Effects of Quenching Temperature and Partitioning Temperature on Microstructure and Properties of Q&P980 Steel Produced by CSP Process
Q&P980 hot-rolled steel plate produced by CSP process from an iron and steel enterprise was used as the experimental object for Q&P treatment by thermal simulation testing machine.The microstructure and mechanical properties were characterized by XRD,SEM and electronic universal tensile testing machine.The results show that the bainite transformation increases when the quenching temperature is increased,with the increase of quenching temperature,the volume fraction of retained austenite(RA)and total elongation first increase and then decrease,the tensile strength gradually decrease,and the volume fraction of secondary martensite(M2)gradually increase.With the increase of partitioning temperature,the volume fraction of RA first increases and then decreases,the tensile strength gradually decreases,and the volume fraction of M2 gradually increases.The excellent mechanical properties are obtained when the quenching temperature is 345℃and the partitioning temperature is 420℃.Correspondingly,the volume fraction of RA,total elongation,tensile strength and product of tensile strength and ductility are 14.20%,22.74%,1150 MPa and 26.15 GPa·%,respectively.
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