Effect of normalizing temperature on microstructure and low temperature toughness of 355 MPa heavy section steel for marine engineering

doi:10.13251/j.issn.0254-6051.2021.06.021

Abstract

Abstract: Normalizing experiment was carried out on hot-rolled H-beam steel with yield strength of 355 MPa. Microstructure of the tested steel in hot rolled state and normalized at 890 and 920 ℃ was observed by means of optical microscope and scanning electron microscope, respectively. The impact properties of the tested steel in different states were compared and analyzed, and the correlation between microstructure and impact toughness was obtained. The experimental results show that with the increase of normalizing temperature, the abnormal microstructure such as widmanstatten decreases and disappears at last. Meanwhile, the segregation phenomenon in different positions of the flange thickness direction of the tested steel is effectively reduced. The pearlite lamellar spacing becomes smaller and the overall grain is refined. Compared with the original microstructure, the normalized microstructure uniformity in the core and edge is significantly improved. The low temperature impact property at -40 ℃ is significantly improved, and the impact absorbed energy difference between the core and edge is reduced, which is consistent with the change of microstructure.

Key words: normalizing treatment, heavy section steel, microstructure, segregation, impact property

CLC Number:

TG142.7

Zhao Peilin, Liu Chao, Wu Huiliang, Zheng Li. Effect of normalizing temperature on microstructure and low temperature toughness of 355 MPa heavy section steel for marine engineering[J]. Heat Treatment of Metals, 2021, 46(6): 102-106.

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