[PDF] Oxidation Of Nickel And Cobalt Base Superalloys eBook

Author : Carl H. Lund
Publisher :
Page : 38 pages
File Size : 41,46 MB
Release : 1965
Category : Cobalt alloys
ISBN :

GET BOOK

This report presents information dealing with the oxidation of nickel- and cobalt-base superalloys. All of the superalloys will oxidize at high temperatures when oxygen is present in the enveloping atmosphere. The rate of oxidation depends upon alloy composition, temperature, oxygen concentration, oxides formed, diffusion rates of the metals in both base metal and oxide, diffusion rate of oxygen in the oxide, solubility of oxygen in the matrix, and a host of other variables. The effects of oxidation can be beneficial or they can be harmful. The first section of this report deals with the fundamentals of the oxidation of Ni-Cr and Co-Cr alloys. Subsequent sections discuss general surface oxidation, intergranular oxidation, other subsurface oxidation, and the effect of stress on the rate of oxidation. Numerous specific alloys are mentioned in the report; as an aid to the reader, the appendix contains an alloy index of the alloys mentioned in the report along with the compositions of the alloys, and the pages on which mention of the alloys is made.

Author : I. G. Wright
Publisher :
Page : 70 pages
File Size : 44,8 MB
Release : 1972
Category : Cobalt alloys
ISBN :

GET BOOK

Iron-, nickel-, and cobalt-base superalloys, starting from the compositions Fe-20Cr, Ni-20Cr, and Co-(20 to 25)Cr, have been developed along fundamentally different routes dictated mainly by differing compositional requirements in the search for increased high temperature strength. In Ni-Cr alloys, for example, chromium content has been decreased gradually, and the aluminum content increased to the extent that the alloys now are basically Ni-Cr-Al alloys. In the review current data relating to the oxidation of the relevant pure metals and their binary and ternary alloys are examined first, and then data on oxidation of the more complex engineering alloys are considered. The oxidizing atmosphere is assumed to be oxygen or air, but the mechanisms described generally are applicable to other oxidizing atmospheres. (Author).

Author : Joseph R. Stephens
Publisher :
Page : 30 pages
File Size : 41,25 MB
Release : 1983
Category : Aircraft gas-turbines
ISBN :

GET BOOK

The United States imports over 90 percent of its cobalt, chromium, tantalum and columbium -- all key elements in high temperature nickel-base superalloys for aircraft gas turbine disks and airfoils. NASA, through joint government/industry/university teams, has undertaken a long-range research program (COSAM - Conservation of Strategic Aerospace Materials) aimed at reducing or eliminating these strategic elements by examining their basic roles in superalloys and identifying viable substitutes. This paper discusses research progress in understanding the effects of cobalt and some possible substitutes on microstructure, mechanical properties, and environmental resistance of turbine alloys. (Author).

Author : Blaine Geddes
Publisher : ASM International
Page : 185 pages
File Size : 35,63 MB
Release : 2010-01-01
Category : Technology & Engineering
ISBN : 1615031421

GET BOOK

"This practical guide provides an introduction for understanding the compositional complexity of superalloys superalloy and the wide range of alloys developed for specific applications. The basics of alloying, strengthening mechanisms, and structure of superalloys are explained in optimizing particular mechanical properties, oxidation/corrosion resistance, and manufacturing characteristics such as castability, forgeability, and weldability."--Publisher's description.

Author : Joseph R. Davis
Publisher : ASM International
Page : 450 pages
File Size : 33,52 MB
Release : 2000-01-01
Category : Technology & Engineering
ISBN : 0871706857

GET BOOK

This book is a comprehensive guide to the compositions, properties, processing, performance, and applications of nickel, cobalt, and their alloys. It includes all of the essential information contained in the ASM Handbook series, as well as new or updated coverage in many areas in the nickel, cobalt, and related industries.