Effect of high temperature thermomechanical treatment on the mechanical properties of vanadium – modified AISI 4330 steel

The relationships between the recovery and recrystallization of hot deformed austenite grains and the precipitation of carbide on tempering in a 0.3C -- Ni -- Cr -- Mo -- V steel (4330) have been studied to examine closely the favorable effects of high-temp. thermomechanical treatment (HTMT) on the...

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Bibliographic Details
Published in:Journal of materials science 1981-06, Vol.16 (6), p.1557-1566
Main Authors: Lee, Jai Sung, Chun, John S.
Format: Article
Language:English
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Summary:The relationships between the recovery and recrystallization of hot deformed austenite grains and the precipitation of carbide on tempering in a 0.3C -- Ni -- Cr -- Mo -- V steel (4330) have been studied to examine closely the favorable effects of high-temp. thermomechanical treatment (HTMT) on the mechanical properties in steel. The results show that the strength and toughness increase with increasing degree of deformation by HTMT, particularly in which the ductile -- brittle transition temp. as a measure of toughness decreases steeply with increasing degree of deformation. From the analysis of line broadening on (110)M and hardness change with holding time after hot deformation, the dynamic recovery and recrystallization during HTMT are believed not to occur. Owing to this, the random distribution of fine carbide precipitates in martensite structure is hardly affected. Consequently, the improvement of mechanical properties by HTMT is due to the distribution of fine carbide precipitates within martensite lath and the refinement of the martensite structure.23 refs.--AA
ISSN:0022-2461
1573-4803
DOI:10.1007/bf02396873