ABSTRACT

The chilled cast iron tappet comprises three gradient microstructures, including chill, mottle, and gray iron. In this work, the effect of Tellurium (Te) on the chilled iron tappet’s microstructure and properties is studied. The addition of Te to gray cast alloy enhances its mechanical and thermal properties, which can be used in new designing of materials for heavy automotive applications. The gray cast iron alloy with 0.01 to 0.05 wt.% of Te was prepared in order to examine the effect of Te wt.% on the chill depth, microstructure, wear, and hardness. The scanning electron micrographs are used to distinguish and analyze the chill zone, mottle, and gray zone in the tappet, and the hardness was studied by Vickers hardness test, and wear behavior by a pin on disc method was measured. The present study showed that the addition of Te strongly influenced the formation of chill and efficiently enhanced the tappet’s mechanical properties along with the favorable effect to eliminate the mottled zone and separate the chill zone and gray zone with a clear boundary.

摘要

冷硬铸铁挺杆包括三种梯度显微组织，包括冷硬、斑驳和灰口铸铁。在这项工作中，碲 (Te) 对冷硬铁挺杆的微观结构和性能的影响进行了研究。在灰铸合金中添加 Te 可增强其机械和热性能，可用于重型汽车应用的新材料设计。制备具有 0.01 至 0.05 wt.% Te 的灰口铸铁合金，以检查 Te wt.% 对冷硬深度、微观结构、磨损和硬度的影响。用扫描电子显微照片区分和分析挺柱中的激冷区、斑纹和灰色区，并通过维氏硬度试验研究硬度，并通过销钉盘法测量磨损行为。