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Vol. 31 No. 61 (2022)
July-September 2022 (Continuous Publication)

Papers

Theoretical and Practical Determination of a Binary Mixture of AISI 316 Steel Powders to Increase Corrosion Resistance in Powder Metallurgical Parts

https://doi.org/10.19053/01211129.v31.n61.2022.14417

Published 2022-09-06

Luz-Adriana Cañas-Mendoza
Universidad Tecnológica de Pereira

Yaneth Pineda-Triana
Universidad Pedagógica y Tecnológica de Colombia

Enrique Vera-López
Universidad Pedagógica y Tecnológica de Colombia

Abstract

Powder metallurgical steels have lower corrosion resistance compared to wrought steels. Their behavior is simultaneously affected by interconnected porosity, pore morphology, interaction with sintering atmospheres, and metallurgical phenomena such as steel 'sensitization'. This work presents the theoretical methodology to calculate the optimum composition of the mixture and the conditions for a maximum packing of two sizes spheres (assuming a spherical shape factor) according to the development published by Brouwers for a system of binary mixtures. For the theoretical determination of the mixture, the results of density and porosity of a 316 powder metallurgical stainless steel made from prealloyed powders of two average granulometries (45μm and 150μm) are presented. The powders were combined in different proportions to define the appropriate quantities that allow the manufacture of steel with a low corrosion rate. The obtained results confirm that the theoretical calculation is a reliable alternative to formulate powder metallurgical alloys since good particle packing is achieved, which has a favorable effect on the characteristics of the finished product.

Keywords

Powder metallurgy, sintered porosity, sintered density, austenitic stainless steels, corrosion rate

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Author Biography

Luz-Adriana Cañas-Mendoza

Roles: Investigation; Validation; Formal Analysis; Writing – original draft.

Yaneth Pineda-Triana

Roles: Investigation; Validation; Formal Analysis; Writing – review & editing.

Enrique Vera-López

Roles: Investigation; Validation; Formal Analysis; Writing – review & editing.

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