STEEL CONTAINING FILM TYPE RETAINED AUSTENITE
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United States of America Patent
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Dec 28, 2017
app pub date -
Jun 27, 2017
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Jun 27, 2016
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Abstract
The present invention relates to a steel having a microstructure composed of bainite and retained austenite, wherein the area ratio of the retained austenite 10% or more, and the retained austenite is composed of a film type retained austenite whose length is more than 3 times the width and a block type retained austenite whose length is less than 3 times the width, and wherein the area of the film type retained austenite is 60% or more of the total area of the retained austenite. The steel of the present invention can exhibit excellent strength and elongation.
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