depth. Technique for measurement of case depth of P/M parts by observation is also outlined.

1.2 Part A: Microhardness Measurement--This procedure covers test methods to determine the microhardness of P/M parts with the Knoop (HK) or the Vickers (HV) indenters. Procedures for surface preparation of the P/M material prior to microhardness measurement are included.

1.3 Part B: Case Depth Measurement--Procedures and methods for determination of both effective case depth and observed case depth for P/M parts are included. The principles of Part A on Microhardness Measurement are utilized to measure case depth.

1.4 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are for information only.

1.5 This standard does not purport to address 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.