Refinement of austenite grain using uniform experiment design for AISI H13

Abstract

The uniform experiment design is an effective way of optimizing technology scheme for refining the grain size during multistage deformation. In this paper, it is adopted to evaluate the effect of each technology parameter on final grain size of AISI H13 hot-work tool steel during multistage deformation. It has been verified that the technology scheme for refining the final grain size can be determined rapidly and efficiently with the aid of the uniform design. The results show that the deformation parameters and the intermission time after deformation of the first stage affect the final grain size remarkably. For AISI H13 hot-work tool steel, the final grain size can be refined notably when deformation parameters for the first stage are set as follows: a deformation temperature range of 1 025–1 085 °C; a true strain of above 0.26 and the interpass time between the first and the second stage of deformation less than 10 s.

Keywords

grain refinement / deformation parameter / dynamic recrystallization / uniform design experiment