Enhanced mechanical properties of nano/meso hybrid structure materials produced by hot roll sintering process

Abstract

SUS316L stainless steel and commercially pure titanium powders are processed by Mechanical Milling (MM) which is one of Severe Plastic Deformation (SPD) process. These MM powders are sintered by Hot Roll Sintering (HRS) process. Microstructure of materials produced by HRS process consists of a shell and core hybrid microstructure, that is, a shell structure with nano grains and a core structure with workhardened coarse grains. All of the HRS materials demonstrate not only superior strength but also good elongation. The mechanical properties are strongly influenced by the shell/core microstructure. The nano/meso hybrid microstructure by HRS process has been proved to be very effective to improve mechanical properties. © 2008 The Japan Institute of Metals.