Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 05, 2021 - September 08, 2021
This paper reports a study on the effect and mechanism of a method to refine grains on the surface layer of steel plates by burnishing and subsequent heat treatment. In this method, plastic strain is applied to the surface layer by the burnishing, and the accumulated plastic strain energy works as the driving force of the static recrystallization in the subsequent heat treatment. It is shown that the plastic strain is effective for the formation of fine recrystallized grains. A physical mode of the burnishing and static recrystallization process is proposed, and effects of burnishing condition on the size of recrystallized grains are discussed. It is shown that refinement of the average grains size is limited even though the burnishing load and burnishing time are increased. In addition, a method to apply strong shear strain by burnishing is proposed to achieve further grain refinement.
