THE EVALUATION OF RETAINED AUSTENITE IN THE CARBURIZED LAYERS

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F16%3A86099750" target="_blank" >RIV/61989100:27360/16:86099750 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

THE EVALUATION OF RETAINED AUSTENITE IN THE CARBURIZED LAYERS

Original language description

During heat treatment of carburized steel parts, the transformation of austenite to martensite occurs and a certain amount of retained austenite remains in the hardened layers. The higher content of retained austenite in the carburized layer adversely influences hardness and frictional characteristics and increases susceptibility to fatigue damage. Furthermore, retained austenite can transform into deformation induced martensite during service, which provokes changes in properties of the carburized layers. From the technological viewpoint, the content of retained austenite is nearly always monitored but obtained results can be different depending on experimental methods. In this work, the amount of retained austenite in carburized layers of manganese-chromium steels was evaluated by image analysis method, by X-ray diffraction and also by EBSD. The largest amount of retained austenite was measured using the technique of X-ray diffraction, i.e. 28 %. The amount of retained austenite measured by image analysis of metallographic images was 13 %. However, the results of image analysis greatly depend on the metallographic preparation of samples, digital image processing and the grayscale level settings for the calculation of the retained austenite content. The lowest amount of retained austenite was determined by EBSD, i.e. 5 %. Even in this case the values depended on the method of scanned data processing. No method used to determine the amount of retained austenite in the carburized layer is universal and largely depends on the sample preparation and partial steps performed in individual measurement methods.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

JG - Metallurgy, metal materials

OECD FORD branch

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Project

<a href="/en/project/LO1203" target="_blank" >LO1203: Regional Materials Science and Technology Centre - Feasibility Program</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

METAL 2016: conference proceedings : (reviewed version) : 25th Anniversary International Conference on Metallurgy and Materials : May 25th-27th 2016, Hotel Voronez I, Brno, Czech Republic, EU

ISBN

978-80-87294-67-3

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

879-884

Publisher name

Tanger

Place of publication

Ostrava

Event location

Brno

Event date

May 25, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000391251200142