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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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15 Oct 2010-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, a procedure for mapping the major influential factors, which influence the material behavior, on the constituents of a micromechanical model is established, which involves the classification of the experimentally observed influential factors that influence the aggregate behavior into influential groups.
Abstract: In developing micromechanical models, boundary conditions and material behavior of each constituent of the aggregate need to be described correctly. Mapping the major factors which realistically influence the aggregate behavior on the micromechanical model is crucial in the development of micro-models. This is being done blindly, as many crucial factors which influence the aggregate behavior are not considered in the development of micromechanical models for ferrite-pearlite steels. In this work, a procedure for mapping the major influential factors, which influence the material behavior, on the constituents of a micromechanical model is established. This procedure involves the classification of the experimentally observed influential factors which influence the aggregate behavior into influential groups that can be mapped or reflected on the micromechanical model constituents. This achieves the bridging between the experimentally observed influential factors and the approach by which these factors can be captured by the micromechanical model. The single ferrite and pearlite phases are developed experimentally from which the phase behaviors can be produced easily. It is demonstrated that the factors considered in this work significantly affect the micromechanical model responses. It is also shown that the micromechanical model is capable of capturing the general behavior of ferrite-pearlite dual phase steels.
31 citations
TL;DR: In this paper, the microstructural characterization and formation mechanism of abnormal segregation band of hot rolled ferrite/pearlite steel was intensively studied with Scanning Auger Microprobe (SAM), etc.
31 citations
TL;DR: In this paper, high-resolution neutron diffractometry was used to determine the dependence of the lattice parameters on temperature, which can be subject to systematic errors arising from specimen height misalignments, and temperature inhomogeneities.
31 citations
TL;DR: In this article, a high-temperature confocal scanning laser microscope was used to determine the mechanisms of transformation of austenite/ferrite interfaces in the ferrite regions of an alloy steel, with a ferrite/pearlite microstructure.
Abstract: Migrating austenite/ferrite interfaces in the ferrite regions of an alloy steel, containing 0.20 wt pct C, 0.87 wt pct Mn, and 0.57 wt pct Cr, with a ferrite/pearlite microstructure have been observed during austenitization by a high-temperature confocal scanning laser microscope in order to determine the mechanisms of transformation. The samples were subjected to isothermal (790 °C to 850 °C) and nonisothermal (0.5 °C to 20 °C/s) temperature profiles. The kinetic rates extracted from the observations were compared to models for long-range diffusion-controlled and interface reaction-controlled migration. The transition between the two mechanisms was found to occur at T
0, which defines the temperature and composition at which a partitionless phase transformation is possible. Occurrence of the partitionless, interface-controlled transformation was confirmed by an analysis of carbon distribution and microstructure before and after a sample was subjected to a particular thermal profile. The mobility of such interfaces was found to be in the range 1.6·10−13 to 2·10−12 m4·J−1·s−1, which is consistent with previous studies on interface-controlled migration of the reverse reaction, α to γ, during cooling of dilute substitutional iron alloys. The diffusion-controlled migration, at temperatures below T
0, was found to occur in two stages: an initial stage, at which the growth rate can be predicted by a semi-infinite diffusion model; and a second stage, at which the growth slows more rapidly, possibly due to the overlap of diffusion fields.
31 citations
TL;DR: In this article, an investigation into the relation between magnetic and metallurgical properties of 26 types of high-strength constructional steel was reported, and an independent correlation between coercivity, grain size and relative pearlite and ferrite fractions was also found.
Abstract: An investigation into the relation between magnetic and metallurgical properties of 26 types of high-strength constructional steel is reported. Correlation between chemical composition and coercive field was found. An independent correlation between coercivity, grain size and relative pearlite and ferrite fractions was also found. The coercivity and initial permeability varied with ultimate tensile strength but Vickers hardness measurements were not found to be a reliable method of predicting coercivity over the hardness range found in the sample set. For a larger hardness range, produced by heat treating one steel type, an excellent linear relationship was found between hardness and coercivity.
31 citations