Effect of Ni, Mo and Mn content on spinodal decomposition kinetics and G-phase precipitation of aged model cast austenitic stainless steels

During ageing, the ferritic phase of Cast Austenitic Stainless Steels (CASS) undergoes decomposition by spinodal decomposition and G-phase precipitation, which leads to increasing hardness and decreasing impact toughness. Mo-bearing steels are more prone to ageing than Mo-free steels. To study the effects of Ni, Mo, and Mn, duplex model alloys were thermally aged at 350 degrees C and 400 degrees C. The microstructure evolution during ageing was characterized by atom probe tomography. Only Ni additions seem to affect the spinodal decomposition kinetics. Ni accelerates the spinodal decomposition kinetics regardless of the presence of Mo or Mn. Additions of Mo and Mn promote the precipitation of G-phase. (c) 2021 Elsevier B.V. All rights reserved.

Automated summary

During ageing, the ferritic phase of Cast Austenitic Stainless Steels undergoes decomposition by spinodal decomposition and G-phase precipitation. The addition of Ni affects the spinodal decomposition kinetics, while Mo and Mn additions promote the precipitation of G-phase in the microstructure evolution.