Cementite

IF 16.8 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
H. K. D. H. Bhadeshia
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引用次数: 66

Abstract

ABSTRACT Cementite occurs in steels, in meteorites, possibly at the core of the Earth and has uses in its pure form. It's composition can deviate from , but not by much because the Fe–C bond contributes to its cohesion. Its crystallographic unit cell is orthorhombic and primitive, with large lattice parameters, explaining its hardness. Many of its properties are anisotropic. Its single-crystal elastic properties have been investigated using first-principles calculations and by clever experiments. The iron atoms in the cell occupy two types of positions with different point symmetries; the four carbon atoms lodge within prismatic interstices. The structure can develop defects such as dislocations, faults and vacancies. Cementite is metallic and ferromagnetic with a Curie temperature of about 187C. When alloyed, metallic solutes substitute on to the iron sites; smaller atoms such as boron replace carbon at interstitial sites. This review focuses on cementite as a single phase.
硬质合金
渗碳体存在于钢中,陨石中,可能在地球的核心,并以其纯净的形式使用。它的组成可以偏离,但不会偏离太多,因为Fe-C键有助于它的内聚力。其晶胞为正交原始晶胞,晶格参数大,硬度高。它的许多性质是各向异性的。利用第一性原理计算和巧妙的实验研究了它的单晶弹性特性。电池中的铁原子占据两种不同点对称性的位置;四个碳原子位于棱柱间隙内。该结构可产生位错、断层和空位等缺陷。渗碳体是金属和铁磁性的,居里温度约为187℃。当合金化时,金属溶质取代铁的位置;较小的原子,如硼,在间隙位置取代碳。这篇综述的重点是渗碳体作为单相。
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来源期刊
International Materials Reviews
International Materials Reviews 工程技术-材料科学:综合
CiteScore
28.50
自引率
0.00%
发文量
21
审稿时长
6 months
期刊介绍: International Materials Reviews (IMR) is a comprehensive publication that provides in-depth coverage of the current state and advancements in various materials technologies. With contributions from internationally respected experts, IMR offers a thorough analysis of the subject matter. It undergoes rigorous evaluation by committees in the United States and United Kingdom for ensuring the highest quality of content. Published by Sage on behalf of ASM International and the Institute of Materials, Minerals and Mining (UK), IMR is a valuable resource for professionals in the field. It is available online through Sage's platform, facilitating convenient access to its wealth of information. Jointly produced by ASM International and the Institute of Materials, Minerals and Mining (UK), IMR focuses on technologies that impact industries dealing with metals, structural ceramics, composite materials, and electronic materials. Its coverage spans from practical applications to theoretical and practical aspects of material extraction, production, fabrication, properties, and behavior.
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