Analysis of the Effects of Al on the Ductile-to-Brittle Transition Behavior of Ferritic Heat-Resistant Stainless Steels

The effect of Al content on the microstructure and ductile-brittle transition temperature (DBTT) of 18Cr–Al–Si ferritic heat-resistant stainless steel have been studied by Charpy impact testing over temperatures ranging from 20 to 90 ℃. Charpy impact test results show that DBTT increased with increasing Al content. Meanwhile, fracture morphology changed with increasing Al content, where the amount of dimples decreased and cleavage facets...