secondary cementite

例句：

1. 1.The alloy contains a significant amount ofsecondary cementite, which can affect itsmechanical properties.
   这种合金含有大量的次要碳化物，这会影响其机械性能。
2. 2. Inthe manufacturing process, secondary cementite isoften removed to improve the quality of thefinal product.
   在制造过程中，通常会去除次要碳化物以改善最终产品的质量。
3. 3. Theresearch on secondary cementite has shownthat it plays an important role in thewear resistance of materials.
   关于次要碳化物的研究表明，它在材料耐磨性方面起着重要作用。