Affiliation:
1. Universidad Carlos III de Madrid
Abstract
The oxidation resistance at high temperature of the sintered stainless steels highly depends on their porosity and composition. In this work, 9 different powder mixes of gas atomized (ga) and water atomized (wa) particles were prepared.waferritic AISI 434L was used as base material, mixed in different amounts (5-20% by wt.) withgaaustenitic AISI 316L orgaferritic AISI 430L. All materials were vacuum sintered at two temperatures (1175 and 1225 °C). Thermogravimetric curves of the materials at 800 °C were obtained. Logarithmic curves are used to fit the experimental mass gains of PM steels. The addition ofgapowder to thewapowder reduces the kinetic constant (k) in a remarkable way. The value ofkdepends on the amount of small pores that become blocked by the oxides when the exposure at high-temperature takes place. For similar porosity values, pure ferritic alloys show slower oxidation kinetic than duplex stainless steels.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
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