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  • ASTM
    B610-13 Standard Test Method for Measuring Dimensional Changes Associated with Processing Metal Powders
    Edition: 2013
    $91.10
    Unlimited Users per year

Description of ASTM-B610 2013

ASTM B610 - 13

Standard Test Method for Measuring Dimensional Changes Associated with Processing Metal Powders

Active Standard ASTM B610 | Developed by Subcommittee: B09.02

Book of Standards Volume: 02.05




ASTM B610

Significance and Use

5.1 Dimensional Change When Compacting and Sintering Metal Powders:

5.1.1 The dimensional change value obtained under specified conditions of compacting and sintering is a material characteristic inherent in the powder.

5.1.2 The test is useful for quality control of the dimensional change of a metal powder mixture, to measure compositional and processing changes and to guide in the production of PM parts.

5.1.3 The absolute dimensional change may be used to classify powders or differentiate one type or grade from another, to evaluate additions to a powder mixture or to measure process changes, and to guide in the design of tooling.

5.1.4 The comparative dimensional change is mainly used as a quality control test to measure variations between a lot or shipment of metal powder and a reference powder of the same material composition.

5.1.5 Factors known to affect size change are the base metal powder grade, type and lot, particle size distribution, level and types of additions to the base metal powder, amount and type of lubricant, green density, as well as processing conditions of the test specimen; heating rate, sintering time and temperature, sintering atmosphere, and cooling rate.

5.2 Dimensional Change of Various PM Processing Steps:

5.2.1 The general procedure of measuring the die or a test compact before and after a PM processing step, and calculating a percent dimensional change is also adapted for use as an internal process evaluation test to quantify green expansion, repressing size change, heat treatment changes or other changes in dimensions that result from a manufacturing operation.

1. Scope

1.1 This standard covers a test method that may be used to measure the sum of the changes in dimensions that occur when a metal powder is first compacted into a test specimen and then sintered.

1.2 The dimensional change is determined by a quantitative laboratory procedure in which the arithmetic difference between the dimensions of a die cavity and the dimensions of a sintered test specimen produced from that die is calculated and expressed as a percent growth or shrinkage.

1.3 With the exception of the values for density and the mass used to determine density, for which the use of the gram per cubic centimetre (g/cm 3 ) and gram (g) units is the long-standing industry practice, the values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

B215 Practices for Sampling Metal Powders

B243 Terminology of Powder Metallurgy

B328 Test Method for Density, Oil Content, and Interconnected Porosity of Sintered Metal Structural Parts and Oil-Impregnated Bearings

B925 Practices for Production and Preparation of Powder Metallurgy (PM) Test Specimens

IEEE/ASTM SI 10 American National Standard for Metric Practice


Keywords

absolute; dimensional change; compacting; comparative dimensional change; due size; metal powders; sintering;


ICS Code

ICS Number Code 77.160 (Powder metallurgy)


DOI: 10.1520/B0610

ASTM International is a member of CrossRef.

ASTM B610

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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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