2008•Heat treatment of metalsRequires access
Influence of heat treatment on microstructure and mechanical properties of new bainite drill steel
Yuanhui Wang
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Abstract
Influences of heat treatment on microstructure and mechanical properties of new bainite drill steel were studied with observation of metallographs and performance test of the steel.The results show that the new bainite drill steel has better strength and toughness,and hardenability treated in different cooling medium after austenitization.The test steel has best strength and toughness after austenitized at 900 ℃ with air cooling and tempering at 300 ℃.The temper brittleness appears at 500 ℃,which is related to the decomposed carbides from bainite ferrite and retained austenite.The optimum heat treatment process and applications for the bainite drill steel were put forward.