Metallography and Microstructures of Heat-Resistant Alloys

HEAT-RESISTANT ALLOYS cover a wide range of chemical compositions, microstructural constituents, and mechanical properties. This article summarizes metallographic techniques and microstructural constituents for three types of cast and wrought heat-resistant alloys: iron-base, nickel-base, and cobalt-base. The metallographic methods discussed also are suitable for preparing both cast and wrought heat-resistant alloys; microstructural constituents are quite similar except for obvious differences in homogeneity and porosity.
The procedures used to prepare metallographic specimens of cast or wrought heat-resistant grades are quite similar to those for ironbase alloys, especially stainless steels (see the Section “Metallographic Techniques” in this Volume). Aspects particularly significant to the preparation of cast or wrought heat-resistant alloys are emphasized. Tables 1 to 3 list the nominal compositions of Fe-Ni-Cr Alloy Casting Institute H-series alloys and other iron-nickel,
nickel-, and cobalt-base cast and wrought heatresistant alloys, respectively.


The articles and presentations that can be down-loaded from this web site are based upon work done by GFV while employed at Bethlehem Steel (1967-1983), Carpenter Technology (1983-1996), Buehler Ltd. (1996-2009) and Struers (2009-Present) and from the authors consulting work for companies such as, Latrobe Steel, Scot Forge, etc., and from his litigation work. GFV's bylined articles appearing in various issues of the ASM Handbook series have been listed here courtesy of ASM International, Materials Park, Ohio.