Effect of intercritical hardening on microstructure and fracture properties of 09MnNiDR vessel steel plate

doi:10.13251/j.issn.0254-6051.2021.04.021

Abstract

Abstract: Microstructure and low temperature impact properties of the 09MnNiDR vessel steel plate with the thickness of 60 mm were analyzed by means of metallographic microscope, scanning electron microscope and thermosdilatometer. The results show that the impact absorbed energy at 1/2 thickness of the steel plate under quenching+intercritical hardening+tempering process is greatly improved comparing with that under twice intercritical hardening+tempering process, which is related to the increase of the proportion of small and medium-sized grains in the steel. The impact fracture morphology of the former process is quasi-cleavage fracture, while that of the latter process is ductile fracture.

Key words: 09MnNiDR steel plate, intercritical hardening, bainite, grain size, impact absorbed energy

CLC Number:

TG161

Zhang Bingjun, Xie Zhanglong, Xi Lianyun, Li Zhichao, Ning Bo. Effect of intercritical hardening on microstructure and fracture properties of 09MnNiDR vessel steel plate[J]. Heat Treatment of Metals, 2021, 46(4): 122-125.

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