ISSN:
1573-4889
Keywords:
TiAl
;
INTERMETALLICS
;
HOT-CORROSION
;
MELTS
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The hot-corrosion behavior of Ti-50Al,Ti-48Al-2Cr-2Nb, and Ti-50Al10Cr alloys was investigatedin (Na, K)2SO4 andNa2SO4 + NaCl melts. TiAlintermetallics showed much better hot-corrosionresistance in (Na, K)2SO4 at900°C than the Ni-base superalloy K38G. Two types ofcorrosion products formed on Ti-50Al: some areas werecovered with a continuous Al2O3 scale, whereas otherareas formed a mixed Al2O3 +TiO2 scale; TiS existed at the scale-alloyinterface. A mixed Al2O3 +TiO2 scale formed on Ti-48Al-2Cr 2Nb, and nosulfide was found beneath the scale. An adherentAl2O3 scale, however, formed onTi-50Al-10Cr, which provided excellent hot-corrosionresistance. All three alloys suffered severe hotcorrosion in Na2SO4 + NaCl meltsat 850°C. A mixed Al2O3 +TiO2 scale formed on all three alloys andmany voids and pits existed in the scale-alloy interface. Thehot-corrosion mechanisms are discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1018818622547
Permalink
