There is provided a metal powder for use in a selective laser sintering method for producing a three-dimensional shaped object, wherein the metal powder comprises a powder mixture of a precipitation-hardening metal composition. In particular, the metal powder of the present invention is configured to have a Fe-based component powder and a Ni-based component powder which are individually included in the powder mixture wherein a powder made of an alloy of Fe-based and Ni-based components is not included as a main powder in the powder mixture.

Metal powder for selective laser sintering, method for manufacturing three-dimensional shaped object by using the same, and three-dimensional shaped object obtained therefrom

A method of measuring the coefficient of thermal expansion of a ceramic material, including the steps of applying a glaze to a substantially densified refractory body, wherein the coefficient of thermal expansion of either the glaze or the body is known, bonding the glaze to the body, putting the glaze insufficient tension to induce crazing, measuring the average distance between cracks in the crazed glaze; and determining the unknown coefficient of thermal expansion of the glaze or body.

Method for determining the thermal expansion coefficient of ceramic bodies and glazes

The invention discloses maraging steel based on an SLM (Selective Laser Melting) molded part and a preparation method thereof. The preparation method comprises the following steps of: firstly, carrying out SLM molding on the powder of maraging steel used as a raw material to obtain the SLM molded part; then, carrying out surface treatment on the SLM molded part to obtain the compact SLM molded part; and finally carrying out solid solution treatment, aging treatment or direct aging treatment on the compact SLM molded part to obtain the maraging steel based on the SLM molded part. The SLM molded part is subjected to heat treatment by adopting the solid solution treatment, aging treatment or direct aging treatment, so that the mechanical strength and toughness of the SLM molded part are effectively improved; the range of application of the SLM molded part is expanded; the industrial design and manufacturing requirements are satisfied better; and the maraging steel based on the SLM molded part has the microhardness of 400-430HV and the tensile strength of 900-1000Mpa.

Maraging steel based on SLM (Selective Laser Melting) molded part and preparation method thereof

The invention is directed extrusion dies made from a steel for making a hot working tool, the steel consists of in weight % (wt. %): C 0.01 - 0.08 Si 0.05 - 0.6 10 Mn 0.1 - 0.8 Cr 3.9 - 6.1 Ni 1.0 - 3.0 Mo 7.0 - 9.0 Co 9.0 - 12.5 15 C u 0.2 - 6.5 N 0.01- 0.15 Balance optional elements, impurities and Fe.

Extrusion die made of hot working steel

The invention is directed to a steel for making a hot working tool, the steel consists of in weight % (wt. %):C 0.01-0.08Si 0.05-0.6Mn 0.1 -0.8Cr 3.9 - 6.1Ni 1.0 - 3.0Mo 7.0 -9.0Co 9.0-12.5Cu 0.2 -6.5N 0.01-0.15Balance optional elements, impurities and Fe.The invention is also directed to pre-alloyed powders made from said alloy and AM articles produced from said powder.

Steel suitable for hot working tools

A fully dense, powder-metallurgy produced maraging steel alloy article of prealloyed powder for use as a tool for high temperature applications. The article in the as-produced condition having a hardness less than 40 HRC to provide machinability and thereafter the article upon maraging heat treatment having a hardness greater than 45 HRC. A method for producing this article comprises compacting prealloyed powder to produce a fully dense article having a hardness less than 40 HRC and thereafter maraging heat treating to a hardness greater than 45 HRC.

Joseph F. Muha

Papers

A maraging steel article and method of manufacture