Abstract As-cast white cast iron specimens with chromium concentrations of 0, 2, and 4 wt% were prepared by melting and casting. Scanning electron microscopy and X-ray diffractometry results indicate that the composite phase consists of a hard phase (cementite) and a toughness matrix (pearlite) with a 28.8 ± 2% cementite volume fraction, which is a typical hypoeutectic structure. The cementite and pearlite microhardness increased with a higher chromium content. The maximum cementite microhardness was 1,054.23 HV. Two-body abrasive wear was measured under a higher impact load using a pin-on-disc tribometer. The effect of chromium content on the wear behavior of the cementite groove depth and width, roughness, chip peel off on the worn surfaces, and mass loss were investigated at an applied pressure of 1.83 MPa. With increasing Cr content, the roughness and mass loss decreased by 10.7 and 15.9%, respectively, and the wear resistance increased visibly. The break in abrasive SiO2 resulted in abrasive tip passivation during wear. As a result, the ratio of the depth–width of the parallel groove and the length–width of the worn chip decreased significantly.

中文翻译：

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不同铬浓度白口铸铁的双体磨损行为表征

摘要 通过熔炼和铸造制备铬浓度为 0、2 和 4 wt% 的铸态白口铸铁试样。扫描电镜和X射线衍射结果表明复合相由硬相（渗碳体）和韧性基体（珠光体）组成，渗碳体体积分数为28.8±2%，是典型的亚共晶结构。渗碳体和珠光体显微硬度随着铬含量的增加而增加。最大渗碳体显微硬度为 1,054.23 HV。使用销盘式摩擦计在较高冲击载荷下测量双体磨料磨损。在 1.83 MPa 的施加压力下，研究了铬含量对渗碳体凹槽深度和宽度、粗糙度、磨损表面的切屑脱落和质量损失的磨损行为的影响。随着 Cr 含量的增加，粗糙度和质量损失分别降低了10.7%和15.9%，耐磨性明显提高。磨料 SiO2 的断裂导致磨损期间磨料尖端钝化。结果，平行槽的深宽比与磨损切屑的长宽比显着降低。