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Vol.36, No.2, 235 ~ 242, 1998
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| Title |
| Surface Hardening of Gray Cast Iron for Automotive Cylinder Block Using High-Energy Electron Beam Irradiation (1) ( Thermal Analysis Using Thermal Simulation and Heat -Transfer Modeling ) |
| 추동훈 , 이성학 , 구양모 , 최성무 Seong Hun Choo , Sung Hak Lee , Yang Mo Koo , Sung Mu Choi |
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| Abstract |
| Thermal analyses of the surface layer of a gray cast iron irradiated with high-energy electron beam have been studied. In order to investigate the complex microstructures which were composed of plate martensite, retained austenite, ledeburite, and flake graphite, the thermal analysis using a heat-transfer model and the simulation test including thermal cycles of abrupt heating and quenching were carried out. The results indicated that the irradiated surface was heated up to the austenite temperature region and then quenched to room temperature, which was enough to obtain surface hardening through martensitic transformation. When the surface temperature reached the melting temperature, the ledeburite eutectic structure was formed. The thermal analysis data matched well with the microstructures of the thermally simulated specimens, confirming that the thermal analysis is quite useful for the microstructural analysis of the surface layers irradiated with high-energy electron beam. |
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