Synergistic Effects of Co on Nanoscale Dual-Precipitation in 2.3 GPa-Grade Steel
Aijun Li, Jiaxin Liu, Yangxin Wang, Chundong Hu
TL;DR
This paper introduces a new high-strength steel with cobalt that enhances nanoscale precipitation for improved strength.
Contribution
The novel contribution is the discovery of cobalt's synergistic effect on nanoscale precipitation in steel, enhancing strength.
Findings
Adding Co suppresses atomic diffusion in steel, affecting precipitation nucleation and growth.
Co induces uniform distribution of precipitation phases and inhibits their coarsening.
Nanoscale NiAl and M2C precipitations under Co's effect significantly increase steel strength.
Abstract
A novel ultrahigh-strength steel with Co and strengthened through nanoscale precipitation was developed. We found that the Co element had a synergistic effect on the precipitation process. The simulation results indicate that adding Co to steel can suppress the tracer diffusion coefficients of all the elements in the steel, hindering the atomic self-diffusion rate and long-range diffusion effect. A decrease in the atomic diffusion rate of precipitations will affect the nucleation, distribution, and growth of precipitations. The Atom probe tomography (APT) results indicate that the Co element not only dispersed uniformly in the matrix itself but also induced the uniform distribution of the precipitation phases. During the nucleation process of the precipitation, the rejected Co atoms formed small regions of high Co concentrations around the precipitation, inhibiting the coarsening of the…
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Taxonomy
TopicsMicrostructure and Mechanical Properties of Steels · Advanced Materials Characterization Techniques · Hydrogen embrittlement and corrosion behaviors in metals