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Some Specific Features of Degradation of Superheater Tubes of the Boilers of Thermal Electric Power Plants Made of 12Kh18N12T Steel

Karpenko Physicomechanical Institute Ukrainian Academy of Sciences Lviv Ukraine; Burshtyn Thermal Electric Power Plant “Zakhidenergo” Open Joint-Stock Company, Burshtyn Ivano-Frankivs’k Region Ukraine
Materials Science (Impact Factor: 0.21). 08/2004; 40(5):668-675. DOI: 10.1007/s11003-005-0098-6

ABSTRACT We study the process of degradation and damage for superheater tubes of the pressure boilers of power plants made of austenitic chromium-nickel steel. The role of sensitization and partial sigmatization of austenitic steel in the embrittlement of the tubes is analyzed.

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    ABSTRACT: We have established that the preliminary plastic deformation of 12Kh18N12T austenitic steel causes cold-work hardening, which depends on the strain rate. With increase in the strain rate of specimens from 8∙10−4 to 417∙10−4 sec−1, both strength (ultimate strength) and plasticity (percentage elongation) characteristics of 12Kh18N12T steel decrease. After holding of the preliminarily work-hardened steel at a temperature of 650°C, its strength increases, and its plasticity decreases. At the same time, the isothermal influence for 1 and 10 h does not facilitate intercrystalline corrosion of the steel during its holding in a corrosive medium for 24 h.
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