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Conventional quenching and tempering (CQ-T) process does not always ensure the achievement of desired toughness of the steels with residual element tin. In the present work, a novel intercritical heat treatment (Q-IQ-T) process consisting of quenching (Q), intercritical quenching (IQ) and tempering (T) is adopted. The results show that the microstructure of the Q-IQ-T specimens consists of tempered martensite (M) and ferrite (F), which is finer than the full martensitic microstructure of the CQ-T specimens. 0.03%, 0.06% and 0.09% tin contents reduce the impact energy values of CQ-T specimens by 22.95%, 29.61% and 45.93%, respectively, while those of the Q-IQ-T specimens decrease by 19.25%, 17.32% and 21.32%, respectively. Together with comparison to the CQ-T specimen with 0.09% tin, the impact energy value of Q-IQ-T specimen increases by 85.24%, from 40.86 J to 75.69 J. And the fracture morphology changes from brittle fracture to ductile fracture.

Effect of heat treatment processes on the microstructure and mechanical properties of low alloy structural steels with different impurity tin contents