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ROLLING CONTACT FATIGUE AND WEAR OF CrL AND CrM MODE POWDER METALLURGY STEELS

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Author(s): Dušan Rodziňák | Dáša Jakubéczyová | Vladimír Zahradníček | Pavol Hvizdoš

Journal: Materials Engineering
ISSN 1335-0803

Volume: 17;
Issue: 1;
Start page: 23;
Date: 2010;
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Keywords: Contact fatigue | Pulver metallurgy | Wear | Microstructure | TEM studies

ABSTRACT
Contact fatigue properties of sintered steels type CrM and CrL with addition of 0,3-0,7 %C were examined on the device type „pin on disc“ and confronted with wear tests on the same principle. Achieved outcomes are better for CrM material; the higher carbon content the better they are. Fatigue strength ranges from 925 - 1410 MPa and is consistent with the value of hardness. Dry wear tests show that the wear is dependent on the hardness of carbide particles (microhardness) and not on macrohardness of material. These causes wear of indentor. Between values obtained from tests of contact fatigue and wear testing is not possible to find relevant compliance. Both rupture mechanisms are based on breaches of other principles, particularly the PM materials are in the mode of wear that is not sufficiently explored.
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