Modification of Sintered 316L Stainless Steel by Addition of Calcium Pyrophosphate
The paper concerns the problem of exploitative composite materials with solid lubrication additions. The goal of the present investigation was to research the composite materials based on 316L stainless steel powders with the addition of calcium pyrophosphate (Ca2P2O7). The diffusion processes of main elements during sintering were analyzed. The influence of volume fraction of additions on structure of composites and their tribological properties were examined. Tribological tests were performed by a special tribometer, which allowed to realize research during the periodically variable motion with low velocity and variable values of pressure. The structure of materials was observed with scanning electron microscope (SEM). The intensive diffusion of main alloying elements brought the segregation of components and appearance of new phases. Changes in the microstructure, particularly the solution of phosphorus in austenite and attendance of phosphides and oxides insertions, had an effect on mechanical properties of materials. The microhardness, yield strength values as well as wear resistance increased considerably with the rise of modifier addition.
Andreas Öchsner, Graeme E. Murch and Ali Shokuhfar
M. Grądzka-Dahlke "Modification of Sintered 316L Stainless Steel by Addition of Calcium Pyrophosphate", Defect and Diffusion Forum, Vols. 283-286, pp. 291-296, 2009