Effects of copper on proeutectoid cementite precipitation |
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| Authors: | J. A. Wasynczuk R. M. Fisher G. Thomas |
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| Affiliation: | (1) Department of Materials Science and Mineral Engineering, University of California, 94720 Berkeley, CA;(2) Materials and Molecular Research Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, 94720 Berkeley, CA;(3) Center for Advanced Materials, Lawrence Berkeley Laboratory, 1 Cyclotron Road, 94720 Berkeley, CA;(4) Department of Materials Science and Mineral Engineering, University of California, 94720 Berkeley, CA;(5) Materials and Molecular Research Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, 94720 Berkeley, CA |
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| Abstract: | The effect of copper on proeutectoid cementite precipitation was investigated by examining the isothermal transformation characteristics
of Fe-C and Fe-C-Cu alloys that had comparable carbon contents. The TTT diagrams generated for the Fe-1.43 wt pct C and the
Fe-1.49 wt pct C-4.90 wt pct Cu alloys showed that the kinetics of proeutectoid cementite precipitation were not significantly
affected by copper. The morphology of the proeutectoid cementite, as seen in the optical microscope, was also substantially
the same in both alloys. However, transmission electron microscopy revealed the presence of small epsilon-copper precipitates
within the proeutectoid cementite of the copper containing steel. It was concluded that this precipitation of ε-Cu took place
at the cementite : austenite interphase boundaries, and that the transport of copper to the precipitates was accomplished
by interphase boundary diffusion. The small influence of copper on the kinetics of proeutectoid cementite precipitation is
discussed in terms of diffusional growth theories and the structure of the cementite : austenite interphase boundary. |
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