Effect of Mn on Solubility of Ti-sulfide and Ti-carbosulfide in Ultra-low C Steels

摘要

To clarify the thermodynamic stability of Ti_4C_2S_2 and TiS in ULC Ti-added IF steels, extraction by potentio-static electrolysis method and chemical analysis were conducted with ULC Ti-added IF steels containing various amounts of Mn and heated at various temperatures. As the results, the solubilities of Ti_4C_2S_2 and TiS increased with an increase in Mn content. Ti_4C_2S_2 was more stable than TiS between 950 and 1 250℃. Following solubility products were obtained.rnlog[Ti] · [C]~(0.5)· [S]~(0.5)=0.392-7004/T-(4.783-7401/T) • [Mn]rnlog[Ti]~(2/3)·[S] = -0.021 -5847/T-(3.360-5 195/7)·[Mn]