Accession Number : AD0431508

Title :   METALLURGICAL EXAMINATION OF HASTELLOY X FOR CORROSION,

Corporate Author : MCDONNELL AIRCRAFT CORP ST LOUIS MO

Personal Author(s) : Morris,G.

Report Date : 10 MAR 1964

Pagination or Media Count : 5

Abstract : Three pieces of Hastelloy X sheet material were pickled for one hour in a nitric-hydrofluoric solution after being cooled slowly from 2150F in the following manners: (1) Sheet 1 -- Air cooled, (2) Sheet 2 -- Cooled between two steel plates that were preheated to 2150F, and (3) Sheet 3 -Cooled in a box of heated mica. A metallographic specimen was removed from each of the sheets and examined at 250X. The metallographic specimens were examined and photographed both unetched and after electrolytic etching using a 10% oxalic electrolyte. Intergranular attack was evident in each of the three specimens examined. Mica appeared to produce the most severe intergranular attack. Air cooling appeared to produce the least amount of surface attack of the three cooling methods evaluated. (Author)

Descriptors :   (*NICKEL ALLOYS, CORROSION), (*METALLOGRAPHY, NICKEL ALLOYS), CHROMIUM, HEAT TREATMENT, COOLING, PICKLING, NITRIC ACID, FLUORINE COMPOUNDS, ACIDS, PHOTOMICROGRAPHY

Distribution Statement : APPROVED FOR PUBLIC RELEASE