| The normal AISI 52100 steel widely used as bearing steels shows very different properties with austenitizing and tempering temperatures. A study on the 1.0％C-1.4％Cr steel revealed that the contents of undissolved carbide was decreased with austenitizing temperature, and the martensite was plate martensite which has internal twins oriented {112}_T, the retained austenite was increased with the austenitizing temperature, and transformed to martensite with sub-zero treatment, with tempering temperature, the carbide was increased and over aged at 250℃ and the orientation relationship with matrix was as follows. { 011 } m // { 0001 }_ε The hardness value was increased with austenitizing temperature, but above 840℃ the hardness value was changed slightly and decreased with tempering temperature. |
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