Effect of cooling rate on microstructure and properties of LY225 low yield point steel

doi:10.13251/j.issn.0254-6051.2023.11.036

Abstract

Abstract: Effect of different cooling rate on microstructure, tensile property, impact property and fatigue performance of the LY225 low yield point steel was studied by hot rolling trials. The results show that, at the low cooling rate (1 ℃/s), the grain size is coarse and the pearlite lamellar spacing is larger with a large amount of free cementite continuously distributed along the grain boundary, leading to poor toughness and fatigue performance. At the medium cooling rate (10 ℃/s) and high cooling rate (20 ℃/s), the grains are refined and the pearlite lamellar spacing is decreased with much less dispersedly distributed free cementite, showing much improved strength, toughness and fatigue performance. Compared to the medium cooling rate (10 ℃/s), the high cooling rate (20 ℃/s) offers a more refined microstructure, but with lower plasticity and fatigue performance.

Key words: low yield point steel, cooling rate, microstructure, impact property, fatigue performance

CLC Number:

TG142.4

Wu Fengjuan, Yang Hao, Qu Jinbo. Effect of cooling rate on microstructure and properties of LY225 low yield point steel[J]. Heat Treatment of Metals, 2023, 48(11): 225-229.

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