ASTM A1038-08
(Practice)Standard Practice for Portable Hardness Testing by the Ultrasonic Contact Impedance Method
Standard Practice for Portable Hardness Testing by the Ultrasonic Contact Impedance Method
SIGNIFICANCE AND USE
The hardness of a material is a defined quantity having many scales and being dependent on the way the test is performed. In order to avoid the creation of a new practice involving a new hardness scale, the UCI method converts into common hardness values, for example, HV, HRC, etc.
The UCI hardness test is a superficial determination, only measuring the hardness condition of the surface contacted. The results generated at a specific location do not represent the part at any other surface location and yield no information about the material at subsurface locations.
The UCI hardness test may be used on large or small components at various locations. It can be used to make hardness measurements on positions difficult to access, such as tooth flanks or roots of gears.
SCOPE
1.1 This practice covers the determination of comparative hardness values by applying the Ultrasonic Contact Impedance Method (UCI Method).
1.2 The measured values are stated in SI units, which are regarded as standard. Equivalent inch-pound values, when given, are in parentheses and may be approximate.
1.3 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.
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Designation:A1038–08
Standard Practice for
Portable Hardness Testing by the Ultrasonic Contact
1
Impedance Method
This standard is issued under the fixed designation A1038; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of 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* based on the measurement of the frequency shift of a resonat-
ingrodcausedbytheessentiallyelasticnatureofthefinitearea
1.1 This practice covers the determination of comparative
of contact between the indenter and the test piece during the
hardness values by applying the Ultrasonic Contact Impedance
penetration.
Method (UCI Method).
3.1.2 UCI hardness test—a hardness testing practice using a
1.2 The measured values are stated in SI units, which are
calibrated instrument by pressing a resonating rod with a
regarded as standard. Equivalent inch-pound values, when
defined indenter, for example, a Vickers diamond, with a fixed
given, are in parentheses and may be approximate.
force against the surface of the part to be tested.
1.3 This standard does not purport to address all of the
3.1.3 calibration—determination of the specific values of
safety concerns, if any, associated with its use. It is the
the significant operating parameters of the UCI instrument by
responsibility of the user of this standard to establish appro-
comparisonwithvaluesindicatedbyastandardizedworkbench
priate safety and health practices and determine the applica-
hardness tester or by a set of certified reference test pieces.
bility of regulatory limitations prior to use.
3.1.4 verification—checking or testing the UCI instrument
2. Referenced Documents to ensure conformance with this practice.
2
3.1.5 surface finish—all references to surface finish in this
2.1 ASTM Standards:
practice are defined as surface roughness (that is, Ra = average
A370 Test Methods and Definitions for Mechanical Testing
roughness value).
of Steel Products
E10 Test Method for Brinell Hardness of Metallic Materials
4. Significance and Use
E18 Test Methods for Rockwell Hardness of Metallic Ma-
4.1 The hardness of a material is a defined quantity having
terials
many scales and being dependent on the way the test is
E92 Test Method for Vickers Hardness of Metallic Materi-
performed. In order to avoid the creation of a new practice
als
involving a new hardness scale, the UCI method converts into
E140 Hardness Conversion Tables for Metals Relationship
common hardness values, for example, HV, HRC, etc.
Among Brinell Hardness, Vickers Hardness, Rockwell
4.2 The UCI hardness test is a superficial determination,
Hardness, Superficial Hardness, Knoop Hardness, and
only measuring the hardness condition of the surface con-
Scleroscope Hardness
tacted. The results generated at a specific location do not
E384 Test Method for Microindentation Hardness of Mate-
represent the part at any other surface location and yield no
rials
information about the material at subsurface locations.
3. Terminology 4.3 The UCI hardness test may be used on large or small
components at various locations. It can be used to make
3.1 Definitions:
hardness measurements on positions difficult to access, such as
3.1.1 UCI method—Ultrasonic Contact Impedance, a hard-
tooth flanks or roots of gears.
ness testing method developed by Dr. Claus Kleesattel in 1961
A. GENERAL DESCRIPTION OF INSTRUMENTS
1
This practice is under the jurisdiction of ASTM Committee A01 on Steel,
AND TEST PROCEDURE FOR UCI HARDNESS
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
TESTING
A01.06 on Steel Forgings and Billets.
Current edition approved Nov. 1, 2008. Published November 2008. Originally
5. Apparatus
approved in 2005. Last previous edition approved in 2005 as A1038 – 05. DOI:
10.1520/A1038-08.
5.1 Instruments used for UCI hardness testing generally
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
consist of (1) a probe containing a rod with a defined indenter,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
for example, aVickers diamond, attached to the contacting end
Standards volume information, refer to the standard’s Document Summary page on
per Test Method E92 and Test Method E384, (2) vibration
the ASTM website.
*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.
1
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A1038–08
generating means, (3) vibration detecting means, (4) electronic The frequency shift becomes larger if the indenter penetrates
means for the numerical evaluati
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:A1038–05 Designation:A1038–08
Standard Practice for
Portable Hardness Testing by the Ultrasonic Contact
1
Impedance Method
This standard is issued under the fixed designation A 1038; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of 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 the determination of comparative hardness values by applying the Ultrasonic Contact Impedance
Method (UCI Method).
1.2
1.2 The measured values are stated in SI units, which are regarded as standard. Equivalent inch-pound values, when given, are
in parentheses and may be approximate.
1.3 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.
2. Referenced Documents
2
2.1 ASTM Standards:
A 370 Test Methods and Definitions for Mechanical Testing of Steel Products
E 10 Test Method for Brinell Hardness of Metallic Materials
E 18Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials Test Methods for Rockwell
Hardness of Metallic Materials
E 92 Test Method for Vickers Hardness of Metallic Materials
E 140Test Method for Hardness Conversion Tables for Metals Hardness Conversion Tables for Metals Relationship Among
Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, and Scleroscope Hardness
E 384 Test Method for Microindentation Hardness of Materials
3. Terminology
3.1 Definitions:
3.1.1 UCI method—Ultrasonic Contact Impedance, a hardness testing method developed by Dr. Claus Kleesattel in 1961 based
on the measurement of the frequency shift of a resonating rod caused by the essentially elastic nature of the finite area of contact
between the indenter and the test piece during the penetration.
3.1.2 UCI hardness test—a hardness testing practice using a calibrated instrument by pressing a resonating rod with a defined
indenter, for example, a Vickers diamond, with a fixed force against the surface of the part to be tested.
3.1.3 calibration—determination of the specific values of the significant operating parameters of the UCI instrument by
comparison with values indicated by a standardized workbench hardness tester or by a set of certified reference test pieces.
3.1.4 verification—checking or testing the UCI instrument to ensure conformance with this practice.
3.1.5 surface finish—all references to surface finish in this practice are defined as surface roughness (that is, Ra = average
roughness value).
4. Significance and Use
4.1 The hardness of a material is a defined quantity having many scales and being dependent on the way the test is performed.
In order to avoid the creation of a new practice involving a new hardness scale, the UCI method converts into common hardness
values, for example, HV, HRC, etc.
1
This practice is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.06
on Steel Forgings and Billets.
Current edition approved Jan. 1, 2005. Published February 2005.
Current edition approved Nov. 1, 2008. Published November 2008. Originally approved in 2005. Last previous edition approved in 2005 as A 1038 – 05.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*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.
1
---------------------- Page: 1 ----------------------
A1038–08
4.2 The UCI hardness test is a superficial determination, only measuring the hardness condition of the surface contacted. The
results generated at a specific location do not represent the part at any other surface location and yield no information about the
material at subsurface locations.
4.3 The UCI hardness test may be used on large or small components at various locations. It can be used to make hardness
measurements on positions difficult to access, such as tooth flanks or roots of gears
...
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