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研究了钨元素对Cr24高铬铸铁组织及性能的影响。试验结果表明,钨元素在碳化物和基体中均匀分布,钨的碳化物以WC1-x、W6C2.54、CW3形式存在,铬的碳化物类型以M7C3、M23C6为主。铸态下,组织为马氏体+奥氏体+碳化物。含钨量为1.0%时,硬度HRC为58～59,冲击韧度为11～12J/cm2,钨含量达到3%时,冲击韧度明显下降,含钨3%的磨损失重最少;经1050℃淬火250℃回火,含钨量为1.0%的硬度HRC为60～61,冲击韧度为8～9J/cm2,磨损失重最少。
The effect of tungsten on microstructure and properties of Cr24 high chromium cast iron was studied. The experimental results show that the tungsten is uniformly distributed in the carbide and the matrix, the tungsten carbides are in the form of WC1-x, W6C2.54 and CW3, and the carbides of chromium are mainly M7C3 and M23C6. As-cast, the organization of martensite + austenite + carbide. When the content of tungsten is 1.0%, the HRC is 58-59 and the impact toughness is 11-12J / cm2. The impact toughness decreases obviously when the content of tungsten reaches 3%. The wear loss of tungsten containing 3% Quenching at 250 ℃ tempering, tungsten content of 1.0% of the hardness HRC 60 ~ 61, impact toughness of 8 ~ 9J / cm2, wear the least weight loss.