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Wear Resistant in Situ MMC Sintered with FeBC Liquid Phase

机译：FeBC液相烧结的耐磨MMC

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Powder metallurgy represents a good alternative to a conventional casting process to produce wear resistant materials. MMC (metal matrix composite) of a hardenable steel matrix and hard phases compacted by hot isostatic pressing (HIP) are highly wear resistant but high in price. In the present study liquid phase sintering was preferred to HIP and expensive hard phases as tungsten carbides were replaced by ferrotitanium particles (FeTi) to reduce costs. A mixture of gas atomized hot work steel powder of < 150 urn in size, hypereutectic FeBC powder of < 36 μm in size as liquid phase donor (LPD) and ferrotitanium particles (100-150 μm in size) with about 70 mass% of Ti was sintered in vacuum to give a wear resistant MMC of full density. However, the elements B and C from LPD diffused to the steel powder before the liquid phase appeared. Therefore these two powders merged into a near-eutectic or hypoeutectic constitution. The LPD was diluted by the steel. During sintering the ferrotitanium particles are transformed in situ into hard phases (in situ HP) with a Fe-rich core surrounded by a hard TiC case to withstand abrasive wear. Numerous investigations by LOM, SEM with EDX, WDX and DTA were realized step by step for a deeper understanding of what happens in the initial three-component mixture during liquid phase sintering and how the in situ MMC forms. The resistance to wear was measured by pin-on-plate tests against abrasive paper of different hardness and mesh size and compared with HIP-MMC and SLPS-MMC.
机译：粉末冶金是生产耐磨材料的传统铸造工艺的良好替代品。 MMC（金属基复合材料）是一种可硬化的钢基体，通过热等静压（HIP）压实的硬相具有很高的耐磨性，但价格昂贵。在本研究中，液相烧结优于HIP且昂贵的硬质相，因为碳化钨被钛铁颗粒（FeTi）代替以降低成本。尺寸小于150微米的气体雾化热作钢粉末，尺寸小于36μm的过共晶FeBC粉末作为液相供体（LPD）和钛铁颗粒（尺寸100-150μm）的混合物，其中钛含量约为70质量％将其在真空中烧结以得到全密度的耐磨MMC。但是，LPD中的元素B和C在液相出现之前扩散到了钢粉中。因此，这两种粉末合并成近共晶或亚共晶的成分。 LPD用钢稀释。在烧结过程中，铁钛合金颗粒原位转变为硬相（原位HP），富铁芯被硬TiC外壳包围，可以承受磨料磨损。 LOM，带有EDX，WDX和DTA的SEM逐步进行了许多研究，以便更深入地了解液相烧结过程中初始三组分混合物中发生了什么以及原位MMC是如何形成的。通过对不同硬度和筛孔尺寸的砂纸进行针-板试验来测量耐磨性，并将其与HIP-MMC和SLPS-MMC进行比较。

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