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Full Description
The European Collaborative Programme on Materials for Gas Turbines known as COST-50 was initiated in 1971 and has been supported since then by the Commission of European Communities. The achievements made during the first phase of COST-50 were reviewed at the Conference held in Liege, September 25-27, 1978 and published by Applied Science Publishers Ltd. Nine European Countries : Austria, Belgium, the Federal Republic of Germany, France, Italy, The Netherlands, Sweden, Switzerland, the United Kingdom, and the Joint Research Center of the Community, agreed to continue their participation in COST-50 and the results of the second phase were presented at the Conference held in Liege, October 4-6, 1982 under the following headings : - Corrosion and Coatings - Fatigue, Creep and Structural Stability - Processing The technical sessions consisted of invited papers reviewing recent progress in the development of high temperature alloys with particular emphasis on the results of the European Collaborative Programme. Furthermore, some areas were reviewed by eminent speakers from the United States of America, due to their expertise in their respective fields. In this context and as a tradition introduced in 1978, the keynote lecture "Superalloys technology : today and tomorrow" was del ivered by Dr. F. L. Versnyder. The Conference was completed with a significant Poster Session comprising about fifty contributions from Europe and elsewhere. This book comprises a total of fifty four contributions representing almost all of the papers delivered at the technical sessions and a large part of the presentations made at the Poster Session.
Contents
Keynote Lecture Superalloy Technology-Today and Tomorrow.- I - Corrosion and Coatings.- Recent approaches to the development of corrosion resistant coatings.- The corrosion resistance of protective coatings.- Mechanisms of hot corrosion.- Deposition and blade fouling of gas turbines by fuel impurities and additives.- Comparison of hot-salt corrosion test procedures.- High temperature erosion and erosion-hot corrosion of superalloys and coatings.- Hot corrosion in marine gas turbines.- High temperature stability of pack aluminide coatings on IN 738 LC.- Thermochemical treatment of porous materials.- II - Fatigue, Creep and Structural Stability.- Review Papers.- Fatigue and creep considerations in the design of turbine components.- Low cycle fatigue and life prediction methods.- High cycle fatigue properties of cast nickel base superalloys IN 738 LC and IN 939.- Fracture mechanics and crack growth in fatigue.- IN 939: metallurgy, properties and performance.- Creep strengthening mechanisms.- Effects of cobalt in nickel-base superalloys.- Creep damage and fracture.- Effects of coatings on the mechanical properties of superalloys.- The interaction of high temperature corrosion and mechanical properties of alloys.- Creep-Fatigue.- The influence of creep on the high temperature cyclic life of IN 738 LC.- Some interactions of creep and fatigue in IN 738 LC at 850oC.- Analysis of creep rupture data of Nimocast 739.- Factors influencing the creep behaviour of a cast Ni-Cr base alloy.- Time dependent low cycle fatigue of PM Astroloy at 1003 K.- Fatigue crack propagation at elevated temperature in Mar-M-002 single crystals.- An operational definition of life to crack initiation in high temperature fatigue.- High temperature fatigue of a superalloy for cast turbine wheel.- Fatigueof high temperature materials at ultrasonic frequencies.- Crack initiation and propagation in a forged nickel-base alloy under high mechanical and thermal loading.- Fatigue failure under fretting conditions.- Mechanisms of high cycle fatigue of cast nickel base alloys.- Microstructure-Effects of Coatings and Environment 703.- Phase composition and phase stability of alloy IN 939.- Alloy design for nickel-base superalloys.- OPS ferritic steels with high damping capacity.- Relations between chemistry, solidification behaviour and microstructure in IN-100.- Grain boundary pore chains in cast nickel base superalloys.- The effets of section size, coating and environment on creep rupture behaviour of superalloys.- The influence of applied coatings on the creep fracture of IN 738 LC.- High temperature low-cycle fatigue behaviour of IN 738 LC alloy in air and in vacuum.- The effect of hot corrosion on creep and fracture behaviour of cast nickel-based superalloy IN 738 LC.- III - Processing.- VADER: a new melting and casting technology.- The evolution of the forging processes on discs.- The relationship between structure, properties and processing in powder metallurgy superalloys.- Precision casting of turbine blades and vanes.- Welding of PM-superalloys.- Blade repair and recovery.- Microporosity formation in investment castings of nickel-base superalloys: metallurgical effects, thermal modelling and foundry assessment.- Formation of micropores in a D.S. Ni-Ti-C alloy.- Investigation of the surface grain refinement for superalloys castings.- Hot isostatic pressing of alloy IN-718.- The nature and origin of previous particle boundary (PPB) precipitates in P/M superalloys.- Forging Astroloy supersolidus-sintered preforms: necklace structure achievement..- Diffusion bonding of superalloys for gas turbines.- Author index.
