Effect of holding time on carbide dissolution and bainite transformation of bearing steel

doi:10.13251/j.issn.0254-6051.2023.11.030

Abstract

Abstract: Size and volume fraction of carbides in the GCr15 bearing steel at 860 ℃ for different holding time in two-phase region were studied by means of scanning electron microscope, Nano Measure 1.2 and Image J image software. The hardness was measured using a Vickers microhardness tester. And the bainitic transformation in bearing steel treated under different two-phase region holding time and different bainitic isothermal time was analyzed using DIL thermal expansion instrument and scanning electron microscope. The results show that at 860 ℃, the longer the holding time in two-phase region, the more carbides are dissolved, the greater the increase in hardness, and the size and volume fraction of carbides are significantly reduced. As the holding time in the two-phase region increases, the more carbides dissolve, the more stable and uniform C/Cr content in austenite becomes, and the bainite transformation incubation period extends. The optimal holding time in two-phase region is 30 min. The longer the bainitic isothermal treatment time, the greater the proportion of bainite transformation.

Key words: holding time, bearing steel, carbides, bainite transformation

CLC Number:

TG156

Wu Bingbing, Wang Qingxiang, Liu Xiaoming, Xing Yunxiang, Xu Rongchang, Li Hui. Effect of holding time on carbide dissolution and bainite transformation of bearing steel[J]. Heat Treatment of Metals, 2023, 48(11): 191-195.

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