Effects of cooling rate and Nb microalloying on microstructure and  hardness of 25MnV non-quenched and tempered steel

doi:10.13251/j.issn.0254-6051.2024.08.005

Abstract

Abstract: Effect of cooling rate on microstructure and hardness of two non-quenched and tempered forged steels microalloyed with V and V-Nb was studied by single compression test carried out on a Gleeble-3800 thermal simulator. The results show that the cooling rate has a significant effect on the microstructure and hardness of the tested steels. Under the condition of continuous cooling, with the increase of cooling rate in the range of 0.1-0.5 ℃/s, the ferrite content decreases, the pearlite content increases, and the microstructure is refined. With the increase of cooling rate in the range of 1-3 ℃/s, the microstructure is further refined, and bainite transformation begins to occur, which promotes the increase of hardness. The addition of Nb element generates large-size (V, Nb)(C, N) precipitated particles, which further refines the grains by pinning the grain boundary and inducing the formation of intragranular ferrite. At the same time, the solute drag effect of Nb atom on C atom reduces the content of pearlite in the V-Nb steel. The higher hardness(218-242 HV) of the V steel in the cooling rate range of 0.1-0.5 ℃/s is due to its higher content of pearlite, and the higher hardness(256-291 HV) of the V-Nb steel within the cooling rate range of 1-3 ℃/s is due to the refinement of the microstructure and higher bainite content.

Key words: non-quenched and tempered steel, Nb microalloying, cooling rate, microstructure, hardness

CLC Number:

TG142.1

Liu Yunna, Sun Lican, Dai Guanwen, Liu Xianda, Song Renbo, Zhang Chaolei. Effects of cooling rate and Nb microalloying on microstructure and hardness of 25MnV non-quenched and tempered steel[J]. Heat Treatment of Metals, 2024, 49(8): 31-35.

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Effects of cooling rate and Nb microalloying on microstructure and hardness of 25MnV non-quenched and tempered steel

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