Multi-temperature quenching of ductile iron

- Mar 03, 2017 -

Ductile iron can be obtained by isothermal quenching high strength, while both good plasticity and toughness. Multi-temperature quenching heating temperature of the main consideration to make the original organization of all A, no residual F, but also to avoid A grain growth. Heating temperature is generally used Afc1 above 30 ~ 50 ℃, isothermal treatment temperature of 0 ~ 350 ℃ to ensure access to a comprehensive mechanical properties of the lower bainite organization. Rare earth magnesium aluminum ductile iron isothermal quenching after σb = 1200 ~ 1400MPa, αk = 3 ~ 3.6J / cm2, HRC = 47 ~ 51. But should pay attention to the isothermal quenching and then add a tempering process.

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