Accession Number : AD0719793

Title :   Investigation of the Density Dislocations of Phase Components in Friction Surfaces of High-Strength Cast Irons,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Markovskaya,L. I. ; Markovskii,E. A.

Report Date : 03 DEC 1970

Pagination or Media Count : 19

Abstract : The changes in dislocation density in surface layers of high strength cast irons with ferritic and pearlitic structure by the action of dry and lubricated friction were studied at various rates and loads for 2-4 hours. Ferritic cast iron before and after dry friction testing for wear had 6 X 10 10 to the 11th power and 2 X 10 10 to the 12th power linear defects/cm sq cm resp. in the alpha-phase. High-strength pearlitic cast-iron had a higher amt. of dislocations after dry friction testing for wear, (5 X 10, 10 to the 12th power,/cm, sq cm. The friction with lubrication had an effect similar to that of dry friction. The gamma-phase showed a max. dislocation d. 5-10 times that in the alpha-phase, and this d. depended significantly on the slip rate. Lubricated friction resulted in dislocation ds. 2.5-3 times that with dry friction. The dislocation d. produced with friction deformation may reach the value of 3 X 10 to the 13th power/sq cm, which is close to the theoretically possible max. dislocation density. (Author)

Descriptors :   (*IRON ALLOYS, WEAR RESISTANCE), DISLOCATIONS, DENSITY, FRICTION, USSR

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE