Effect of Heat Treatment Process on Microstructure and Properties of High Strength Heavy Plate for Ship Hull

De Cheng Wan; Qing Wu Cai; Wei Yu; Xiao Lin Li; Chang Zheng Dong

doi:10.4028/www.scientific.net/AMR.630.59

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 630Effect of Heat Treatment Process on Microstructure...

Effect of Heat Treatment Process on Microstructure and Properties of High Strength Heavy Plate for Ship Hull

Abstract:

The variation of microstructure and their effect on the mechanical properties of heavy plate for ship hull treated by quenching in full austenite region at 910°C once or twice and tempering, or quenching in full austenite region and quenching in intercritical austenite region at 840°C again and tempering were studied with SEM and TEM. It was found that the strength and low temperature toughness of the steel were higher after double quenching in full austenite region and tempering than the steel which was quenched once and tempering, because smaller bainite inter-lath spacing, finer grains were obtained. The steel treated by intercritical quenching at 840°C after quenching in full austenite region and tempering showed the best combination of mechanical properties. This can be attributed to comprehensive effect of the uniform distribution of ferrite and bainite, stronger grain refining effect caused by formation of ferrite.

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Periodical:

Advanced Materials Research (Volume 630)

Pages:

59-63

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.630.59

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Online since:

December 2012

Authors:

De Cheng Wan, Qing Wu Cai, Wei Yu, Xiao Lin Li, Chang Zheng Dong

Keywords:

Heat Treatment, Heavy Plate, Mechanical Property, Microstructure

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