Estimation of phase transformation behaviour and high-temperature properties in SUS410 using visualization techniques

Abstract

Visualization of the microstructure formation process in SUS410 was considered combining the confocal scanning laser microscope (CSLM) and the multi-phase field method (MPFM). According to the in situ observation using CSLM, γ-phase precipitation temperature falls greatly with an increase in cooling rate. Moreover, solidification and solid-state transformation behaviour was analysed by MPFM. Calculated tensile strength depending on the phase state corresponds to experimental results. It is thought that tensile strength and density in the high-temperature region are affected by the cooling rate due to the delay of γ-phase formation.

Keywords::

• stainless steel
• solidification
• δ/γ transformation
• multi-phase field method
• confocal scanning laser microscope
• tensile strength