Accession Number : AD0638900

Title :   A STATISTICAL AND METALLOGRAPHICAL STUDY OF MECHANICAL PROPERTIES OF FERRITIC MAGNESIUM CAST IRON.

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Gupta,A. M.

Report Date : 25 APR 1966

Pagination or Media Count : 11

Abstract : Statistical evaluation showed that the composition of the basic cast iron is perfectly uniform and corresponds to the desired composition. That is why it is impossible to see the cause of mechanical properties fluctuation in chemical compound. The diagrams which are the results of statistical investigation showed further interested dependences: a. It appears, that to a definite tensile strength value and of the extension exist line are dependences between both values. This dependences will come into disorder if the tensile strength value will exceed a definite limit. b. In dependence upon the metal value and form of the separated graphite in the area higher than tensile strength varies ductility at a definite strength value in a considerable degree. It was established by metallographic investigations, that the microstructures of the sample are mutually clearly different. The basic metal value was formed mostly by ferrite, which contained graphite grains. If in the structure in addition to granular graphite and ferrite is present a basic amount of scaly graphite or perlite, a drop in ductility appears in comparison with the material of identical strength. Ductility is lower by the fact that the greater amount of scaly graphite and perlite in the structure occurs. The extremely very low tensile strength and very low ductility is due to the presence of a greater amount of scaly graphite in the entire area of the polishing. Graphite grains are used on the polished area only in very small number and size.

Descriptors :   (*IRON, CASTINGS), (*CASTING ALLOYS, MECHANICAL PROPERTIES), MAGNESIUM ALLOYS, DUCTILITY, TENSILE PROPERTIES, MICROSTRUCTURE, METALLOGRAPHY, CZECHOSLOVAKIA, STATISTICAL ANALYSIS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE