Microstructure and properties of gravity sintered 316l stainless steel powder with nickel boride addition

• Published in: Science of sintering Vol. 48; no. 3; pp. 293 - 302
• Main Authors: Bozic, Dusan, Vilotijevic, Miroljub, Ruzic, Jovana, Jovanovic, Uros, Stasic, Jelena
• Format: Journal Article
• Language: English
• Published: Beograd International Institute for the Science of Sintering (IISS) 01.09.2016; International Institute for the Science of Sintering, Beograd
• Subjects: Austenitic stainless steels; Borides; Gravitation; gravity sintering; Heat resistant steels; mechanical and physical properties; microstructure; NiB additive; Powder metallurgy; Scanning electron microscopy; Sintering (powder metallurgy); stainless steel filters; Stainless steels
• ISSN: 0350-820X; 1820-7413
• DOI: 10.2298/SOS1603293B

The present work demonstrates a procedure for synthesis of stainless steel powder by gravity sintering method. As an additive to the basic powder, NiB powder was added in the amount of 0.2 - 1.0 wt.%. Gravity sintering was done in vacuum, at the temperatures of 1100?C-1250?C, in the course of 3 - 60 min, using ceramic mould. Structural characterization was conducted by XRD, and microstructural analysis by optical and scanning electron microscope (SEM). Mechanical properties were investigated by tensile tests with steel rings. Density and permeability were determined by standard techniques for porous samples. Gravity sintered stainless steel with NiB addition had more superior mechanical and physico-chemical properties compared to stainless steel obtained by standard powder metallurgy procedures - pressing and sintering.