Effect of niobium-vanadium microalloying on the performance of high-carbon steel wire for needle cloth
Using direct reading spectrometers,universal testing machines,metallographic microscope and scan-ning electron microscope and other equipment,the differences between 82B and 82NbV of steel wire for needle cloth were analyzed and studied,and the influence of niobium-vanadium microalloying on the performance of high-carbon needle cloth steel 82B was investigated.The results show that:based on the addition of 0.1%V and 0.02%Nb based on 82B compositions,with Steyrmo cooling,the spitting temperature is controlled at 900℃,the roller speed is 0.9 m/s,and the phase transition temperature is above 600 degrees Celsius when air-cooled,the tensile strength of the wire can be increased from 1180 MPa to 1 260 MPa.The actual grain size of pearlite has been in-creased from level 8 to level 9.5.The layer spacing of pearlite tissue has been reduced from 150 nm to 100 nm.At the same time,a large number of(Nb、V)(C、N)precipitates are precipitated,the size is about 115 nm.Due to the addition of Nb and V,the Sorheitian phase transition temperature is reduced,the grains are refined,and the Sowrite sheet spacing is improved,and the hardening ability of steel wire drawing processing is improved.Through the rea-sonable matching of Nb and V,the surface hardness of the needle cloth steel wire is improved and the grain size of the steel wire structure is refined,and the high wear resistance of the finished needle cloth is finally realized.
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