Influence of the Addition of Boron and the Sintering Temperature on the Mechanical Properties of P/M Austenite Type Stainless Steels

Abstract

Influence of the addition of boron and the sintering temperature on the mechanical properties, especially ductility and toughness, of P/M Austenite type stainless steels were investigated.
As a result, in order to obtain the high strength value, it was necessary to add 0.57-1.04wt.% boron to P/M steels. The tensile strength values of these specimens were 450MPa over. This reason was precipitation hardening behavior with many and fine borides without melting. In order to obtain the high ductility value, it was necessary to add 0.16-0.23wt.% boron to in P/M steels. The elongation values of these specimens were 30% over. This reason was high sintered density of austenitic matrix by the melting of minor borides. On the other hand, the high toughness value was independent of boron contents. It was necessary to obtain high sintered density of matrix because of the reduction of pore.