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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
Materials Science (Impact Factor: 0.27). 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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