JFE Steel has developed a new powder metallurgical process named die-lubricated warm compaction method for producing high-density sintered parts using premixed steel powder containing only small amount of internal lubricant. In this method, a newly developed spraying equipment precisely controls the amount of lubricant applied over the die wall. The sintered and bright-quenched compacts were prepared by this method using partially alloyed steel powder, KIP SIGMALOY 415S, containing 4 mass% Ni, 1.5 mass% Cu, and 0.5 mass% Mo. They gave a density as high as 7.5 Mg/m3 and rotating bending fatigue strengths of 450 MPa and 470 MPa with carbon contents of 0.52 mass% and 0.92 mass% respectively. The density and fatigue strength were superior to those obtained by the conventional double-pressing and double-sintering method. Presumably, the fatigue strength was enhanced by increasing the carbon content because the amount of retained austenite was increased. (Engl. translation from JFE GIHO, 2004, No.4, p.70-76, (jap.))
Steel powder and die-lubricated warm compaction for automative sintered parts with high density and excellent fatigue property
Stahlpulver und das Heißpressverfahren für die gesinterten Fahrzeugteile mit hoher Dichte und mit ausgezeichneten Ermüdungseigenschaften
JFE Technical Report ; 4 ; 81-88
2004
8 Seiten, 10 Bilder, 3 Tabellen, 16 Quellen
Article (Journal)
English
Forming large automative parts of sheet steel
Tema Archive | 1973
|Tema Archive | 1985
|SLUB | 2013
|TIBKAT | 1978
|SLUB | 2013
|