THE EFFECT OF ANNEALING ON MICROSTRUCTURE OF STEEL NITRONIC 60
Nitronic 60 (UNS S21800) is a highly alloyed austenitic stainless steel with the increased content of manganese and silicon which has good mechanical and corrosion properties at high temperatures and loads. This paper presents the results of investigations of the influence of annealing process on the microstructure of steel Nitronic 60. Heat treatment consisted of annealing from 400 to 850 0 C for four hours followed by cooling in the water. The light and scanning electron microscope (with EDS analysis) were used for microstructure analysis. Analysis showed presence of sigma phase at higher temperatures. The sigma phase was precipited mainly at the austenite grain boundaries, δ/γ interface boundary and δ ferrite phase. Hardness testing showed increasing of hardness with precipitation of sigma phase.
Corrosion of austenitic stainless steels : mechanism, mitigation and monitoring
Introduction to austenitic stainless steels Uniform corrosion of austenitic stainless steels Pitting corrosion Crevice corrosion Sensitization and testing for intergranular corrosion Metallurgical influences on stress corrosion cracking Stress corrosion cracking of austenitic stainless steel weldments Applications of fracture mechanics in stress corrosion cracking and introduction to life prediction approaches Microbiologically influenced corrosion Corrosion of austenitic stainless steel in liquid sodium High temperature corrosion of austenitic stainless steel Corrosion detection and monitoring in austenitic stainless steels using non-destructive testing and evaluation techniques Corrosion related failures of austenitic stainless steel components Surface modification for corrosion protection of austenitic stainless steels General guidelines for corrosion control.
Recrystallization and Sigma Phase Formation as Concurrent and Interacting Phenomena in 25%Cr-20%Ni Steel
The distribution of dislocations depends also on the methods of applying a plastic deformation. Previous investigations(2) have shown that a deformation texture is different in materials which have received tension, compression or drawing. Dillamore et al.(2) presented a theoretical treatment for textural analysis of tension or compression. They, furthermore, analyzed a deformation texture of rolled materials, on the basis of several assumptions that a rolling process consists of tensile action in a direction parallel to the rolling direction and compressive action in the direction parallel to the rolling plane normal, and that a material should follow a path such as to resolve the greatest shear stress. They were successfully able to explain the final texture of rolled aluminum and silver, each having, respectively,