Investigation on the Influence of Tempering on Microstructure and Wear Properties of High Alloy Chromium Cast Iron

IF 1.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advances in Materials Science Pub Date : 2021-06-01 DOI:10.2478/adms-2021-0011

R. Younes, Abelhamid Sadeddine, M. A. Bradai, Sahraoui Aissat, A. Benabbas

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引用次数: 2

Abstract

Abstract Mechanical properties, wear resistance and impact resistance of a high-alloy chromium cast iron used in the fabrication of grinding balls have been studied. A rank of tempering heat treatments under several temperatures 500°C, 525°C, 550°C and 575°C was performed after austenitized at 1050°C. The Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD) techniques have been used to characterize the microstructures and identify the phases. The wear balls tests were conducted in a rotating drum with a velocity 0.5 r/s. The tribological tests were carried out by evaluated a weight loss as function time. The measurement of the rebound resilience was determined by Charpy impact tests. The results of XRD showed the presence of the martensite, carbides type M7C3 and M2C for all tempering heat treated. The hardness of the sample increased after the tempering and reach nearly 65 HRC at 1050°C. In another hand, it decreased after the tempering treatment it could be explained by precipitation of the carbides type M2C.

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回火对高合金铬铸铁组织和磨损性能影响的研究

研究了一种用于制造磨球的高合金铬铸铁的力学性能、耐磨性和抗冲击性。在1050℃奥氏体化后，在500℃、525℃、550℃和575℃下进行回火热处理。利用扫描电子显微镜(SEM)和x射线衍射(XRD)技术对其微观结构进行了表征，并对相进行了鉴定。磨损球试验在速度为0.5 r/s的旋转滚筒中进行。摩擦学试验是通过评估重量损失作为功能时间来进行的。通过夏比冲击试验确定了回弹弹性的测量。XRD结果表明，所有回火热处理均存在马氏体、M7C3型和M2C型碳化物。回火后试样的硬度有所提高，在1050℃时硬度接近65 HRC。另一方面，回火后碳化物含量有所下降，这可以解释为M2C型碳化物的析出。

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来源期刊

Advances in Materials Science MATERIALS SCIENCE, MULTIDISCIPLINARY-

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7.70%

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