Microstructural Study of the Surface Layers Irradiated by High-Energy Electron Beam in a Plain Carbon Steel
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An investigation was conducted into the microstructural analyses of the surface layer hardened by the irradiation of high-energy electron beam in a 0.38%C plain carbon steel. Steel specimens were irradiated using an 1.4 MeV electron accelerator, and the microstructures of the irradiated surface layers were examined. The ferrite-pearlite structure near the specimen surface was changed to the dual-phase structure, <I>i.e.</I>, ferrite and martensite upon irradiation. In order to investigate this martensitic transformation mechanism, the simulation test including thermal cycles of abrupt heating and quenching was carried out. The results indicated that the temperature of the irradiated surface layer was raised to about 1100 °C and then quenched to room temperature, which was enough to obtain the surface hardening through the transformation to martensite. The surface irradiation effect on hardness was also analyzed by the irradiation condition such as beam moving speed and heat input.
- MATERIALS TRANSACTIONS
MATERIALS TRANSACTIONS 37(3), 309-313, 1996-03
The Japan Institute of Metals