Bøger af Ram Krishna

In the five sections of this peer-reviewed edited volume, the design, extraction, processing, mechanical and microstructural considerations, and applications of titanium and its alloys are examined. The design section summarizes techniques for designing materials for high-performance titanium alloys. The extraction section describes the development of extraction technologies that will produce high-purity metallic materials, using the principles of extraction metallurgy. The processing section discusses low-cost preparation technologies for titanium alloys and their applications in sustainable titanium industries. Research progress on the shock response and mechanical properties of titanium alloys, and their microstructural evolution, is dealt with in the section on mechanical properties with microstructural considerations. The final section examines the contribution of titanium applications to the development of sustainability in titanium industries.

Nickel-based superalloys are currently being investigated for high-temperature applications in advanced steam power plant operating at temperatures of 700¿C and above. Three nickel-based superalloys Inconel 617, Inconel 625 and Nimonic 263 alloys, which are of primary interest for boiler technology components such as furnace walls, superheater tubes, header and steam pipes, etc and for steam turbine technology components such as HP &IP cylinders, rotor forgings, casing and valve chest, blading, etc., have been evaluated for long and short term creep performance. Creep deformation processes occurring at high temperatures and stresses lead to the evolution of microstructures in the form of precipitation, precipitate coarsening and recovery effects. The deterioration in mechanical properties as a result of this microstructural change has been evaluated by hardness testing. This work discusses the microstructural evolution occurring in alloys in samples that have been creep-exposed at a series of temperatures from 650°C to 775°C and for durations from 1000 to 45,000 hours using advanced FEGSEM, TEM, XRD and phase extraction techniques. The fractions and morphology of different phases,