Effects of Weld Heat Input on Microstructures of Coarse Grain Heat-Affected Zone of Bearing-Nb HF Steel Plate

Yi Sheng Zhao; Xin Ming Zhang

doi:10.4028/www.scientific.net/AMM.437.582

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 437Effects of Weld Heat Input on Microstructures of...

Effects of Weld Heat Input on Microstructures of Coarse Grain Heat-Affected Zone of Bearing-Nb HF Steel Plate

Abstract:

Effects of weld heat input on microstructures of coarse grain heat-affected zone (CGHAZ) were taken into account for bearing-Nb HF steel plate. For weld heat input from 12 to 20KJ/cm, grain boundary ferrite, degenerate pearlite and acicular ferrite are produced for steel plate with the Si/Mn ratio of 0.26. For higher input, bainite phase is found at the center of specimens. However, for the steel with the Si/Mn ratio of 6.2, granular bainite is dominant at weld heat input from 12 to 20KJ/cm. For further improving the weld heat input to 24KJ/cm, bainite nucleation at prior austenite grain boundaries is suppressed in the considered steel. Nb addition has obvious influences on microstructure.

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Periodical:

Applied Mechanics and Materials (Volume 437)

Pages:

582-585

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.437.582

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Online since:

October 2013

Authors:

Yi Sheng Zhao*, Xin Ming Zhang

Keywords:

Coarse Grain Heat-Affected Zone, HF Steel, Microstructure, Niobium, Toughness

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