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Showing papers on "Maraging steel published in 1988"


Patent
04 Jan 1988
TL;DR: In this paper, a process for producing spherically shaped maraging steel powder particles containing a readily oxidizable metal is described, which consists of forming an aqueous solution containing the metal values of iron, cobalt, nickel and molybdenum, in a predetermined ratio, forming a reducible solid material from the solution reducing the solid material to form metallic poweder particles.
Abstract: A process for producing spherically shaped maraging steel powder particles containing a readily oxidizable metal comprises forming an aqueous solution containing the metal values of iron, cobalt, nickel and molybdenum, in a predetermined ratio, forming a reducible solid material from the solution reducing the solid material to form metallic poweder particles. These particles are agglomerated with a predetermined amount of a second group consisting of at least one readily oxidizable metal selected from the group consisting of aluminum, titanium and vanadium. The agglomerates are entrained in a carrier gas and fed into a high temperature zone and droplets are formed. The droplets are cooled to form essentially spherical shaped particles of a maraging steel alloy containing at least one readily oxidizable metal.

15 citations


Patent
04 Jan 1988
TL;DR: In this article, a process for forming maraging steel alloys is described, which consists of forming an aqueous solution containing the metal values of iron, cobalt, nickel and molybdenum in a predetermined ratio, forming the reducible solid material from the solution, reducing the solid material to form metallic powder particles.
Abstract: A process for forming maraging steel alloys comprise forming an aqueous solution containing the metal values of iron, cobalt, nickel and molybdenum in a predetermined ratio, forming the reducible solid material from the solution, reducing the solid material to form metallic powder particles. These particles are entrained in a carrier gas and fed into a high temperature zone to form droplets. The droplets are cooled to form essentially spherical particles which are agglomerated with a predetermined amount of at least one readily oxidizable metal selected from the group consisting of aluminum, titanium and vanadium. The agglomerates are entrained in a carrier gas and fed into a high temperature zone to form droplets which are thereafter cooled to form essentially spherical shaped particles of a maraging steel alloy containing at least one readily oxidizable metal.

13 citations


Patent
29 Dec 1988
TL;DR: Amaraging steel powder is a process comprising of forming an aqueous solution of iron, cobalt, nickel and molybdenum metals values in a predetermined ratio, forming a reducible solid material from the solution reducing the solid material to metallic powder particles, entraining at least a portion of the powder particle in a carrier gas which is fed into a high temperature zone to form droplets therefrom, and cooling said droplets to form essentially spherical shaped maraging steel alloy particles.
Abstract: A process comprising by producing maraging steel powder comprises forming an aqueous solution of iron, cobalt, nickel and molybdenum metals values in a predetermined ratio, forming a reducible solid material from the solution reducing the solid material to metallic powder particles, entraining at least a portion of the powder particle in a carrier gas which is fed into a high temperature zone to form droplets therefrom, and cooling said droplets to form essentially spherical shaped maraging steel alloy particles

9 citations


Patent
04 Jan 1988
TL;DR: In this article, a process for producing a blend of maraging steel alloys and an oxidizable metal comprises forming an aqueous solution or iron, cobalt, nickel and molybdenum in a predetermined ratio.
Abstract: A process for producing a blend of maraging steel alloys and an oxidizable metal comprises forming an aqueous solution or iron, cobalt, nickel and molybdenum in a predetermined ratio. Thereafter, a reducible solid material containing the metals is produced from the solution. The solid material is reduced to metallic powder particles which are entrained in a carrier gas and fed into a high temperature zone to form droplets which are cooled to form essentially spherical shaped metal alloy particles. These particles are combined with a predetermined amount of at least one easily oxidizable metal selected from the group consisting of aluminum, titanium and vanadium to form a relative uniform blend of the spherical shaped particles and the readily oxidizable metal.

5 citations



Journal ArticleDOI
TL;DR: In this article, a static tensile test on notched specimens of a maraging steel was conducted to predict the final fracture of maraging steels and the results showed that the crack propagation period occupies only 20-30% of total life in high-cycle fatigue and also the crack lengths at final fracture in low-cycled fatigue are very small in comparison with specimen size.
Abstract: High-cycle fatigue tests, low-cycle fatigue tests, and static tensile tests on notched specimens of a maraging steel were conducted. not only is the fatigue fracture toughness Kfc approximately constant for high-cycle and low-cycle fatigue, regardless of applied stresses and strains, but also Kfc is approximately equal to the static fracture toughness KIC;Kfc KIC 36 MPa·m1/2. Moreover, for its high tensile strength (yield stress σ0.2=2440 MPa, tensile stress σB=2490 MPa), the maraging steel has an extremely small value of KIC in comparison with other low-and medium-strength steels. Considering that the crack propagation period occupies only 20-30% of total life in high-cycle fatigue and also that the crack lengths at final fracture in low-cycle fatigue are very small in comparison with specimen size, the fatigue life prediction method on the basis of the integral of crack growth rate equation is inadequate and should not be applied to high-strength steels such as maraging steels. Instead, Kfc will be useful to predict the final fracture of maraging steels.

3 citations



Patent
05 Dec 1988
TL;DR: A bimetallic strip or band for manufacturing metal saw blades and metal band saw bands includes a support strip and a tool steel top layer, which is martensitically hardenable maraging steel having a maximum carbon concentration of 0.05 wt. % and a content of alloying elements of at least 10 wt %.
Abstract: A bimetallic strip or band for manufacturing metal saw blades and metal band saw bands includes a support strip and a tool steel top layer. The top layer is high speed tool steel. The support strip is martensitically hardenable maraging steel having a maximum carbon concentration of 0.05 wt. % and a content of alloying elements of at least 10 wt. %.

3 citations


Patent
17 Jun 1988
TL;DR: In this article, a maraging steel having excellent mirror finishing was obtained by specifying the comps of steel contg. Ti and in which the content of C, S, N and O to combine with Ti is restricted.
Abstract: PURPOSE:To obtain a maraging steel having excellent mirror finishing, by specifying the comps. of steel contg. Ti and in which the content of C, S, N and O to combine with Ti is restricted. CONSTITUTION:The maraging steel contains, by weight, <=0.0020% C, <=0.05% Si, <=0.05% Mn, <=0.005% P, <=0.0020% S, 3-13% Ni, 0.1-2.0% Ti, 9-15% Cr, <=0.0020% N and <=0.0020% O, satisfies the conditional formula of C+S+N+O<=0.0050, and further contains at need one or more kinds from Co+Mo or Al among 5-16% Co, 2-10% Mo and 0.04-0.4% Al, and the balance consists of Fe with inevitable impurities. Said steel has the excellent mirror finishing and is suitable for a material such as a metallic mold for injection molding.

2 citations


Patent
23 Mar 1988
TL;DR: In this paper, the authors proposed a method to improve the machinability of maraging steel stock and reduce the rate of dimensional shrinkage by final aging by subjecting the stock to desired mechanical working in a preaged state and carrying out final aging.
Abstract: PURPOSE:To improve the machinability of maraging steel stock and to reduce the rate of dimensional shrinkage by final aging by subjecting the stock to desired mechanical working in a preaged state and carrying out final aging CONSTITUTION:Maraging steel stock is subjected to soln heat treatment and preaged at a lower temp then the conventional aging temp It is subjected to desired mechanical working in the preaged state and then final aging is carried out Since the stock is mechanically worked in the preaged state, the desired mechanical working can be easily carried out The rate of dimensional shrinkage by the final aging can be remarkably reduced as compared with that by the conventional single aging

1 citations


Patent
17 Jun 1988
TL;DR: In this paper, the compsn. of a steel which contains Ti and is limited in the content of C, S, N, and O is specified, which is the material which has the excellent mirror finishing property and is adequate as molds for injection molding of plastic, etc.
Abstract: PURPOSE:To obtain a maraging steel having excellent mirror finishing property, by specifying the compsn. of a steel which contains Ti and is limited in the content of C, S, N, and O. CONSTITUTION:This maraging steel contains =1 kinds of Co+Mo or Al among 5-16% Co, 2-10% Mo, and 0.04-0.4% Al, and consists of the balance Fe and inevitable impurities. This steel is the material which has the excellent mirror finishing property and is adequate as molds for injection molding of plastic, etc. The above- mentioned steel is obtd. by subjecting the steel to prerefining and dephosphorizing in an electric furnace or the like, then to vacuum oxygen decarburizing and vacuum refining.