Method of Making High Strength Ferrous Article, and Article Made Thereby
a high-strength, ferrous article technology, applied in the field of articles, can solve the problems of compromising the elongation properties of martensite structures, difficult preparation of steels having significant bainite phases, and in particular a lower bainite phase, and presenting significant hazards in high temperature baths
Inactive Publication Date: 2008-03-06
NOBLE ADVANCED TECH
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Benefits of technology
"The patent describes a method for making a ferrous alloy with a high percentage of a desired metallic phase. The method involves heating the alloy and then contacting it with a quenching medium to maintain it at a temperature above the formation temperature of the desired phase. The workpiece is then cooled to ambient temperature. The method can be used to form bainite phases and can be implemented using resistance heating or a forming operation. The invention can be used to make articles with desirable metallurgical phases."
Problems solved by technology
However, such martensite structures are compromised in elongation properties (typically 4-6%).
While bainite steels are advantageous in many applications, the preparation of steels having a significant bainite phase, and in particular a lower bainite phase, is difficult.
These high temperature baths present significant hazards, consume relatively large amounts of energy, and occupy relatively large areas.
Method used
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[0010] The present invention is a metallurgical process which greatly simplifies the formation of bainite, or other desirable metallurgical phases, containing articles by decoupling the function of the quench medium from that of the hold medium heretofore employed. As such, the present invention eliminates the need to utilize large, high temperature, liquid baths for holding articles at an elevated temperature during the formation of the desired phase.
[0011] The present invention relies upon a combination of input heat and a quench medium to dynamically balance the temperature of a workpiece so as to effectively hold that workpiece at an elevated temperature sufficient to promote the formation of a bainite or other desired phase.
[0012] In a typical process of the present invention, a workpiece comprised of a ferrous alloy is first heated to a temperature above its austenizing temperature. This heating may be accomplished by any means known in the art. For example, heating may be c...
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Abstract
A preselected metallurgical phase is formed in a body of a ferrous alloy by heating the workpiece to a temperature above an austenizing temperature of the alloy and thereafter contacting the workpiece with a quenching medium. Heat is input to the workpiece during at least a portion of the time it is in contact with the quenching medium. The quenching medium and / or the source of heat are regulated so that they work in combination to maintain the workpiece at a holding temperature which is above the temperature at which the martensite phase forms in the alloy. After maintaining the alloy at the holding temperature for a predetermined period of time, it is cooled to ambient. In particular implementations, the system operates to form a bainite phase in the alloy. Also disclosed are systems for implementing the method.
Description
RELATED APPLICATIONS [0001] This application is a continuation-in-part of U.S. patent application Ser. No. ______ filed Sep. 15, 2005, entitled “Method of Making High Strength Bainite Article, and Article Made Thereby.” This application also claims priority of U.S. Provisional Patent Application Ser. No. 60 / 610,720 filed Sep. 17, 2004, entitled “Metal Forming Process with Resistance Heating.”FIELD OF THE INVENTION [0002] This invention relates generally to the fabrication of articles from ferrous metals having controlled metallurgical properties. More specifically, the invention relates to the fabrication of articles from ferrous alloys having high concentrations of a bainite phase. Most specifically, the invention relates to the fabrication of structural members for motor vehicles, and other articles of manufacture, fabricated from high strength steel having a high concentration of a bainite phase. BACKGROUND OF THE INVENTION [0003] Ultra high strength steel is used to fabricate va...
Claims
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IPC IPC(8): C21D1/40C21D1/62C21D6/00
CPCC21D1/56C21D2211/002C21D11/005C21D1/20
Inventor MACHROWICZ, TADLANDINO, BRANDON
Owner NOBLE ADVANCED TECH