Grain size is an important parameter controlling the mechanical behavior and useful life of turbine disks. During heat treatment above the gamma prime (γ′) solvus the grain size increases dramatically as the γ′ particles dissolve. The grain size then stagnates as the volume fraction of the γ′ phase approaches zero. In general, the grain size at stagnation cannot be described by classic Zener pi...

The distribution of the characteristic texture components between the ferrite grains of different size classes has been studied in a steel with 0.082%C, 1.54% Mn, 0.35% Si, 0.055%Nb and 0.078%V after different rolling schedules with a final rolling temperature above or below Ar3. Microstructures and textures were characterized by means of optical microscopy and orientation microscopy. A strong ...

Controlling the hot rolling process requires a deep understanding of underlying metallurgical phenomena. Quantitative methods are paramount importance for achieving capability controlling microstructural evolution. Since final mechanical properties steel result from evolution in whole process, analysis microstructure provides an important input numerical simulations that can be used tailoring s...

Serial sectioning technique provides plenty of quantitative geometric information of the microstructure analyzed, including those unavailable from stereology with oneand two-dimensional probes. This may be why it used to be and is being continuously served as one of the most common and invaluable methods to study the size and the size distribution, the topology and the distribution of topology ...

We report an approach to reduce grain size for perpendicular media by using an Ar-ion etched Ru seedlayer. The surface etching affects the microstructure of the subsequent high pressure deposited Ru2+SiO2 interlayer and magnetic layer, whose grain size can be controlled. SiO2 in the interlayer plays a more important role in grain size reduction on the etched seedlayer than the as-grown seedlaye...