The mechanical properties of AISI 4140 steel shaft with a diameter larger than 200 mm are difficult to meet the requirements and cracking occurs easily in water quenching,due to insufficient cooling ability of oil que...The mechanical properties of AISI 4140 steel shaft with a diameter larger than 200 mm are difficult to meet the requirements and cracking occurs easily in water quenching,due to insufficient cooling ability of oil quenching.A new technology,named alternately timed quenching (ATQ),using water and air in turn as quenching media instead of oil or polymer aqueous solution,is applied to quench the large-scale AISI 4140 steel shaft.Two ATQ processes are determined with the aid of computer simulation first and the corresponding experiments are carried out consequently.The results show that the proposed technology can significantly reduce the surface cracking tendency and improve the mechanical properties in practical production of such large-scale shaft forgings.展开更多
In order to obtain the desired mechanical properties of connecting bar after quenching and tempering,and reduce the cracking tendency and distortion,a program of controllable quenching was established.Furthermore,a co...In order to obtain the desired mechanical properties of connecting bar after quenching and tempering,and reduce the cracking tendency and distortion,a program of controllable quenching was established.Furthermore,a computer-aided quenching (CAQ) system was developed.The applications show satisfactory results.展开更多
文摘The mechanical properties of AISI 4140 steel shaft with a diameter larger than 200 mm are difficult to meet the requirements and cracking occurs easily in water quenching,due to insufficient cooling ability of oil quenching.A new technology,named alternately timed quenching (ATQ),using water and air in turn as quenching media instead of oil or polymer aqueous solution,is applied to quench the large-scale AISI 4140 steel shaft.Two ATQ processes are determined with the aid of computer simulation first and the corresponding experiments are carried out consequently.The results show that the proposed technology can significantly reduce the surface cracking tendency and improve the mechanical properties in practical production of such large-scale shaft forgings.
文摘In order to obtain the desired mechanical properties of connecting bar after quenching and tempering,and reduce the cracking tendency and distortion,a program of controllable quenching was established.Furthermore,a computer-aided quenching (CAQ) system was developed.The applications show satisfactory results.
