Metallographic Techniques for Superalloys

Introduction

Preparation of superalloys for microstructural examination is not exceptionally difficult. The procedures are similar to those used to prepare stainless steels. Because they are facecentered cubic “austenitic” alloys with exceptionally good toughness, machinability is poorer than for steels and the age hardened alloys, especially the cast alloys, can be more difficult to section than most steels when they have a very high ' content. FCC metals readily deform and work harden, consequently aggressive sectioning methods (e.g., power-hacksawing or band sawing) will introduce considerable damage which can be very difficult to remove in the subsequent preparation steps. If these procedures must be used, it is advisable to re-section the material with the correct abrasive cutoff wheel (consumable type) with abundant cooling.

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resourcesThe 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.

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