Accession Number : AD0626124

Title :   CORRELATION OF MICROSTRUCTURE AND BALLISTIC PROPERTIES OF ARMOR PLATE,

Corporate Author : WATERTOWN ARSENAL MASS

Personal Author(s) : Reed,E. L. ; Kruegel,S. L.

Report Date : 11 JUL 1938

Pagination or Media Count : 66

Abstract : Results are based on normal impact of caliber .30 armor piercing ammunition upon plate, 1/2 in and lighter, shock test data not being available. Heavier plate was tested only with caliber .50 A.P., with the exception of two 1 in plates which were tested with 37 mm. M39 solid shot. Laminations of any considerable extent are a primary cause of spalling in plate of passable ballistic limit. Carbides (or any other segregates which may be revealed by a Murakami etch) in definite chains in grain boundaries produce spalling. Martensitic structure invariably caused spalling, while a fairly uniform troostitosorbitic structure was found in the majority of high ballistic nonspalling plate. Eliminating all plate with laminations, bad carbide conditions and nonuniform nital structure, Brinell hardnesses from 418 to as high as 444 were found to produce the highest ballistic plate which did not spall under the caliber .30 A.P. tests to which they were subjected. Macro segregations in the form of banding (in the absence of elongated nonmetallic inclusions) were found in both high and low ballistic plate. (Author)

Descriptors :   (*ARMOR PLATE, MICROSTRUCTURE), (*TERMINAL BALLISTICS, ARMOR PLATE), FRACTURE(MECHANICS), STEEL, CHROMIUM ALLOYS, MOLYBDENUM, VANADIUM ALLOYS, NICKEL ALLOYS, SILICON, MANGANESE ALLOYS, CARBIDES, IMPACT TESTS, HARDNESS, MARTENSITE, TUNGSTEN ALLOYS

Subject Categories : Properties of Metals and Alloys
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE