Study on the Corrosion Fatigue Properties of 12Cr1MoV Steel at High Temperature in Different Salt Environments

Abstract

Biomass energy, as a reliable renewable energy source, has gained more and more attention. However, microstructure degradation and corrosion fatigue damage of heat pipes hinder its further application. In this paper, high temperature corrosion fatigue characteristics of 12Cr1MoV steel under a mixed alkali metal chloride salt environment and mixed sulfate salt environment were investigated. Fatigue tests with different total strain amplitudes were performed. Results show that the effect of total strain amplitude on the cyclic stress response of the alloy is approximately the same under three different deformation conditions. With the increase of the cyclic numbers, the alloyed steel mainly exhibited cyclic hardening during loading. The fatigue properties in air environment were the best, which is most obvious when the total strain amplitude is ±0.3%. The fatigue life of samples in mixed alkali metal salts is the shortest. Furthermore, the fatigue fracture morphology of the alloyed steel in different environments were also deeply analyzed. This experimental study attempts to provide a theoretical reference for solving the problem of rapid failure of heat pipes in biomass boilers, and to establish a scientific basis for the material selection and safety operation.

Study of Corrosion Kinetic Measurement and Morphology Observation of Superheater Tube 12Cr1MoV Alloy in Simulated MSWI Flue Gas Containing Varied HCl or SO2 Concentrations

“…The investigated alloy, 12Cr1MoV, is high-strength low-alloy steel with an excellent corrosion resistance and mechanical properties, widely used in superheater tubes at temperatures below 600 °C in biomass boilers and coal-fired boilers. 41 It is also an economical material commonly used in some high superheater and all low superheater tubes in WTE plants in China. In this work, 12Cr1MoV alloy was chosen as the corrosion object to reveal the role of HCl and SO 2 played in MSW flue gas corrosion.…”

“…The test concentrations of HCl or SO 2 were based on the flue gas environment typically operated in WTE plants in China. The investigated alloy, 12Cr1MoV, is high-strength low-alloy steel with an excellent corrosion resistance and mechanical properties, widely used in superheater tubes at temperatures below 600 °C in biomass boilers and coal-fired boilers . It is also an economical material commonly used in some high superheater and all low superheater tubes in WTE plants in China.…”

Fatigue and Fracture of Traditional and Advanced Structural Alloys

“…An aggressive environment due to corrosion and temperature can be extremely critical for the fatigue life of a structure in their service conditions [3]. Designers must consider corrosion in service Metals 2020, 10, 1645; doi:10.3390/met10121645 www.mdpi.com/journal/metals and high temperature for a proper design against fatigue loadings.…”

“…Corrosion is also undesirable for reasons related to a safe and economic use of a structure during its service life. Some recent advances of the topic are present in [3] providing a useful and update overview of the problem connected with the fatigue damage of structural materials. A variety of connected topics have been discussed in the present Special Issue of Metals, providing a wide overview of recent developments on different aspects of fracture and fatigue tools available for fracture and fatigue assessment of traditional and innovative materials.…”