Generation of Hardened Structure on 0.45%C Steel by Frictional Stir Burnishing

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  • 炭素鋼S45Cへの摩擦攪拌形バニシング加工による硬化組織の創成

Abstract

Significant hardened structures were achieved through frictional stir burnishing (FSB) process. FSB is a process where the rotated at high revolution speed burnishing tool rubbed and stirred the thin surface layer of workpiece. FSB process also give the workpiece surface the heat caused by friction and deformation. On the low processing temperature condition, very hard region which hardness is approximately 900HV and thickness is approximately 20 μm was formed on the surface of 0.45% carbon steel. On the other hand, another type hard layer which hardness is approximately 800HV and thickness is approximately 200 μm thickness was formed with high processing temperature condition. This hardened layer also has corrosion-resistant characteristics, which cannot be etched by acid etchant. The factors of hardened the surfaces are grain refinement or martensitic transformation.

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