It has been demonstrated that in thin quenched-steel targets irradiated with a high-energy, high-current electron beam of moderate power density, in parallel with the near-surface microhardness maximum formed by a thermal mechanism (quenching from high temperatures), two other maxima appear. One of them is situated in the zone of reflection of the stress wave from the rear surface of the target. Since the material in this zone is not heated, it is hardened by a strain-stress-wave mechanism. Another maximum is situated in the zone of reflection of the stress wave from the target face. The steel structure in this zone is modified by a combined mechanism, such that the material is hardened by the stress wave and simultaneously tempered by the operative temperature field. It has been shown that the positions of the microhardness maxima can be calculated with a reasonable accuracy by solving numerically a set of thermoelasticity equations. The structure of the material at the microhardness maxima located in the zones of reflection of the stress wave has been examined by way of electron microscopy.
|Number of pages||12|
|Journal||Materials and Manufacturing Processes|
|Publication status||Published - Mar 1999|
ASJC Scopus subject areas
- Industrial and Manufacturing Engineering
- Materials Science(all)