The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 08, 1977
Filed:
Jan. 19, 1976
Per Ingvar Hellman, Soderfors, SW;
Bo Gunnar Klang, Oxelosund, SW;
Stora Kopparbergs Bergslags Aktiebolag, Falun, SW;
Abstract
The invention relates to a cutting tool containing 25-33 percent by weight of Co and certain amounts of W, Mo, C, B, Zr, Si, Mn, Cr, Ni and Fe containing normal contaminants, W + 2Mo being equal to 20-40 percent by weight, the structure of the tool consisting of a martensitic matrix having a grain size of 5-70 .mu.m, determined as austenite grain size, containing 5-15 percent by volume of an intracrystalline, very homogeneously distributed fine-disperse phase consisting of an intermetallic compound of Fe, Co, W and/or Mo and, between the grains of the base mass, 20-30 percent by volume of a primarily precipitated phase mainly consisting of the same intermetallic compound but having a predominant grain size of 1-2 .mu.m. The invention also relates to a process of preparing such a tool by finely dividing a melt of the composition given and cooling in a non-oxidizing atmosphere to a fine powder, hot-compacting the powder to an ingot, hot-working the ingot to a blank which is allowed to cool and is possibly soft annealed, forming the blank to a tool by reductive machining, solution annealing the tool by heating to the austenitizing temperature, cooling and tempering at least once.