Accession Number : AD0714879

Title :   Wear Mechanism of Steel and Iron Materials for Guide Stands,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Gogitishvili,R. N.

Report Date : 08 SEP 1970

Pagination or Media Count : 9

Abstract : The physical and mechanical changes were investigated arising from friction and wear. Upper and lower specimens were prepared from cast iron GG-26. Spring steel S-85 and steel SK-45 were used for lower and upper test pieces, respectively. The lower models served to stimulate the guide stands, and the upper, the moving units. The average wear values were plotted vs. the friction tracks. From electron microphotos of the metal surfaces the plastic deformation was observed at the point of contact. This was accompanied by structural changes depending on the extent of deformation. The changes noticed were: breaking up of carbides, graphite inclusions, and fissures in the pearlite base of the metals. The depth of a strongly deformed surface is 5 mu. As result of the plastic deformation the surface hardens, on the lower test pieces slightly more than the upper ones. The wear of the metals tried is largely abrasive, the rate of abrasion depending on the size of the particles torn off. The determination of the microhardness in the adhesion spots, caused through friction and wear, is of importance. Of the metals tried, spring steel displayed the highest resistance to wear. Its use is recommended for guides in heavy boring and planing machines, coupled with guides of moving units, made of cast iron or plastic material.

Descriptors :   (*STEEL, WEAR RESISTANCE), (*IRON ALLOYS, WEAR RESISTANCE), CASTINGS, FRICTION, DEFORMATION, SUPPORTS, USSR

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE