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Pearlite

About: Pearlite is a research topic. Over the lifetime, 6028 publications have been published within this topic receiving 65695 citations.


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Journal ArticleDOI
TL;DR: In this paper, the NiCrBSi coating was prepared on gray cast iron by plasma cladding and the microhardness, elastic modulus, tensile performance and wear performance of the cladded layer were analyzed.
Abstract: Plasma cladding has been widely applied in surface modification and repairing. In this study, the NiCrBSi coating was prepared on gray cast iron by plasma cladding. Scanning electron microscopy (SEM), energy dispersive microanalysis (EDS), X-ray diffraction (XRD) and transmission electron microscope (TEM) were used to identify the microstructure and phase types of the cladded layer, the bonding zone and the heat affected zone. The microhardness, elastic modulus, tensile performance and wear performance of the cladded layer were analyzed by the microhardness tester, nanoindentation, tensile test and wear test. The results show that typical microstructure of the cladded layer is dendrites of γ-(Fe, Ni), with interdendritic phases rich in B(Fe, Si)3, Cr15.58Fe7.4C6 and Cr7C3. The bonding zone mainly consists of martensite, retained austenite, graphite, pearlite and a small amount of carbide network, while the heat affected zone is mainly a mixed microstructure of martensite, retained austenite and graphite. The Ni-based coating presents a significantly superior microhardness, elastic modulus and tensile strength and wear performance resistance than those of the gray cast iron. In addition, elastic modulus test and tensile test show that the interface between the cladded layer and the substrate has good metallurgical bonding characteristics.

45 citations

Journal ArticleDOI
TL;DR: In this article, the authors examined the sintering behavior and properties of Fe 0.8Mn-0.5C manganese powder metallurgy steels, focusing on the influence of mode of alloying.
Abstract: This study examines the sintering behavior and properties of Fe-0.8Mn-0.5C manganese powder metallurgy steels. The study focuses on the influence of mode of alloying—admixing using either high-purity electrolytic manganese or medium carbon ferromanganese as well as the fully prealloying of water-atomized powder. Three main aspects were studied during the whole sintering process—microstructure development, interparticle necks evolution, and changes in the behavior of manganese carrier particles during both heating and sintering stages. The prealloyed powder shows considerable improvement in carbon homogenization and interparticle neck development in comparison with admixed materials. The first indication of pearlite for the fully prealloyed material was registered at ~1013 K (740 °C) in comparison with ~1098 K (825 °C) in the case of the admixed systems. The negative effect of the oxidized residuals of manganese carrier particles and high microstructure inhomogeneity, which is a characteristic feature of admixed systems, is reflected in the lower values of the mechanical properties. The worst results in this respect were obtained for the system admixed with electrolytic manganese because of more intensive manganese sublimation and resulting oxidation at lower temperatures. According to the results of X-ray photoelectron spectroscopy and high-resolution scanning electron microscopy and energy dispersive X-ray analyses, the observed high brittleness of admixed materials is connected with intergranular decohesion failure associated with manganese oxide formation on the grain boundaries.

45 citations

Journal ArticleDOI
TL;DR: In this paper, the mechanisms for the formation of pearlite in steels are reviewed with particular reference to the work of R. F. Mehl and colleagues and the role of crystallography in the early theories, and inherent in the mechanisms of Mehl et al.

45 citations

Journal ArticleDOI
TL;DR: In this article, a 2 kW CO2 laser was used to scan the steel surfaces at various rates, and the laser transformation hardening response of Fe 0.5C-0.8Mn and Fe- 0.8Cr steels was examined, and calculated and measured hardened depths yielded values of the effective coupling coefficient of the laser beam to the steel which varied as a function of beam interaction time.
Abstract: The laser transformation hardening response of Fe-0.5C-0.8Mn and Fe-0.5C-0.8Mn-0.8Cr steels was examined. A 2 kW CO2 laser was used to scan the steel surfaces at various rates. Complete transformation of pearlite to austenite, and hence to martensite, occurred in the laser heated surface layer of the Fe-C-Mn steel. During equivalent heat treatment of the Fe-C-Mn-Cr steel, incomplete austenitization of the pearlite colonies left the cementite plates largely undissolved. However, the maximum surface hardness was approximately the same for both alloys. Comparison of calculated and measured hardened depths yielded values of the effective coupling coefficient of the laser beam to the steel which varied as a function of beam interaction time. Modeling the process allowed a dis-tinction to be made between the effects of alloying elements and of pearlite spacing upon the depth of complete austenitization. In this case, the effect of the difference in pearlite spacing between the two steels was negligible. In the alloy steel, Cr and Mn were strongly partitioned to the cementite before heat treatment, and remained so after laser processing. Incomplete austenitization of that steel is attributed to partitioning of alloying elements to the cementite and their retarding influence on the diffusion controlled dissolution kinetics of the alloyed carbide.

45 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of microstructural variations, as produced by differences in heat treatment and the addition of Nb, on the mechanical properties of eutectoid pearlitic carbon steels were made.

45 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023148
2022326
2021218
2020271
2019291
2018221