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加入微量的硼,铸铁具有产生第三硬化相显微组织的特点。本文对不同P、B含量的硼铸铁硬化相凝固形态的类型,以及影响硬化相类型的因素进行了探讨,提出硼铸铁因不同的P/B比值,具有三种不同凝固类型硬化相的显微组织,选用润滑磨料磨损试验得到具有第二类型硬化相显微组织的硼铸铁耐磨性最好的结论,并用金相染色法、电子探针、扫描电镜、能谱分析、X射线衍射等综合方法对不同类型硬化相进行了相分析。本文从铸铁凝固末期凝固特点的角度,分析了影响硬化相类型的因素井实验得到含0.05％B时P/B、孕育量和硬化相关系的组织图表。本研究的结论虽然是由φ20湿型试样实验所得的结果,但由于铸型冷却条件对硼铸铁凝固末期所产生硬化相的类型影响不大,故可作为不同生产条件下控制硼铸铁硬化相凝固形态类型的参考。
By adding trace amounts of boron, cast iron has the characteristic of producing a third hardened phase microstructure. In this paper, the types of hardened phases of boron cast iron with different content of P and B and the factors that influence the types of hardened phases are discussed. The results show that the microstructure of boron cast iron with three different solidification types has different microstructure due to different P / B ratio The results show that the wear resistance of boron cast iron with the second type of hardened phase microstructure is the best. The results of metallographic staining, electron probe, scanning electron microscopy, energy spectrum analysis and X-ray diffraction Methods Phase analysis of different types of hardened phases. In this paper, from the perspective of the solidification characteristics of the final solidification of cast iron, we analyzed the factors affecting the type of hardened phase and obtained the histogram of the relationship between P / B, pregnant amount and hardened phase when 0.05% B was included. Although the conclusion of this study is from the experimental results of φ20 wet specimen, the cooling condition of the mold has little effect on the type of hardened phase produced at the final stage of boron cast iron solidification. Therefore, the hardened phase of boron cast iron can be controlled under different production conditions Reference to solidification types.