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Prediction of quenched and tempered cast steel properties

The influence of processing parameters, such as pouring temperature and cooling rate during the casting, as well as, application of hot working and pre-heat treatment, on yield strength and Charpy-V notch toughness of quenched and tempered steel was investigated. Experimental procedure of statistical analysis was done using the factorial experiment. The research was focused mainly on Charpy-V notch toughness of carbon and low alloyed heat treatable steels. It was found out that yield strength is insensitive to differences between applied manufacturing processes, but Charpy-V notch toughness is increased by application of both, hot working and proper pouring temperature. Also, Charpy-V notch toughness is increased by interactive effect between the appropriate cooling rate during the casting and application of hot working. Test results of investigated mechanical properties were verified by microstructure analysis. It was found out that hot worked and normalized specimens have more refined microstructure than other non-treated specimens. ASTM grain size number of previous austenite of investigated steel treated by hot working was equal to N.6-N.7, while ASTM grain size number of previous austenite of steel without hot working application was equal to N.4-N.5. Original relation for the prediction of quenched and tempered steel and cast steel Charpy-V notch toughness are developed. The developed relations were used for prediction of tensile strength, yield strength and Charpy-V notch toughness of quenched and tempered cast steel workpiece.

computer simulation; quenching and tempering; cast steel; charpy-V notch toughness

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