| 摘要 |
PROBLEM TO BE SOLVED: To form a reforming layer to a desired depth from the surface of a steel material and to simply perform this formation at a low cost. SOLUTION: A rotating tool T rotating at high speed is brought into contact with the surface of the steel material W and then, the contact part of the steel material W with the rotating tool T is softened with frictional heat and this softened part is stirred with a probe 2 to reform the steel material W. Since this rotating tool T is composed of a heat-resistant cemented carbide mainly composed of a tungsten carbide, wear hardly occurs, even in the temperature zone of≥1,000°C where the steel material W is softened. The depth of the reforming layer 3 can be made a desired depth by changing the length of the probe 2 projectingly arranged on the rotating tool T. Further, when performing this treatment in a state the rotating tool T is inclined to the back part in the advancing direction, since a fluid f2 vertically stirring the softened steel material, is generated with the inclined probe 2, stirring with the fluid is more effectively performed. COPYRIGHT: (C)2008,JPO&INPIT
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