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THE QUANTITATIVE ANALYSE OF CARBIDES PHASES IN THE CRYOGENIC AND ULTRASONIC TREATED BEARINGS STEELS


GHEORGHIAN MIRELA, CIUCESCU DORU
UNIVERSITY OF BACĂU

Issue:

MOCM, Number 12, Volume III

Section:

MOCM - Volume III (2006)

Abstract:

After the heat treatments of quenching and tempering, the bear steels, being a hypereutectoid steel, presents a structure made by martensite, residual austenite and carbides. Both the martensite and the residual austenite being unstable phases, even after the final heat treatment, have the tendance to evoluate to more stable forms. The quenched tetragonal martensite evoluate to the tempered cubic martensite by separating the carbide carbone which provokes shrinkage in steel. In this article is presented the statistic method to determinate the quantuty of carbides and the comparative analyse of them by more variants of heat treatment including cryogenic quenchings after quenching, temperings at different temperatures and quenchings in ultrasonic activated media. The realized study reveals the fact that the applying of non-conventional influence sensibly the structure of the bearings steels and, implicitelly, the running properties of bearings.

Keywords:

bearings, cryogenic cooling, carbides phases, heat treatment.

Code [ID]:

MOCM200612V03S01A0019 [0000779]


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