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Title: Transformation process for production of ultrahigh carbon steels and new alloys

Abstract

Ultrahigh carbon steels with superplastic properties are produced by heating a steel containing ferrite and carbide phases to a soaking temperature approximately 50.degree. C. above the A.sub.1 transformation temperature, soaking the steel above the A.sub.1 temperature for a sufficient time that the major portion of the carbides dissolve into the austenite matrix, and then cooling the steel in a controlled manner within predetermined limits of cooling rate or transformation temperature, to obtain a steel having substantially spheroidal carbides. New alloy compositions contain aluminum and solute additions which promote the formation of a fine grain size and improve the resistance of the carbides to coarsening at the forming temperature.

Inventors:
 [1];  [2];  [3];  [2]
  1. (Pleasanton, CA)
  2. (Livermore, CA)
  3. (Palo Alto, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
870047
Patent Number(s):
5445685
Assignee:
Regents of University of California (Oakland, CA) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
transformation; process; production; ultrahigh; carbon; steels; alloys; superplastic; properties; produced; heating; steel; containing; ferrite; carbide; phases; soaking; temperature; approximately; 50; degree; sufficient; time; major; portion; carbides; dissolve; austenite; matrix; cooling; controlled; manner; predetermined; limits; rate; obtain; substantially; spheroidal; alloy; compositions; contain; aluminum; solute; additions; promote; formation; fine; grain; size; improve; resistance; coarsening; forming; cooling rate; alloy composition; grain size; major portion; sufficient time; carbon steel; controlled manner; carbon steels; predetermined limits; fine grain; alloy compositions; compositions contain; ultrahigh carbon; formation process; carbide phases; /148/

Citation Formats

Strum, Michael J., Goldberg, Alfred, Sherby, Oleg D., and Landingham, Richard L. Transformation process for production of ultrahigh carbon steels and new alloys. United States: N. p., 1995. Web.
Strum, Michael J., Goldberg, Alfred, Sherby, Oleg D., & Landingham, Richard L. Transformation process for production of ultrahigh carbon steels and new alloys. United States.
Strum, Michael J., Goldberg, Alfred, Sherby, Oleg D., and Landingham, Richard L. Sun . "Transformation process for production of ultrahigh carbon steels and new alloys". United States. https://www.osti.gov/servlets/purl/870047.
@article{osti_870047,
title = {Transformation process for production of ultrahigh carbon steels and new alloys},
author = {Strum, Michael J. and Goldberg, Alfred and Sherby, Oleg D. and Landingham, Richard L.},
abstractNote = {Ultrahigh carbon steels with superplastic properties are produced by heating a steel containing ferrite and carbide phases to a soaking temperature approximately 50.degree. C. above the A.sub.1 transformation temperature, soaking the steel above the A.sub.1 temperature for a sufficient time that the major portion of the carbides dissolve into the austenite matrix, and then cooling the steel in a controlled manner within predetermined limits of cooling rate or transformation temperature, to obtain a steel having substantially spheroidal carbides. New alloy compositions contain aluminum and solute additions which promote the formation of a fine grain size and improve the resistance of the carbides to coarsening at the forming temperature.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {1}
}

Patent:

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