The demand for pipeline steels has increased in the last several decades since they were able to provide an immune and economical way to carry oil and natural gas over long distances. There are two important damage modes in pipeline steels including stress corrosion cracking (SCC) and hydrogen induced cracking (HIC). The SCC cracks are those cracks which are induced due to the combined effects of a corrosive environment and sustained tensile stress. The present review article is an attempt to highlight important factors affecting the SCC in pipeline steels. Based on a literature survey, it is concluded that many factors, such as microstructure of steel, residual stresses, chemical composition of steel, applied load, alternating current (AC) current and texture, and grain boundary character affect the SCC crack initiation and propagation in pipeline steels. It is also found that crystallographic texture plays a key role in crack propagation. Grain boundaries associated with {111}∥rolling plane, {110}∥rolling plane, coincidence site lattice boundaries and low angle grain boundaries are recognized as crack resistant paths while grains with high angle grain boundaries provide easy path for the SCC intergranular crack propagation. Finally, the SCC resistance in pipeline steels is improved by modifying the microstructure of steel or controlling the texture and grain boundary character.

Since gas turbines are used in airplanes, ship engines and power plants, they play a significant role in providing sustainable energy. Turbines are designed for a certain lifetime according to their operating conditions and the failure mechanisms they deal with. However, most of them experience unexpected and catastrophic failure as a result of synergistic effects of more than one damage mechanism. One of the main causes of failure in turbines is corrosion fatigue, which results from the combination of cyclic loads and corrosive environments. In the current review paper, an attempt has been made to investigate the damages related to corrosion and fatigue in turbines such as fatigue corrosion, hot corrosion and oxidation, thermomechanical fatigue, emphasizing their synergistic effect. In this regard, the mechanism of fatigue crack initiation and growth in a corrosive environment is also taken into consideration. Moreover, a summary of the results reported in the literature regarding the influence of the loading conditions, characteristics of the corrosive environment and properties of the turbine materials on this failure is presented. Finally, common methods of dealing with corrosion fatigue damage, including surface treatment and cathodic protection, are briefly reviewed.