Abstract:

YWhen the 45 and 40Cr steel parts were quenched in a medium with different concentrations, an isolating polymer film can be formed on the metal surface during the cooling cycle, which resulted in deeper hardening depth and less distortion than those quenched in wate-or oil. Quenching crack can also be prevented. In addition, normal microstructure and satisfactory mechanical properties can be reached.Test results show that these quenchants are particularly effective for the quenching of steel parts. This paper finally elucidates some of the managing problems of CH-202M quenchant in practical use.

Key words: polymer quenchant, isolating film, hardening depth, quenching distortion, quenching crack