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:
Jan. 08, 2019
Filed:
Jul. 02, 2010
Laurent Ferrer, Lieusaint, FR;
Laurent Ferrer, Lieusaint, FR;
SAFRAN AIRCRAFT ENGINES, Paris, FR;
Abstract
The invention relates to a method for producing martensitic steel that comprises a content of other metals such that the steel can be hardened by an intermetallic compound and carbide precipitation, with an Al content of between 0.4% and 3%, comprising the following steps: The temperature Tis substantially lower than the martensitic transformation temperature Mf, and the time t during which said steel is kept in said cryogenic medium at a temperature Tfrom the moment when the hottest part of the steel reaches a temperature lower than the martensitic transformation temperature Mf is at least equal to a non-zero time t, the temperature T(in ° C.) and the time t(in hours) being linked by the equation T=ƒ(t), the first derivative of the function ƒ relative to t, ƒ'(t), being positive, and the second derivative of ƒ relative to t, ƒ″(t), being negative.