Investigation of Superplasticity in Powder White Cast Iron Alloy

White cast iron powder containing 2.875 Pct. C, l.3pct Cr was obtained by rapid solidification technology. The fully densified compact mat erial for testing has been prepared by the warm isostatic pressing (WIP) method at 720℃ for three hours with pressure of 150 MPa. The structure consisting of 1 to 3 μm in size ferrite grains and Cementite part-ides smaller than 3.5 in size was developed after WIP-uPsetting at 63 pct. strain. Superplastic behavior of the materials after WIP and WIP + upsetting were investigated in the temperature range 670-770℃ at strain rates from 3×10^-4 to 1 s^-1. At low stresses, the superplastic white cast iron exhibited a high strain rate sensitivity exponentm of 0.42 attemperature 720℃ arid ε=3.10^-3~3.10^-2S^-1, it could develop a new proc eessing routes for new industrial applications.