Abstracts Book - IMRC 2018

• SE5-O022
THEORETICAL AND PRACTICAL DETERMINATION OF A BINARY
MIXTURE OF METALLIC POWDERS OF 316 STAINLESS STEEL WITH
TWO SIZES OF PARTICLE, FOR POWDER METALLURGY PROCESS
Luz Adriana Cañas Mendoza 1,2 , Yaneth Pineda Triana 1 , Jose G. Chacon Nava 3
1 Universidad Pedagógica y Tecnológica de Colombia, Facultad de Ingeniería, Colombia.
2 Universidad Tecnológica de Pereira, Facultad de Tecnología, Colombia. 3 Centro de
Investigación en Materiales Avanzados, S.C., Departamento de Metalurgia e Integridad
Estructural, Mexico.
The powder metallurgical steels have less resistance to the corrosion that
wrought counterparts, because its behavior is affected simultaneously by such
parameters like: the interconnected porosity, the morphology of its pores and,
in case of the austenitic stainless steels, the interaction with the sintering
atmosphere used during the production process which can favor the
sensitization of the material.
This work presents the theoretical methodology for the calculation of the ideal
composition of a mixture the conditions for a maximum packing of spheres of
two sizes (assuming a spherical shape factor for the particles) according to the
development published for Brouwers for a binary mixture system; the author
presents the existing relation between the different combinations of two sizes
of particles and the fraction of empty between the same ones when they are
packed.
Together with the theoretical determination of the mixture, the density and
porosity measured in the synthesis of a 316 powder metallurgical stainless steel
made prealloyed powders of two average particle sizes (45 μm and 150 μm) are
presented; the powders were combined in different proportions to define the
appropriate combination for the performance of the material properties such
as density, porosity and corrosion rate.
The results obtained confirm that the theoretical calculation is a good
alternative to formulate metallurgical powder alloys, because a good packing of
the particles is achieved, which has a favorable effect on the characteristics of
the finished product.
BROUWERS H. J. H. Particle-size distribution and packing fraction of geometric
random packings. En: PHYSICAL REVIEW, 2006, Vol. 74, p. 1-4.