Continuous cooling transformation of a high grade reaming steel

doi:10.13251/j.issn.0254-6051.2021.06.041

Abstract

Abstract: Continuous cooling transformation curves of a high grade reaming steel were obtained by using a DIL805L thermal dilatometer combining with metallographic analysis. The results show that the microstructure of the steel with the cooling rate of 0.5-1 ℃/s is ferrite and pearlite at room temperature. Bainite appears with cooling rate exceeding 2 ℃/s, ferrite disappears with cooling rate greater than 25 ℃/s and martensite appears with cooling rate greater than 40 ℃/s. Besides, Si and Mn are cooperatively conducive to the formation of granular bainite structure. The combination of microalloy element Ti and N can refine the grains and indirectly improve the forming performance.

Key words: high grade reaming steel, microstructure, CCT curves, alloy element

CLC Number:

TG142.1

Sun Yan, An Zhiguo, Song Yue. Continuous cooling transformation of a high grade reaming steel[J]. Heat Treatment of Metals, 2021, 46(6): 209-212.

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