GOST 26528-98

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  ГОСТ 26528-98

GOST 26528−98 (ISO 5754−78) sintered metal Materials, excluding hardmetals. Test method for impact strength

GOST 26528−98
(ISO 5754−78)

Group B59

INTERSTATE STANDARD

SINTERED METAL MATERIALS, EXCLUDING HARDMETALS

Test method for impact strength

Sintered metal materials, excluding hardmetals. Impact test method

ISS 77.160
AXTU 1909

Date of introduction 2001−07−01

Preface

1 DEVELOPED by the Intergovernmental Committee for standardization MTK 150; Institute for problems of materials science im. I. N. Frantsevich of NAS of Ukraine

SUBMITTED to the State Committee of Ukraine for standardization, Metrology and certification

2 ADOPTED by the Interstate Council for standardization, Metrology and certification (minutes N 13 dated 28.05.98)

The adoption voted:

3 this standard is a full authentic text of international standard ISO 5754−78 «sintered metal Materials, excluding hardmetals. Samples without a cut for testing the impact load» and contains additional requirements that reflect the needs of the economy

4 Resolution of the State Committee of the Russian Federation for standardization and Metrology dated December 19, 2000 N 384-St inter-state standard GOST 26528−98 (ISO 5754−78) introduced directly as a state standard of the Russian Federation from July 1, 2001

5 REPLACE GOST 26528−85

1 Scope

This standard specifies a method for testing the impact strength of the samples (with incision or without incision) sintered metal (powder) materials.

This standard does not apply to powder hard alloys and materials based on refractory compounds.

Additional requirements that reflect the needs of the economy, in italics.

2 Normative references

In this standard, referenced GOST 9454−78 Metals. Test method for impact strength at low, room and elevated temperatures

3 the essence of the method

The method consists in the destruction of the sample (with incision or without incision) by one stroke pendulum with subsequent determination of impact on a scale copra or the calculation of toughness.

4 sampling Method

4.1 the Method of sampling and preparation of samples for the tests according to the normative document in sintered (powder) materials (products) with the amendments specified in 4.1.1.-4.1.6.

4.1.1 Samples can be obtained by mechanical processing of finished products, and machined, if it does not affect the test results.

Place tenderloin pieces for samples from finished products, the types and modes of machining should be specified in the normative document on the specific product.

4.1.2 the Direction of pressing should be marked on the samples.

4.1.3 Selection of samples (with incision or without incision) for testing stipulate the instrument for specific material (product).

4.1.4 the Shape and dimensions of notched specimens shall conform to GOST 9454.

4.1.5 Samples without incision must meet the requirements listed in Appendix A.

Samples should be made two-way pressing, followed by sintering under the same conditions as the finished product.

4.1.6 the Number of samples for testing must be specified in the regulatory document for material (product).

5 Equipment and materials

Equipment and materials — according to GOST 9454.

6 Preparation for testing

6.1 Preparation for testing — according to GOST 9454 with the additions specified in 6.1.1, 6.1.2.

6.1.1 Before testing, the samples are subjected to visual inspection without using of magnifying means.

On the surface of the samples shall be free of protuberances, dents, cracks, burrs, delaminations, inclusions, cavities and mechanical damage.

6.1.2 the Width and height measured in the middle part of the sample with an accuracy of at least 0,01 mm.

7 testing

7.1 the Test for impact strength is carried out according to GOST 9454 with the additions specified in 7.1.1, 7.1.2.

7.1.1 the impact Direction should be perpendicular to the direction of pressing, if not stated otherwise the direction of the instrument for specific material.

7.1.2 the Test to be valid, if the sample with a single stroke of the knife pendulum is completely destroyed.

8 Processing of results

8.1 the work of the blow , George spent on the destruction of the sample, measured on a scale of pendulum.

8.2 Processing of results of tests of notched specimens is carried out according to GOST 9454.

8.3 the Impact strength of the samples without an incision , Kj/cm, is calculated by the formula

, (1)

where is the job of the shock, j;

the cross — sectional area of sample, cm.

The results of calculations are rounded to the nearest whole number when more than 10 j/cm; up to the first decimal place — with less than 10 j/cm.

The work of impact and the toughness of the specimen without incision designate in accordance with Annex B

.

8.4 For the value of work impact or notch toughness of samples take the arithmetic mean of the results of their tests.

8.5 test Results recorded in a Protocol containing:

— brand material;

— the numbers, sizes, types and conditions of manufacture of the sample;

— test temperature;

— the work of the impact (impact toughness, if required definition) of each of the tested samples and the arithmetic mean of the results of the test;

— the designation of this standard;

— the date of the test.

Annex a (mandatory). INTERNATIONAL STANDARD ISO 5754−78

APPENDIX A
(required)

SINTERED METAL MATERIALS, EXCLUDING HARDMETALS

The sample without a cut for testing the impact load

Sintered metal materials, excluding hardmetals

Unnotched impact test piece

A. 1 Purpose

This standard specifies the dimensions of the specimen without incision of sintered metal materials for testing the impact load.

Sample for test is directly obtained by pressing and sintering or by machining sintered parts.

A. 2 Scope

This standard applies to all sintered materials, excluding hardmetals. However, for some materials (e.g. materials with small porosity or materials with high plasticity) is more acceptable to use for the test sample with a notch that allows you to obtain test results with less variation (GOST 9454).

Note — For sintered porous materials is not always possible to obtain very accurate results of testing the impact load, so they should not be compared with the test results of dense metals.

A. 3 References

GOST 9454−78 Metals. Test method for impact strength at low, room and elevated temperatures

A. 4 the Size of sample for test

The size of the sample for test is shown in figure A. 1 and table A. 1.

Figure A. 1 — sample Size for testing the impact strength

Figure A. 1 — sample Size for testing the impact strength

Table A. 1

In millimeters

Sample for test tag so that you can identify the direction of pressing.

Testing the impact load is carried out according to GOST 9454 on the test Koper Sharpie.

The direction of the shock load should be perpendicular to the direction of pressing, unless specified in another direction.

APPENDIX B (mandatory). MARKING OF WORK IMPACT AND TOUGHNESS SPECIMEN WITHOUT INCISION

APPENDIX B
(required)

For samples without incision follows the marks of their work impact or toughness to specify Superscript test temperature, and then the numerical value of the work of impact or toughness.

Examples:

50 — kick 50 j, determined at a temperature of minus 40 °C;

150 — impact strength of 150 j/cm, determined at a temperature of 100 °C.