“…AISI 52100 steel has high hardness, high strength, good wear resistance and high contact fatigue strength after quenching and tempering. Because of its good performance, it is often used to manufacture molds and precision measuring tools [ [1] , [2] , [3] , [4] ]. AISI 52100 steel is one of the most widely used materials in the field of bearin, however, after traditional heat treatment, the transformation of retained austenite to untempered martensite will occur in the process of long-term service of AISI 52100 steel, resulting in problems such as reduced hardness, loss of precision and decreased fatigue life [ [5] , [6] , [7] ].…”