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    188宝金博页面版: 【精品】Effects of Mo and Al Additions on the Sulfidation Behavior of 310 Stainless Steel

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    内容提示： Oxidation of Metals, Vol. 50, Nos. 1/2, 1998Effects of Mo and Al Additions on the Sul?dationBehavior of 310 Stainless SteelW. Kai,* C. J. Leu,* and Y. J. Wu*Received July 30, 1997; revised November 5, 1997The high-temperature sul?dation behavior of 310 stainless steel (310SS) withMo and Al additions (up to 10 at.%) was studied over the temperature range700±900 ° C in pure-sulfur vapor over the range of 10 -3to 10 -1atm. The cor-rosion kinetics followed the parabolic rate law in all cases and the sul?d...

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    Oxidation of Metals, Vol. 50, Nos. 1/2, 1998Effects of Mo and Al Additions on the Sul®dationBehavior of 310 Stainless SteelW. Kai,* C. J. Leu,* and Y. J. Wu*Received July 30, 1997; revised November 5, 1997The high-temperature sul®dation behavior of 310 stainless steel (310SS) withMo and Al additions (up to 10 at.%) was studied over the temperature range700±900 ° C in pure-sulfur vapor over the range of 10 -3to 10 -1atm. The cor-rosion kinetics followed the parabolic rate law in all cases and the sul®dationrates increased with increasing temperature and sulfur pressure. The sul®d-ation rates decreased with increasing Mo and Al contents and it was foundthat the addition of 10 at.% Mo resulted in the most pronounced reductionamong the alloys studied. The scales formed on 310SS with Mo additionswere complex, consisting of an outer layer of iron sul®de (with dissolved Cr),(Fe, Ni) 9 S 8 , and Cr 2 S 3 /Cr 3 S 4 (with dissolved Fe), and an inner heterophasiclayer of Fe 1 2 x S, Cr 2 S 3 /Cr 3 S 4 , NiCr 2 S 4 , Fe 1.25 Mo 6 S 7.7 , FeMo 2 S 4 , and MoS 2 .The scales formed on 310SS with Mo and Al additions had a similar mixtureas above, except that Al 0.55 Mo 2 S 4 was also observed in the inner layer. Theformation of MoS 2 and Al 0.55 Mo 2 S 4 partly blocked the transport of cationsthrough the inner scale, resulting in the reduction of the sul®dation rates com-pared to 310SS.KEY WORDS: sul®dation; 310SS, Mo; Al; Fe 1.25 Mo 6 S 7.7 ; FeMo 2 S 4 ; MoS 2 ; Al 0.55 Mo 2 S 4 .INTRODUCTIONStainless Steel (310SS) is one of the best heat-resistant structural steels usedin high-temperature oxidizing environments. Because it forms a dense, pro-tective chromia layer, 310SS can be used in most parts of municipal inciner-ators if the corrosion environment is mild. However, severe attack by*Institute of Materials Engineering, National Taiwan Ocean University, Keelung 202, Taiwan,Republic of China.890030-770X y 98 y 0800-0123$15.00 y 0 Ó 1998 Plenum Publishing Corporation

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