Abstract
Effect of subcritical quenching on austenite crystal and the degree of hardness of 60Si2Mn steel were studied by experiment. The results show that non-dissolved ferrolites inhibited austenite’s growth, so grains of 60Si2Mn steel after intercritical hardening was thinner than conventional quenching. With the elongation of holding time the grain size grown up, and the hardness decreased sharply, and the optimum holding time is 0.5h. What’s more, the temperature made a sharply effect to the hardness of 60Si2Mn steel when the holding time is 0.5h, and the optimum temperature is 820°C.
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