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在国标高铬铸铁Cr26的基础上,开发了新型的超高铬铸铁(铬含量约37%)。采用扫描电镜和X射线衍射仪对超高铬铸铁的显微组织进行分析,并对材料的硬度及冲击韧性进行了研究。在H3PO4介质条件下,利用MCF-30型腐蚀磨损试验机,研究了超高铬铸铁的腐蚀磨损性能。结果表明,超高铬铸铁中的碳化物类型为M7C3和M23C6,基体为马氏体和残余奥氏体。随着碳含量的增加,超高铬铸铁的硬度先增加而后降低,冲击韧性逐渐降低,超高铬铸铁的腐蚀磨损性能逐渐降低。超高铬铸铁的耐腐蚀磨损性能明显优于Cr26铸铁,其相对耐磨性最高为Cr26的3倍以上。
Based on the national standard high chromium cast iron Cr26, a new type of ultra-high chromium cast iron (about 37% chromium) has been developed. The microstructure of ultra-high chromium cast iron was analyzed by scanning electron microscopy and X-ray diffraction. The hardness and impact toughness of the material were also studied. In the H3PO4 medium conditions, the use of MCF-30-type corrosion wear tester, the corrosion of ultra-high chromium cast iron performance. The results show that the carbide types of ultra-high chromium cast iron are M7C3 and M23C6, and the matrix is martensite and retained austenite. With the increase of carbon content, the hardness of ultra-high chromium cast iron first increases and then decreases, the impact toughness decreases gradually, and the corrosion and wear properties of ultra-high chromium cast iron decrease gradually. Ultra-high chromium cast iron corrosion resistance and wear resistance significantly better than Cr26 cast iron, the relative wear resistance up to 3 times more than Cr26.