Effects of Tempering Temperature on Microstructure and Second Phase Precipitation Behavior of 15Cr5MoVRE Oil Well Pipe Steel
The effects of tempering temperature on the microstructure and the second phase precipitation behavior of 15Cr5MoVRE oil well pipe steel were studied.The test steel was heat-treated in a box-type heat treatment furnace.The microstructure and second phase of the tempered steel were observed and analyzed by optical microscope and transmission electron microscope.The mechanical properties of the tempered steel were tested by hardness tester and tensile testing machine.The results show that the microstructure is tempered sorbite and tempered troostite by water quenching after holding at 900℃for 50 min and tempering at 670-710℃for 90 min,the type of precipitated second phase carbide are M7C3 and M23C6 in 15Cr5MoVRE oil well pipe steel.With the increase of tempering temperature,the number and size of the second phase carbide particles increase significantly,and agglomeration occurs at 710℃.A large number of fine second phase carbides are precipitated uniformly on the ferrite matrix,and the mechanical properties of the test steel are the best when the tempering temperature is 690℃.The optimum tempering temperature is 690℃in current conditions.
15Cr5MoVRE oil well pipe steeltemperingtempered troostitetempered sorbitesecond phase
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