| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.18 ( May 1988 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Properties of High Compressibility Composite-Type Alloy Steel Powders, "KIP SIGMALOY" Kuniaki Ogura, Teruyoshi Abe, Yukio Makiishi, Shigeaki Takajo, Toshiyuki Minegishi, Eiji Hatsugai |
|
Synopsis : Composite-type alloy steel powders, KIP SIGMALOY, have been developed for the production of high density and heavy duty structural parts. The powders are characterized by metallurgically bonding fine particles of alloying elements on the surfaces of soft iron particles, and satisfy both compressibility at compaction and alloy diffusivity during sintering. SIGMALOY Cu powders, which contain 2 to 20% Cu as an alloying element, suppress "copper growth" during sintering and hence improve sintered strength by 10% and dimensional accuracy by 30%, when compared with conventional powder mixes. SIGMAROY 215, 315 and 415 powders with compositions 2 to 4% Ni-1.5%Cu-0.3 to 0.5% Mo attain compressibility equal to or higher the than that of pure iron powders and improve the homogeneity of sintered specimens, resulting in over 10% higher strength and toughness than those of sintered powder mixes. |
| TextiPDF: 7p./390kbj |