Shenzhen Su's heat treatment is discussed effect of intercritical quenching on Microstructure and properties of steel 10Ni5CrMo results.
(1) the same modulation thermal traditional treatment, 10Ni5CrMo steel after QLT treatment, improve the stability of tempering, the yield strength ratio of steel is reduced, especially the low temperature toughness increased, this structure provides a new way to improve the strength and toughness of steel for the modulation type of traditional welding.
(2) after the treatment of QLT steel strip test two times tempering martensite + Fe mixed organization body, and in the plate and strip precipitated within the island, a strip of reverted austenite. Reverted austenite matrix obeys the K-S relationship.
(3) with the tempering temperature height, increasing the amount of reverted austenite, up to 8.17wt%. At the same time reverted austenite is a nickel rich manganese, nickel content was 9.47wt%, the manganese content was 1.05wt%.
(4) precipitation of reverted austenite can improve the low temperature toughness. But in steel reverted austenite in low temperature is not stable, only stable at low temperature of reverted austenite on low temperature toughness has contribution, stable existence of reverted austenite amount is maximum, the low temperature toughness of the steel is the best.