ISO 5949:1983

Name: ISO 5949:1983 — Tool steels and bearing steels — Micrographic method for assessing the distribution of carbides using reference photomicrographs
SKU: ISO 5949:1983
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Tool steels and bearing steels — Micrographic method for assessing the distribution of carbides using reference photomicrographs

Название (английский):

ISO 5949:1983

Tool steels and bearing steels — Micrographic method for assessing the distribution of carbides using reference photomicrographs

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 1 декабря 1983 г.
Издание:: ISO IS 5949 edition 1 version 1
ICS:: 77.040.99

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Описание (английский):

Specifies a method for assessing steels with C levels between 0,1 % and 1,5 % and a total content of alloy elements less than or equal to 5 %. The use of this method for other steels shall be subject to special agreement. Contains principles, sampling, preparation of samples, assessment of the distribution of carbides, expression of results and test report. An annex gives reference photomicrographs.

Abstract

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Упомянутые в описании и другие стандарты ISO

Overview

ISO 5949:1983 specifies a micrographic method for assessing the distribution of carbides in tool steels and bearing steels. It applies to steels with carbon between 0.1% and 1.5% and a total content of alloying elements ≤ 5%. The method uses a set of reference photomicrographs (annex) to grade carbide distribution by visual comparison and defines sampling, sample preparation, observation, assessment, result expression and test reporting. Use for other steels requires special agreement.

Key topics and technical requirements

Reference photomicrographs: Series of 10 images (numbered 0–9) representing increasing carbide levels; images grouped into four series by morphology and condition: NA, NH, LE, LD.

NA: carbide network in the annealed condition
NH: carbide network in the quenched and tempered condition
LE: enclosed carbide streaking (distinct lines)
LD: diffused carbide streaking

Field sizes and magnifications:

Series NA: 0.08 mm field at ×1000
Series NH: 0.4 mm field at ×200
Series LE & LD: 0.8 mm field at ×100
Slight magnification variation acceptable; the visual field diameter must match the series used.

Sampling:

Samples from rounds, bars and flats; polished area ~100 mm².
Surface examined should coincide with the direction of greatest elongation (longitudinal) or transverse section where appropriate.
Sampling method and number of samples to be specified in product standard or agreed between parties.

Sample preparation and etching:

Polishing per metallographic techniques; electrolytic polishing only by agreement.
Etchants: picral for NA (and optionally NH); nital for NH, LE, LD (picral may also be used).

Assessment & expression of results:

Compare each visual field to photomicrographs; record the matching photomicrograph number.
Characteristic number = series symbol + photomicrograph number.
Results can be expressed as an average (NA & NH) or as the characteristic number for the predominant worst field (LE & LD).

Test report must include steel grade, sampling details/position, number of fields examined (NA/NH), heat treatment conditions, and results.

Applications and users

ISO 5949 is practical for:

Metallurgists and microstructural analysts assessing carbide distribution

Quality engineers in tool steel and bearing steel production

Materials testing laboratories performing acceptance testing

Toolmakers, bearing manufacturers and heat-treat shops verifying microstructural quality

The method supports quality control, process validation (heat treatment and rolling), failure analysis and material specification compliance.

ISO 5949:1983

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

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