In this study, the influence of multi-pass plasma remelting conditions on quantitative graphite nodules dissolution, surface hardening and wear resistance of 500-12 ductile iron was evaluated. Surface remelting was carried out at various levels of heat inputs using high-temperature plasma beams. The graphite dissolution was uniquely quantified via image analysis approach, and then the remelted surface layer was characterized for phase transformation, microstructure, hardness and wear resistance. The remelting process parameters (arc current and scanning speed) showed significant (p < 0.01) influence, both on graphite nodules dissolution and surface hardening. Consequently, microstructure of the treated layer is modified and the surface exhibited a significant improvement in hardness and wear resistance. In addition, treatment conditions having slower scanning speed showed better surface modification. Therefore, the plasma remelting enhanced surface hardness and dry sliding we...

中文翻译：

---

等离子重熔条件对500-12球墨铸铁定量石墨溶解和改性表面特性的影响

在这项研究中，评估了多次通过等离子重熔条件对定量的石墨结核溶解，表面硬化和500-12球墨铸铁的耐磨性的影响。使用高温等离子体束在各种热量输入下进行表面重熔。通过图像分析方法对石墨的溶解度进行独特的定量，然后对重熔的表面层进行相变，显微组织，硬度和耐磨性表征。重熔工艺参数（电弧电流和扫描速度）对石墨结核的溶解和表面硬化均表现出显着的影响（p <0.01）。因此，处理过的层的微观结构被改变，并且表面在硬度和耐磨性方面表现出显着的改善。此外，扫描速度较慢的处理条件显示出较好的表面改性。因此，等离子重熔提高了表面硬度和干滑性。