HIC-resistant
Trace-Mg treatment refines, softens, and spheroidizes non-metallic inclusions, forming core-shell structures that trap hydrogen and reduce diffusible hydrogen, markedly improving hydrogen-induced cracking resistance in high-strength acid-resistant submarine pipeline steels.
Qiyun, Wen · Huang, Feng · Xiao, Hu · Xu, Yunfeng · Hu, Qian · Liu, Jing
International Journal of Hydrogen Energy 2023
Steel treated with 4 ppm Mg exhibits the lowest HIC susceptibility
Inclusions are markedly refined, softened, spheroidized, and dispersed after trace-Mg treatment
Modified 'core-shell' inclusions possess larger critical size for HIC initiation and higher saturated hydrogen concentration