Grain Refinement of Metal Surface Using Hot Shot Peening.

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  • 熱間ショットピーニング加工を用いた金属表面の結晶粒微細化
  • ネツカン ショットピーニング カコウ オ モチイタ キンゾク ヒョウメン ノ ケッショウリュウ ビサイカ

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Abstract

A method for refining grains near the surfaces of metal workpieces using hot shot peening is proposed to improve the surface properties of the workpiece. In this method, the grains are refined due to plastic deformation generated by the hit of many shots under hot working conditions. A model experiment using two shots is carried out to examine the effects of the amount of deformation, the processing temperature and the interval of the hit on the grain size. In the experiment, the workpieces are stainless steel SUS304, carbon steel S25C, mild steel and commercially pure copper. By means of peening with many shots, the global surface layer successfully attains to the fine grains.

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