Accession Number : AD0462896


Title :   STRUCTURAL STUDIES OF BEARING STEEL UNDERGOING CYCLIC STRESSING.


Descriptive Note : Summary rept. no. 1,


Corporate Author : SKF INDUSTRIES INC KING OF PRUSSIA PA ENGINEERING AND RESEARCH CENTER


Personal Author(s) : Martin, J A


Report Date : 03 May 1965


Pagination or Media Count : 1


Abstract : The development of white etching areas in hardened steels is a well known phenomenon associated with cyclic stressing in rolling contact. This particular type of microstructural change has been studied in detail and the following characteristics have been determined: (1) shape and size; (2) orientation to the surface; (3) the density distribution of white areas with depth has been determined and related to the distribution of shear stresses with depth below the contact surface; (4) the rate of white area development with cycling has been compared for two groups of bearings (a) an air melt 52100 steel group which exhibited average group life behavior, and (b) a group of bearings made from the fifth vacuum remelt of the same steel described above, which exhibited a group life nearly 4 times higher than the above group; (5) the tempering behavior of white areas has been studied in detail between room temperature and 750 C; and (6) the appearance of white areas after treatment with different etchants and various degrees of etching have been studied by light and electron replica microscopy. A second microconstituent in the vicinity of white etching areas was identified as carbides. (Author)


Descriptors :   *BEARINGS , STEEL , MICROSTRUCTURE , FATIGUE(MECHANICS) , FRACTURE(MECHANICS) , FRACTOGRAPHY , ELECTRON MICROSCOPY , CARBIDES , PHOTOGRAPHIC ANALYSIS


Distribution Statement : APPROVED FOR PUBLIC RELEASE