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• W3148248600 abstract "To well balance the hardness and toughness,existing commercial medium carbon ultra-high strength wear resistance steel plates with hardness above 500 HBW are usually reheated and quenched after hot rolled to production thickness,and then tempered to improve the final mechanical properties of the plates.But the ductility which can be improved by the tempering of martensite is low.Quenching and partitioning(QP) and quenchingpartitioning-tempering(Q-P-T) heat treatment processes were proposed to stabilize the austenite phase via carbon partitioning,and improve the toughness and ductility of martensitic steel by the soft retained austenite.The effects of these heat treatment techniques are much better than conventional quenching and tempering process,but the potential of the procedure before heat treatment during the overall production process is not fully developed.In this work,a medium carbon alloy steel with Nb addition was processed by two-stage control rolling followed by water cooling,low temperature relaxation of supercooled austenite,air cooling(thermo-mechanical rolling process,TMCP).The TMCP state samples were then reheated to 900 ℃ and quenched in water(WQ).After that,the WQ state samples were tempered at 200~400 ℃ for 40 min(QT).On the basis of mechanical properties test,the microstructures of the tested steel at different states were characterized by means of OM,SEM,TEM and XRD,to reveal the effects of microstructure evolution on the mechanical properties.Contributed by the much finer prior austenite grain size,which results in the final microstructure refinement,the TMCP state sample shows better comprehensive mechanical properties than QT state samples.Steel plate with up to 2200 MPa strength,620 HBW hardness and 12% elongation was obtained.The results prove that this designed energy saving TMCP technique without heat treatment also leads to better mechanical properties than conventional quenching and tempering.XRD result shows that the retained austenite volume fraction of the TMCP sample is higher than WQ sample and all the QT samples.During the air cooling process after low temperature relaxation,the slow transformation of the super cooled austenite phase to martensite phase allows the partitioning of carbon from a to g phase,and that will stabilize the retained austenite to room temperature.The retained austenite content decreases with the increase of tempering temperature,and results in the decrease of the toughness and ductility of the quenched and tempered samples.In addition,the observed microstructures of all the experimental samples in this work are consisted of lath martensite and little twinning structure." @default.
• W3148248600 created "2021-04-13" @default.
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• W3148248600 date "2014-01-01" @default.
• W3148248600 modified "2023-09-26" @default.
• W3148248600 title "EFFECT OF MICROSTRUCTURE EVOLUTION ON MECHANICAL PROPERTIES OF ULTRA-HIGH STRENGTH WEAR RESISTANCE STEEL" @default.
• W3148248600 hasPublicationYear "2014" @default.
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