On-line spheroidizing annealing process of high carbon chromium bearing steel

doi:10.13251/j.issn.0254-6051.2023.10.019

Abstract

Abstract: Quantity, size and morphology of carbides in high carbon chromium bearing steel GCr15 after different hot deformation on-line spheroidizing annealing processes were studied by using SEM, and the hardness was measured by using a micro Vickers hardness tester, and then the optimal process parameters of the on-line spheroidizing annealing process were obtained. The results show that when the final deformation temperature T is 720 ℃ and the cooling rate v is 0.05 ℃/s, the carbides with good roundness are evenly distributed in the ferrite, and both the average size and the number of carbides are large, indicating to be the optimal process parameters. In contrast, when T is 650 ℃ and v is 0.2 ℃/s, the spheroidizing effect is the worst. The proportion of spheroidization increases with the increase of T, while under the same T, the lower the v is, the longer the spheroidization time is, the larger the size of the obtained spherical carbide particles is, and the better the spheroidization effect is.

Key words: high carbon chromium bearing steel GCr15, on-line spheroidizing annealing, carbide, cooling rate

CLC Number:

TG161

Liu Xiaoming, Zhang Bo, Wu Bingbing, Sun Gangfei, Xing Yunxiang, Xu Rongchang, Li Hui. On-line spheroidizing annealing process of high carbon chromium bearing steel[J]. Heat Treatment of Metals, 2023, 48(10): 134-137.

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