Fig. 1. Cross-section microstructure of FeCrAl (a) and FeCrAlY (b) alloy cladding

Fig. 2. Burst strength of FeCrAl and FeCrAlY alloy cladding at different temperatures

Fig. 3. Macromorphology of FeCrAl and FeCrAlY alloy cladding after internal pressure burst test at different temperature(a,b,c,d,e) FeCrAl RT, 350 ℃, 600 ℃, 800 ℃ and 1 000 ℃, (f,g,h,i,j) FeCrAlY RT, 350 ℃, 600 ℃, 800 ℃ and 1 000 ℃

Fig. 4. Rupture opening micromorphology of FeCrAl and FeCrAlY alloy cladding at different temperature(a,b) FeCrAl RT, 350 ℃, (c,d) FeCrAlY RT, 350 ℃

Fig. 5. Oxidation increment curves of FeCrAl and FeCrAlY alloy cladding after stream oxidation at different temperatures for 8 h

Fig. 6. XRD analysis of oxidation products of FeCrAl (a) and FeCrAlY (b) alloy cladding after stream oxidation at different temperatures for 8 h

Fig. 7. Macrostructure of FeCrAl and FeCrAlY alloy cladding after stream oxidation at different temperatures for 8 h (color online) (a, b, c, d) FeCrAl original sample, 800 ℃, 1 000 ℃ and 1 200 ℃, (e, f, g, h) FeCrAlY original sample, 800 ℃, 1 000 ℃ and 1 200 ℃

Fig. 8. Morphology of surface oxide films of FeCrAl alloy cladding after stream oxidation at 800 ℃, 1 000 ℃ and 1 200 ℃ for 8 h (a,b,c), amplification diagram of oxide films in region A, B, C and D (d,e,h,g), 1 000 ℃ and 1 200 ℃ cross-section oxide films morphology (h,i)

Fig. 9. EDS analysis of surface oxide films of FeCrAl alloy cladding after stream oxidation at different temperatures for 8 h (a) Original sample, (b) 800 ℃, (c) 1 000 ℃, (d) 1 200 ℃

Fig. 10. Morphology of surface oxide films of FeCrAl alloy cladding after stream oxidation at 800 ℃, 1 000 ℃ and 1 200 ℃ for 8 h (a,b,c), amplification diagram of oxide films in region E, F and G (d,e,f), 800 ℃, 1 000 ℃ and 1 200 ℃ cross-section oxide films morphology (g,h,i)

Fig. 11. EDS analysis of surface oxide films of FeCrAlY alloy cladding after stream oxidation at different temperatures for 8 h (a) Original sample, (b) 800 ℃, (c) 1 000 ℃, (d) 1 200 ℃