Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1983-03-07
1985-06-18
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148 36, C21D 118
Patent
active
045239657
ABSTRACT:
A method for hardening high carbon steel is described for achieving fully austenitized martensite steel without microcracking. Steel is heated to the full austenitizing temperature of the selected steel composition for fully dissolving the carbon phase. The austenitized steel is quenched in an intermediate quenching step to a temperature below the martenite start temperature for the selected steel composition to initiate transformation of only a minor portion of the austenite structure to martensite. The martensite so formed is tempered in an intermediate tempering step to a temperature above the intermediate quench temperature for imparting toughness to the minor portion of martensite formed in the intermediate quenching step. In a final quenching step the remaining austenite is transformed to martensite so that the steel as finally quenched comprises a major portion of untempered martensite generally of smaller crystal size intermixed with a minor portion of tough tempered martensite of larger crystal size. In a final tempering step the martensite can be transformed to a finely dispersed mixture of carbide precipitate in ferrite without microcracks and with a carbon content that would ordinarily cause microcracking according to conventional hardening methods.
REFERENCES:
patent: 3337376 (1967-08-01), Grange
Board of Trustees of the University of Maine
Dean R.
Kane, Jr. Daniel H.
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