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

Ultrahigh carbon steels with superplastic properties are produced by heating a steel containing ferrite and carbide phases to a soaking temperature approximately 50 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. 9 figs.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
100986
Assignee:
Univ. of California, Oakland, CA (United States) PTO; SCA: 360101; PA: EDB-95:129941; SN: 95001445705
Patent Number(s):
US 5,445,685/A/
Application Number:
PAN: 8-034,430
Contract Number:
W-7405-ENG-48
Resource Relation:
Other Information: PBD: 29 Aug 1995
Research Org:
University of California
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON STEELS; FABRICATION; PLASTICITY; PHASE STUDIES; MICROSTRUCTURE; TRANSITION TEMPERATURE