This study focus on the effects of silicon inclusion carbonaceous particulate on the hardness and microstructural properties of carburized low carbon steel, at constant temperature of 900 °C with different holding time from 2 to 5 h. The cow bone and coal dust composite particles were varied with 20% CaCO₃ used as the energizer. Hardness and microstructural testing of the various specimens were then carried out using Vickers hardness machine and metallurgical scanning electron microscope. From the result, it was noticed that there was an increase in microhardness performance on both cow bone and coal dust reinforced matrix compared to the as-received samples. For coal dust carburized carbon steel, the hardness value improved from 286 HVN control samples 434.55 HVN in 5 h. It was seen that the introduction of cow bone composite particulate also provides a reasonable mechanical hardness improvement to 418.2 HVN although a little short fall against the coal dust metal matrix. From the microstructure and macrostructure studies highly pearlitic matrix steel was observed with grain refinement of CB and CD found at the interface providing an effective nucleation site along the boundaries.

中文翻译：

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硅夹杂物含碳复合颗粒对低碳钢热老化特性和力学性能的影响

这项研究的重点是在900°C的恒定温度下2到5 h的不同保持时间下，夹杂硅碳质颗粒对渗碳低碳钢的硬度和显微组织性能的影响。用20％CaCO ₃改变牛骨和煤尘复合颗粒用作激励器。然后使用维氏硬度计和冶金扫描电子显微镜对各种样品进行硬度和显微组织测试。从结果可以看出，与原样相比，牛骨和煤粉增强基体的显微硬度性能都有所提高。对于煤尘渗碳碳钢，在5小时内从286个HVN对照样品434.55 HVN改善了硬度值。可以看出，加入牛骨复合颗粒还可以使机械硬度提高到418.2 HVN，尽管相对于煤尘金属基质有少许下降。