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Use of slag containing water as a lubricant in high straining rolling for ultrafine-grained steels

机译：在高应变轧制中使用含水矿渣作为润滑剂用于超细晶粒钢

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We investigated the possibility of using waste slag as a lubricant in high straining rolling for ultrafine-grained steels. When slag is applied as a lubricant, it might satisfy the requirement for stable biting work-pieces because slag is as stable as glass with high hardness at the biting temperatures in rolling (100-200 deg C). On the other hand, ordinary slag doesn't have the fluidity necessary to provide a lubricating effect at rolling temperatures of 300-400 deg C since its melting temperature is usually high. However, slag containing water has been targeted as a new lubricant, and we focused on lowering the glass transition temperature and the structural change of slag containing water with the aim of improving the lubricity of slag in rolling. The microstructures of slag containing water and slag that released water were observed in the present study, along with in-situ observation of water released from the surface of slag containing water were conducted after heating in a SiO_2-Na_2O-B_2O_3 slag system. We found that water was mainly contained in the phase formed by ions dissolved from the original slag under hydrothermal conditions, and the amount of water was dependent on the state of the phase, such as glass or crystal. It was confirmed that slag containing water could provide a lubricating effect when the water is released from the slag above the glass transition temperature because a porous structure is formed due to the water release.
机译：我们研究了在超细晶粒钢的高应变轧制中使用废渣作为润滑剂的可能性。当将炉渣用作润滑剂时，由于炉渣在轧制的咬合温度（100-200℃）下与高硬度玻璃一样稳定，因此可以满足稳定的咬合工件的要求。另一方面，普通炉渣在300-400℃的轧制温度下不具备提供润滑作用所必需的流动性，因为它的熔化温度通常很高。但是，以水渣为对象的新型润滑剂，为了提高轧制中的渣的润滑性，着眼于降低玻璃化转变温度和水渣的结构变化。在SiO_2-Na_2O-B_2O_3炉渣体系中加热后，观察了炉渣的微观结构和放出水分的炉渣，并进行了从炉渣表面释放的水的原位观察。我们发现，水热条件下，水主要包含在从原矿渣中溶解的离子形成的相中，水的量取决于相的状态，例如玻璃或晶体。已经证实，当水从玻璃化转变温度以上的炉渣中释放出来时，含水的炉渣可以提供润滑作用，这是因为由于水的释放形成了多孔结构。

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