THE TEMPERING BEHAVIOR OF DEFORMATION BANDS IN 52100 STEEL.
Special rept. 1 May 66-30 Apr 67,
SKF INDUSTRIES INC KING OF PRUSSIA PA RESEARCH LAB
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The deformation bands which form in cyclically stressed rolling bearings were tempered in the electron microscope to establish the carbon level in solid solution in these areas. In most of the specimens no carbide precipitation occurred in these regions when they were tempered at 550 C. In one specimen, tempered at 325 C, many tiny carbides formed at the cell walls inside the deformation bands. These observations are consistent with a theory proposed for the growth of lenticular carbides which form at the boundaries of the deformation bands in 52100 steel during cyclic stressing. The deformation bands which are free of excess carbon are regions where lenticular carbides have grown and depleted the area of carbon while the bands which were supersaturated with carbon were free of lenticular carbides. It is concluded that the lenticular carbides grow by utilizing the excess carbon in the deformation bands and continue to grow until the carbon level inside the deformation band has reached the equilibrium concentration. Author
- Metallurgy and Metallography