발간논문

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Vol.17, No.6, 519 ~ 528, 1979
Title
Study for the Behavior of Carbide on Mechanical Properties in Bearing Steel
홍종미J . H . Hong, 이룡호Y . H . Lee, 허무영M . Y . Huh
Abstract
In order to study the effect of carbide behavior on mechanical properties in bearing steel, the responses of two different microstructure to subsequent heat treatment were investigated. One microstructure was a fine lamellae pearlite prepared by the isothermal transformation at the nose temperature, and the other microstructure was that of a commercial bearing steel, ie, coarse spheroidized carbide dispersed in ferrite matrix. The results obtained in this experiment were summarized as follolws. 1. The fine lamellae pearlite structure showed faster carbide dissolving rate than the spheroidized carbide in the commercial steel. 2. The fine lamellae pearlite structure resulted in finer and smallor amount of undissolved carbide in the martensite matrix than the spheroidized carbide. 3. The fine lamellae pearlite structure showed higher flow stress and work hardening exponent after subsequent austenitizing for hardening. 4. The martensite with retained austenite showed higher tensile strength than the one without it because of better ductility.
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