Abstract
Liquid phase sintering of stainless steel is usually applied to
improve corrosion resistance by obtaining a material without an
open pore system. The dense structure normally also give a higher
strength when compared to conventional sintered steel. Liquid
phase sintrering based on addition of boride to AISI 316L type
steels have previously been studied, but were found to be
sensitive to intergranular corrosion due to formation of
intermetallic phases rich in chromium and molybdenum. In order to
improve this system further, new investigations have focused on
the use of higher alloyed stainless steel as base material. The
stainless base powders were added different amounts and types of
boride and sintered in hydrogen at different temperatures and
times in a laboratory furnace. During sintering the outlet gas was
analyzed and subsequently related to the obtained microstructure.
Thermodynamic calculations, made by use of the computer programme
Thermo-Calc, were also correlated with the observed
microstructure. Corrosion measurements by electrochemical
techniques show no signs of intergranular corrosion in contrast to
the case of AISI 316L based steel. Furthermore most of the
material showed excellent corosion resistance in the neutral salt
spray by withstanding more than 1500 hours exposure without any
corrosion, either on as-sintered surfaces or worked samples.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of Joint Nordic Conference in Powder Technology |
| Number of pages | 1 |
| Place of Publication | Copenhagen |
| Publication date | 1996 |
| Publication status | Published - 1996 |
| Event | Joint Nordic Conference in Powder Technology - Copenhagen, Denmark Duration: 13 Nov 1996 → 14 Nov 1996 |
Conference
| Conference | Joint Nordic Conference in Powder Technology |
|---|---|
| Country/Territory | Denmark |
| City | Copenhagen |
| Period | 13/11/1996 → 14/11/1996 |