铌含量对H13钢枝晶偏析及碳化物组成和形貌的影响

欧阳伟豪; 周健; 高鹏; 迟宏宵; 谢官利; 王文军

doi:10.11973/jxgccl202212007

铌含量对H13钢枝晶偏析及碳化物组成和形貌的影响

Effect of Nb Content on Dendrite Segregation and Carbide Composition and Morphology of H13 Steel

摘要

摘要: 采用真空感应炉制备含有不同质量分数(0,0.17%,0.38%)铌的H13钢,研究了铌含量对该钢枝晶偏析及共晶碳化物组成和形貌的影响。结果表明:加入铌可以显著细化H13钢的组织,并降低枝晶间碳化物形成元素的偏析;随铌含量的增多,共晶碳化物数量和尺寸显著增加,其形貌由块状或长条状向层片状或鱼骨状转变;碳化物主要为M₇C₃、M₂₃C₆、M₆C及MC,随铌含量的增多,M₇C₃和M₂₃C₆型碳化物数量减少,M₆C和MC型碳化物数量增多,MC型碳化物由以VC为主转变为以NbC和VC为主,且MC型碳化物的析出温度显著提高。

Abstract: H13 steel with different mass fractions (0,0.17%,0.38%) of Nb was prepared with vacuum induction furnace. The effect of Nb content on dendrite segregation, and eutectic carbide composition and morphology of H13 steel was studied. The results show that adding Nb could significantly refined the structure of H13 steel and reduce the segregation of the forming elements of interdendritic carbides. With the increase of Nb content, the number and size of eutectic carbides increased significantly, and their morphology changed from blocky or long strip to lamellar or fishbone. The carbides were M₇C₃, M₂₃C₆, M₆C and MC. With the increase of Nb content, the number of M₇C₃ and M₂₃C₆ type carbides decreased while the number of M₆C and MC type carbides increased; MC type carbides changed from VC to NbC and VC, and the precipitation temperature of MC type carbides increased significantly.

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