Abstract
-
In order to study the plastic deformation characteristics of the brittle high-Cr white cast
iron in upsetting process, and find out the mechanism for improving the formability of the
cast iron within the laminated composite, the hot forging process of monolithic high-Cr
white cast iron and high-Cr white cast iron/low carbon steel laminate is simulated by
means of hot compression tests using Gleeble 3500 thermo mechanical simulator and
professional plastic forming software DEFORM-3D. The results reveal that during hot
compression process, the monolithic cast iron suffered severe barreling and cracking,
whereas the cast iron layer within the laminate underwent large plastic deformation with
barreling-free and crack-free. Such a significant improvement can be attributed to the
simultaneous deformation of the cast iron together with the low carbon steel claddings,
which is beneficial to relieving the stress in the cast iron and changing its deformation
mode. Under the triaxial compressive stress state, the brittle high-Cr white cast iron within
the laminate can flow like a ductile material at high temperatures and low strain rates.