碳含量对铌微合金化高碳钢制金属针布耐磨性的影响

Effect of carbon content on wear resistance of metal clothing made of Nb microalloyed high carbon steel

通过微合金原理,设计了3种含0.8%~1.0%碳及0.03%~0.04%铌的高碳钢。结果表明,碳含量增加可完全消除网状渗碳体,并使更多的碳在热处理加热时固溶于奥氏体中,从而获得更高的淬火硬度。对比不同碳含量钢的淬火显微组织,当碳含量为0.90%时,马氏体基体可以在获得最高硬度的同时保持超细晶粒。由此制造的梳理针布的平均齿尖硬度可以达到841 HV0.2,晶粒度可以达到13.5级。通过快速磨损试验以及客户现场试验,针布的耐磨性相对于高端针布钢材80WV提高约30%。

Based on the principle of microalloying, three types of high carbon steels containing 0.8%-1.0% C and 0.03%-0.04%Nb were designed. The results show that the increase of carbon content can completely eliminate the network cementite and make more carbon dissolve in austenite during heat treatment, so as to obtain higher quenching hardness. The comparison of quenching microstructure of steels with different carbon content shows that when the carbon content is 0.90%, the martensitic matrix can obtain the highest hardness while keep the extreme fine grain size. The card clothing made of this type of steel can reach an average hardness of 841 HV0.2 with grain size grade of 13.5. The wear resistance increases by about 30% compared with standard high-end steel 80 WV applied to card clothing through quick wear tests and online tests in real carding machines.