High Nitrogen Sintered Stainless Steel Produced by Pressureless Sintering of Nitrogen Containing Powders Mixture

摘要

Nitrogen alloying has been shown as an effective way to improve properties of stainless steels. Powder metallurgy is a good route to introduce nitrogen and produce high nitrogen (close to the solubility limit) stainless steels. The paper presents and discusses the nitriding behavior of nickel-free stainless steel produced by powder metallurgy route. Alloyed melt was atomized by nitrogen and in this way nitrogen was introduced to the powder. Further nitriding occurred during sintering in a nitrogen atmosphere. For comparison, compacts having the same composition as the alloyed powder were produced from elemental powder mixture. Sintering-nitriding behavior of investigated materials was controlled by dilatometry, chemical and X-Ray phase analysis and optical microscopy.