B19 Temperature History and Metallographic Structure of 0.45%C Steel Processed by Frictional Stir Burnishing(Advanced machining technology)

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  • KIUCHI Satoshi
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology
  • SASAHARA Hiroyuki
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology

説明

Significant enhancement of hardness characteristics was achieved through the Frictional Stir Burnishing (FSB) process. The enhanced region was generated by the FSB process where the thickness and hardness were approximately 200 μm and 900 HV, respectively, under the conditions of a spindle speed of 10000 min^<-1>, a feed rate of 200 mm/min and a processing load of 750 N. The processing temperature was approximately 800 ℃ and dropped rapidly after the tool passed. This process can be assumed to be the same as a quenching process. However, the obtained hardness value is harder than that of the regular quenched material. When the processing load was 500 N, extremely hard regions over 1000 HV were obtained. It was confirmed that the processing temperature did not exceed the A_1 transformation point in this case. It can be concluded that the severe stirring process of FSB caused the grain refinement.

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