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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 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:
Research Org.:
University of California
OSTI Identifier:
100986
Patent Number(s):
5,445,685
Application Number:
PAN: 8-034,430
Assignee:
Univ. of California, Oakland, CA (United States)
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 29 Aug 1995
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON STEELS; FABRICATION; PLASTICITY; PHASE STUDIES; MICROSTRUCTURE; TRANSITION TEMPERATURE

Citation Formats

Strum, M J, Goldberg, A, Sherby, O D, and Landingham, R L. Transformation process for production of ultrahigh carbon steels and new alloys. United States: N. p., 1995. Web.
Strum, M J, Goldberg, A, Sherby, O D, & Landingham, R L. Transformation process for production of ultrahigh carbon steels and new alloys. United States.
Strum, M J, Goldberg, A, Sherby, O D, and Landingham, R L. Tue . "Transformation process for production of ultrahigh carbon steels and new alloys". United States.
@article{osti_100986,
title = {Transformation process for production of ultrahigh carbon steels and new alloys},
author = {Strum, M J and Goldberg, A and Sherby, O D and Landingham, R 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 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {8}
}