Determination and analysis of CCT curves of R4 (22MnCrNiMo) steel for mooring chain

doi:10.13251/j.issn.0254-6051.2020.03.041

Abstract

Abstract:

The expansion curve of R4 (22MnCrNiMo) steel was measured by DIL805A thermal expansion instrument. CCT curves of the steel were drawn by metallographic and hardness test. The effects of different cooling rates on microstructure transformation of the steel were studied. The results show that the critical transition point of R4 (22MnCrNiMo) steel is: Ar₃=819.5 ℃, Ar₁=778.5 ℃. When the cooling rate is in the range of 0.1-0.5 ℃/s, the microstructure obtained by cooling is mainly lower bainite+retained austenite+small amount of martensite structure, only a small amount of lower bainite structure is obtained when the cooling rate reaches 3 ℃/s, as the cooling rate further increases, the microstructure is lath-like, needle-shaped martensite+residual austenite structure.

Key words: R4 (22MnCrNiMo) steel, CCT curves, phase transformation, microstructure

CLC Number:

TG115.21

Fang Guangjin. Determination and analysis of CCT curves of R4 (22MnCrNiMo) steel for mooring chain[J]. HTM, 2020, 45(3): 208-210.

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