Process for Making Superplastic Steel Powder and Flakes.
Field 26 Mar 96, patented 1 Dec 98
OFFICE OF THE SECRETARY OF THE NAVY WASHINGTON DC
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In a process for making superplastic steel powder or flakes, molten steel is rapidly solidified to form a solidified material comprising substantially single-phase austenitic steel powder or flakes having a grain size of no greater than about 2 micrometers. The powder or flakes are heated at a temperature of 300 deg C. to 600 deg C. to produce superplastic steel comprising a mixture of ferrite steel and at least one metal carbide, the ferrite steel having a randomly oriented structure and having a train size of no greater than about 2 micrometers, the at least one metal carbide having a grain size no greater than about 0.5 micrometers. The steel powder or flake is then recovered for further processing. A consolidated superplastic steel can be formed from the powder or flake by hot pressing the powder or flake at a temperature of between about 650 deg C. and about 950 deg C. and at a pressure of about 10 MPa to about 100 MPa for a time sufficient to form a fully dense consolidate.POWDER METALLURGY, SUPERPLASTICITY, HOT PRESSING, DEFORMATION, FLOW RATE,FLAKES, FERRITES.
- Metallurgy and Metallography
- Manufacturing and Industrial Engineering and Control of Production Systems