Fatigue Behavior of 9–12% Cr Ferritic-Martensitic Steel

Abstract

In this chapter, the cyclic fatigue behavior of the 9--12%Cr ferritic-martensitic steel used in power plants is systematically summarized. At first, the application background and the basic information of these kinds of materials are discussed. The 9--12%Cr martensitic steel has been extensively used in the supercritical steam turbine components in the thermal power plants. The fully understanding of the effects of materials properties and softening behavior on low cycle fatigue (LCF) are important in the improvement of structural design and the reliability assessment for its safety operation. Subsequently, the LCF properties, the nucleation and growth of fatigue crack, and the evolution of microstructure are further discussed. The previous research results and the factors that affect the LCF behavior are also summarized in these sections. Lastly, a brief summary of the chapter and the new research method related to the fatigue behavior of 9--12%Cr ferritic-martensitic steel are introduced for further investigating. This chapter serves as a quick reference of entering the fatigue behavior of materials for researchers, engineers, and students in the mechanical and materials engineering field.