Abstract
The effect of quenching medium on the microstructure and mechanical properties has been investigated for the 42CrMo steel, which is used in a polar crane for the nuclear power station. Experimental results indicates that the microstructure of the air quenched 42CrMo steel is pearlite , proeutectoid ferrite and a small amount of upper bainite. The microstructure of 42CrMo after oil quenching is lower bainite and martensite, and changed to martensite and a small amount of lower bainite after water quenching. The Charpy impact energy at -12°C of the air ,oil and water quenched samples after 560°C tempering is 12J, 22J and 59J, respectively. The decrease of proeutectoid ferrite significantly improves the Charpy impact energy of the investigated steel. The strength and impact property of 42CrMo under water quenching together with 560°C tempering can meet the requirements of the wheel and level wheel for the polar crane.
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