Effect of thermocyclic processing on the kinetics of isothermal austenite transformation and the properties of powdered 40N2M steel

The effect of thermocyclic treatment (TCT) on the mechanical properties and kinetics of isothermal transformation of supercooled austenite was studied using hot stamped 40N2M steel powder with a density of 7780 kg/m exp 3 with the following chemical composition: 0.39-0.41% C; 1.9-2.1% Ni; and 0.2-0....

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Bibliographic Details
Published in:Powder metallurgy and metal ceramics 1993-06, Vol.32 (6), p.505-508
Main Authors: Gurevich, Yu. G., Ivashko, A. G., Rakhmanov, V. I., Pan'shin, I. F.
Format: Article
Language:English
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Summary:The effect of thermocyclic treatment (TCT) on the mechanical properties and kinetics of isothermal transformation of supercooled austenite was studied using hot stamped 40N2M steel powder with a density of 7780 kg/m exp 3 with the following chemical composition: 0.39-0.41% C; 1.9-2.1% Ni; and 0.2-0.3% Mo. Test samples consisted of sorbite with a small amount (approx20%) of martensite. Subsequent homogenizing annealing at 1373K improved the uniformity of the chemical composition and structure of the steel (after annealing a ferrite-pearlite steel). Isothermal cooling was conducted in a tin melt and in air. A study was made of the transformation from austenite to martensite and bainsite as a result of isothermal holding and cooling. Isothermal quenching with preliminary thermocycling results in ultrafine bainite or bainite-martensite structure, and, therefore, higher mechanical properties, in comparison to the standard isothermal treatment.
ISSN:1068-1302
1573-9066
DOI:10.1007/BF00560729