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Influence of Niobium Content on the Mechanical Properties and Abrasion Wear Resistance of Heat-Treated High-Chromium Cast Iron

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Abstract

The effect of niobium addition up to 3.4 wt% on the microstructure and mechanical properties of heat-treated high-Cr cast iron containing 13.5 wt% Cr was investigated. Niobium addition caused small hard NbC particles to precipitate within the proeutectic austenite which impede the development of austenite dendrite growth resulting in structure refinement. This austenitic matrix upon heat treatment changed to mainly martensitic one with some retained austenite and reinforced with small amounts of secondary carbides of M7C3 type. It was found that the hardness increased with increasing Nb content due to structure refinement and precipitation of hard NbC particles. These particles caused a depletion of carbon in the austenite matrix and thus most of the austenite was transformed to martensite upon heat treatment. The highest impact value was obtained for the base alloy without Nb addition which could be attributed to the high amount of retained austenite. The high-Cr cast iron alloyed with Nb in the range of 1.55–3.4 wt% showed an increase in hardness without any deterioration in toughness. The wear resistance was significantly enhanced by the presence of hard NbC particles up to 2.52 wt% Nb. Exceeding this optimum amount of addition leads to agglomeration of NbC particles and hence deterioration of the wear resistance through three body abrasion wear mechanism.

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Authors and Affiliations

  1. Central Metallurgical Research and Development Institute, (CMRDI), P.O. Box 87, Helwan-El-Tebbin, Cairo, Egypt

    Mervat Mohamed Ibrahim, Shimaa El-Hadad & Mohamed Mourad

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  1. Mervat Mohamed Ibrahim
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  2. Shimaa El-Hadad
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  3. Mohamed Mourad
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Correspondence to Mervat Mohamed Ibrahim.

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Ibrahim, M.M., El-Hadad, S. & Mourad, M. Influence of Niobium Content on the Mechanical Properties and Abrasion Wear Resistance of Heat-Treated High-Chromium Cast Iron. Inter Metalcast 15, 500–509 (2021). https://doi.org/10.1007/s40962-020-00474-7

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