4.1 Article

Role of Martensite-Austenite Component of Bainitic Structure in Formation of Properties of Pipe Steel. 1. Effect of Parameters of TMT

期刊

METAL SCIENCE AND HEAT TREATMENT
卷 64, 期 1-2, 页码 71-79

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SPRINGER
DOI: 10.1007/s11041-022-00764-3

关键词

low-carbon steels; bainite; martensite-austenite structural component; microstructure; mechanical properties

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  1. [19-19-00281 RNF]

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The effect of hot rolling and controlled cooling parameters on the formation of the martensite-austenite component in bainitic and ferritic-bainitic structures of K60 pipe steel was studied. Experimental results showed that the volume fraction of the martensite-austenite component varied from 0.5% to 8% depending on the parameters of the thermomechanical treatment. The accumulated strain was found to play a dominant role in the formation of martensite-austenite particles and the determination of the acicular ferrite fraction.
The effect of parameters of hot rolling and controlled cooling on formation of the martensite-austenite component of bainitic and ferritic-bainitic structures in a pipe steel of strength class K60 is studied. The Pocket Jaw module of a Gleeble 3800 facility is used to reproduce the modes of rolling and controlled cooling of the steel. The deformed samples are subjected to an x-ray diffraction analysis. The content of untransformed austenite and martensite in the structure of the steel is determined. It is shown that the volume fraction of the martensite-austenite component varies from 0.5 to 8% depending on the studied parameters of the thermomechanical treatment. The accumulated strain is found to play the dominant role in formation of the martensite-austenite particles and to determine the fraction of acicular ferrite.

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