Abstract
Microstructure control for joining advanced stainless steel SAF2507 is carried out on weld simulations. The toughness of the bond region in the heat affected zone (HAZ) of SAF2507 stainless steel is much lower than that of the base metal. In order to improve the toughness of the bond region, microstructure control by varying cooling time from 1673 Kelvin (K) to 1073 K is carried out. The ferrite grain size increased with increasing cooling time from 1673K to 1473K (Δt16-14). The amount of austenite increased with increasing the cooling time from 1473K to 1073K (Δt14-10). When the cooling time of (Δt16-14) is below 29 seconds, the absorbed energy is kept almost constant because of the combination effect of ferrite grain growth and austenite reformation. When the cooling time becomes longer the absorbed energy decreased. The equations describing the change of microstructure in the bond region is also presented in this chapter.
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