Strengthening mechanism of Cu-Ni-bearing low-carbon low-alloyed steel under induction quenching treatment

doi:10.13251/j.issn.0254-6051.2023.04.033

Abstract

Abstract: Microstructure and the relationship between Cu particles and strength of the Cu-Ni-bearing low-carbon low-alloyed steel under induction-heat quenching and aging was analyzed by means of electron back-scatter diffraction(EBSD), scanning electron microscope(SEM), X-ray diffractometer(XRD) and in-situ tension in transmission electron microscope(TEM), and the quantitative analysis of strengthening mechanism was discussed. The results show that the comprehensive properties of the tested steel after induction quenching at 980 ℃ and aging at 670 ℃ is better than that induction quenching at 1030 ℃ and aging at 680 ℃.There are many strengthening mechanisms for the Cu-Ni-bearing low-carbon low-alloyed steel, including precipitation strengthening, grain size strengthening, forest dislocations strengthening, solid solution strengthening and lattice friction stress, among which precipitation strengthening and grain size strengthening are the main strengthening method, accounting for more than 70%. In theoretical calculation, the minimum critical size of Cu particles is 28.50 nm in Orowan mechanism, and the dislocation pile-up around the Cu particles, and they interact with a Cu particle with size of 44.57 nm according to the bypass mechanism during in-situ tension in TEM.

Key words: Cu-Ni-bearing steel, induction quenching, Cu particle, strengthening mechanism

CLC Number:

TG142.33

Sun Mingxuan, Meng Li, Zhang Ning, Zhang Bo, Liang Fengrui, Luo Xiaobing. Strengthening mechanism of Cu-Ni-bearing low-carbon low-alloyed steel under induction quenching treatment[J]. Heat Treatment of Metals, 2023, 48(4): 204-210.

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