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Shvoong Home>Science>Phase Transformation and Structure and Property of Bainitic Steels with RE and Al Elemen Summary

Phase Transformation and Structure and Property of Bainitic Steels with RE and Al Elemen

Article Summary   by:TsingHua     Original Author: HEAT TREATMENT OF METALS
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The effect of minor-alloying elements RE,Al on phase transformation kinetics within 700~560℃ and 380~320℃ and structure properties of bainitic steels was studied.The microstructure consists of well distributed fine bainites,tempering martensites,carbides and a small amount of austenite after forging air cooling.Under microscope the needle appearance of bainite (including martensite)is hardly distinguished.It is a hidden-crystal bainite or thin-needle.The addition of minor alloying element RE does not accelerate pearlite transformation,but it is a little delay the pearlite transformation.It fines microstructure,and improves impact toughness,the addition of minor-alloying element Al accelerates the pearlite transformation and it also fines microstructure and improves impact toughness.The addition of RE and Al elements at same time has additive effect.The effect of minor-alloying elements RE,Al on phase transformation kinetics within 700~560℃ and 380~320℃ and structure properties of bainitic steels was studied.The microstructure consists of well distributed fine bainites,tempering martensites,carbides and a small amount of austenite after forging air cooling.Under microscope the needle appearance of bainite (including martensite)is hardly distinguished.It is a hidden-crystal bainite or thin-needle.The addition of minor alloying element RE does not accelerate pearlite transformation,but it is a little delay the pearlite transformation.It fines microstructure,and improves impact toughness,the addition of minor-alloying element Al accelerates the pearlite transformation and it also fines microstructure and improves impact toughness.The addition of RE and Al elements at same time has additive effect.
Published: August 25, 2000   
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