Accession Number : AD0615823

Title :   DETECTION AND EVALUATION OF SURFACE DECARBURIZATION OF STEEL COMPONENTS BY MEANS OF ROCKWELL HARDNESS TEST PROCEDURES,

Corporate Author : FRANKFORD ARSENAL PHILADELPHIA PA RESEARCH AND DEVELOPMENT DIRECTORATE

Personal Author(s) : Rogus,B. J.

Report Date : APR 1965

Pagination or Media Count : 48

Abstract : A test procedure is outlined which permits detection and evaluation of surface decarburization on steel. The procedure consists of making a series of Rockwell hardness tests on the specimen surfaces using several Rockwell test scales. Evaluation of the surface decarburization is made by comparing values obtained for either Rockwell D, A, 15N, 30N, or 45N test scales with values anticipated for these scales. The anticipated values are derived by means of Rockwell C tests made on the test surface and hardness conversion tables. The procedure is based on the difference in depth of Rockwell indentations between tests of different loads. Surface decarburization usually results in a progressive lowering of hardness levels from the component interior to the decarburized surface. Therefore, indentations of different depths, resulting from different test loads, reflect related variations in strength levels. With proper use, the described method will prove helpful in the detection and evaluation of surface decarburization conditions present on steel component items made of plain carbon steel. (Author)

Descriptors :   (*STEEL, SURFACE PROPERTIES), (*TEST METHODS, HARDNESS), CARBON, NONDESTRUCTIVE TESTING, CARBON ALLOYS

Distribution Statement : APPROVED FOR PUBLIC RELEASE