Continuous cooling transformation curve of the third generation aviation bearing steel CSS-42L

doi:10.13251/j.issn.0254-6051.2024.12.029

Abstract

Abstract: Critical point and the continuous cooling transformation test of the third generation aviation bearing steel CSS-42L at cooling rate of 0.02-40 ℃/s were carried out by DIL805A quenching dilatometer with dilatometric method. The static CCT curve was drawn, and the microstructure and Vickers hardness at room temperature were analyzed. The results show that the critical points Ac₁ and Ac₃ of the CSS-42L steel are 655 ℃ and 738 ℃, respectively. In the process of continuous cooling, only martensitic transformation occurs at different cooling rates, and the starting temperature of martensitic transformation decreases with the decrease of cooling rate. The tested CSS-42L steel has a maximum microhardness of 330 HV50 at the cooling rate of 1.6 ℃/s.

Key words: CSS-42L bearing steel, critical point, continuous cooling transformation, microhardness

CLC Number:

TG142.1

Tian Zhongjie, Zhang Yunfei, Cao Wenquan, Zhao Yingli, Wang Yan, Bai Lijuan, Cui Yi. Continuous cooling transformation curve of the third generation aviation bearing steel CSS-42L[J]. Heat Treatment of Metals, 2024, 49(12): 175-178.

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