The Experts below are selected from a list of 201 Experts worldwide ranked by ideXlab platform
M. Saadatmand - One of the best experts on this subject based on the ideXlab platform.
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The Optimization of Interlamellar Spacing in a Nanopearlitic Lead-Patented Hypoeutectoid Steel Wire
Journal of Materials Engineering and Performance, 2011Co-Authors: J. Aghazadeh Mohandesi, M. SaadatmandAbstract:In this study, in order to optimize the interlamellar spacing prior to drawing operation in a nanopearlitic lead patented Hypoeutectoid Steel wire, a model based on finite element method is presented to predict the optimum immersion time in a lead bath. A typical suitable immersion time for the wire with 1.8 mm diameter is about 10 s. The austenitizing and quenching temperature for a wire with diameter of 1.8 mm and composition of 0.72% C, to obtain the lowest interlamellar spacing (i.e., 29 nm), are 910 and 510 °C, respectively. The hardness and the yield strength of the Steel wire followed a linear relationship with the inverse square root of the interlamellar spacing ( S ^−1/2). Pearlite interlamellar spacing obtained after patenting treatment, was decreased by increasing the amount of prior deformation.
Leyu Zhou - One of the best experts on this subject based on the ideXlab platform.
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transformation conditions microstructures mechanical properties relationship in 0 60 c Hypoeutectoid Steel
Steel Research International, 2011Co-Authors: Chaolei Zhang, Leyu ZhouAbstract:The relationship between transformation conditions, microstructures and mechanical properties were investigated on a 0.60%C Hypoeutectoid Steel, which has predominantly pearlitic microstructure. The Steel had been austenized at 850-1050 °C and then isothermally transformed at 570-660 °C. Afterwards, the microstructures were analyzed by optical microscope, scanning electron microscope, and quantitative metallography. And the mechanical properties were determined. The results indicated that the interlamellar spacing, the pearlitic colony size and the proeutectoid ferrite content follow a linear relationship with the reciprocal of the undercooling, and the strength, the hardness and the toughness follow a Hall-Petch type of relationship with the inverse of the square root of the interlamellar spacing. Besides, the stress condition should be taken into account during analyzing the effect of the interlamellar spacing on the mechanical properties. The results have been explained on the basis of transformation conditions - microsturctures - mechanical properties ralationship.
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Transformation Conditions ‐ Microstructures ‐ Mechanical Properties Relationship in 0.60%C Hypoeutectoid Steel
Steel Research International, 2011Co-Authors: Chaolei Zhang, Leyu ZhouAbstract:The relationship between transformation conditions, microstructures and mechanical properties were investigated on a 0.60%C Hypoeutectoid Steel, which has predominantly pearlitic microstructure. The Steel had been austenized at 850-1050 °C and then isothermally transformed at 570-660 °C. Afterwards, the microstructures were analyzed by optical microscope, scanning electron microscope, and quantitative metallography. And the mechanical properties were determined. The results indicated that the interlamellar spacing, the pearlitic colony size and the proeutectoid ferrite content follow a linear relationship with the reciprocal of the undercooling, and the strength, the hardness and the toughness follow a Hall-Petch type of relationship with the inverse of the square root of the interlamellar spacing. Besides, the stress condition should be taken into account during analyzing the effect of the interlamellar spacing on the mechanical properties. The results have been explained on the basis of transformation conditions - microsturctures - mechanical properties ralationship.
J. Aghazadeh Mohandesi - One of the best experts on this subject based on the ideXlab platform.
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The Optimization of Interlamellar Spacing in a Nanopearlitic Lead-Patented Hypoeutectoid Steel Wire
Journal of Materials Engineering and Performance, 2011Co-Authors: J. Aghazadeh Mohandesi, M. SaadatmandAbstract:In this study, in order to optimize the interlamellar spacing prior to drawing operation in a nanopearlitic lead patented Hypoeutectoid Steel wire, a model based on finite element method is presented to predict the optimum immersion time in a lead bath. A typical suitable immersion time for the wire with 1.8 mm diameter is about 10 s. The austenitizing and quenching temperature for a wire with diameter of 1.8 mm and composition of 0.72% C, to obtain the lowest interlamellar spacing (i.e., 29 nm), are 910 and 510 °C, respectively. The hardness and the yield strength of the Steel wire followed a linear relationship with the inverse square root of the interlamellar spacing ( S ^−1/2). Pearlite interlamellar spacing obtained after patenting treatment, was decreased by increasing the amount of prior deformation.
Patrick M. Kelly - One of the best experts on this subject based on the ideXlab platform.
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The morphology and formation mechanism of pearlite in Steels
Materials Characterization, 2009Co-Authors: Mingxing Zhang, Patrick M. KellyAbstract:A number of morphological features of pearlite were revealed through scanning electron microscopy using deeply etched specimens. These include cementite branching, bridging, gaps, holes and curvature. The presence of cementite thin films or networks along the austenite grain boundaries in eutectoid Steel and at the interface between pearlite and proeutectoid ferrite in Hypoeutectoid Steel is another characteristic of pearlite. Further-more, ferrite thin films surrounding the proeutectoid cementite in hypereutectoid Steels are also observed. Hence, it is considered that in Hypoeutectoid Steels the nucleus for pearlite is a film of cementite rather than the expected proeutectoid ferrite and, similarly, in hypereutectoid Steels pearlite forms from a ferrite film rather than from proeutectoid cementite. Convergent beam Kikuchi line diffraction was used to accurately determine the orientation relationships between pearlitic constituents and parent austenite in a Hadfields Steel. The results show that neither the pearlitic ferrite nor the cementite is crystallographically related to the austenite grain into which the pearlite was growing and to that into which it was not growing. in addition, a new orientation relationship between pearlitic cementite and ferrite in the Hadfield Steel was also observed. It is: ((1) over bar 03)(Z)parallel to((1) over bar 01)(F) [010](Z)parallel to 131](F) [311](Z)8.5 degrees from [1 (1) over bar1](F)
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Accurate orientation relationships between ferrite and cementite in pearlite
Scripta Materialia, 1997Co-Authors: Mingxing Zhang, Patrick M. KellyAbstract:In most previous work, the interlamellar interface between pearlitic ferrite and cementite is considered to have a low energy and dislocations have been observed at the interfacial boundary, in both plain carbon Steels and high manganese Steels. Here, four new orientation relationships (ORs) between pearlitic ferrite and cementite have been determined using the more accurate CBKLDP technique. In eutectoid Steel the pearlite obeys the New-2, New-3 and New-4 ORs; in Hypoeutectoid Steel only the Isaichev OR is observed; in hypereutectoid Steel the New-5 OR is followed. The two widely accepted ORs, the Pitsch-Petch OR and the Bagaryatskii OR have never been observed. They probably do not exist.
Chaolei Zhang - One of the best experts on this subject based on the ideXlab platform.
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transformation conditions microstructures mechanical properties relationship in 0 60 c Hypoeutectoid Steel
Steel Research International, 2011Co-Authors: Chaolei Zhang, Leyu ZhouAbstract:The relationship between transformation conditions, microstructures and mechanical properties were investigated on a 0.60%C Hypoeutectoid Steel, which has predominantly pearlitic microstructure. The Steel had been austenized at 850-1050 °C and then isothermally transformed at 570-660 °C. Afterwards, the microstructures were analyzed by optical microscope, scanning electron microscope, and quantitative metallography. And the mechanical properties were determined. The results indicated that the interlamellar spacing, the pearlitic colony size and the proeutectoid ferrite content follow a linear relationship with the reciprocal of the undercooling, and the strength, the hardness and the toughness follow a Hall-Petch type of relationship with the inverse of the square root of the interlamellar spacing. Besides, the stress condition should be taken into account during analyzing the effect of the interlamellar spacing on the mechanical properties. The results have been explained on the basis of transformation conditions - microsturctures - mechanical properties ralationship.
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Transformation Conditions ‐ Microstructures ‐ Mechanical Properties Relationship in 0.60%C Hypoeutectoid Steel
Steel Research International, 2011Co-Authors: Chaolei Zhang, Leyu ZhouAbstract:The relationship between transformation conditions, microstructures and mechanical properties were investigated on a 0.60%C Hypoeutectoid Steel, which has predominantly pearlitic microstructure. The Steel had been austenized at 850-1050 °C and then isothermally transformed at 570-660 °C. Afterwards, the microstructures were analyzed by optical microscope, scanning electron microscope, and quantitative metallography. And the mechanical properties were determined. The results indicated that the interlamellar spacing, the pearlitic colony size and the proeutectoid ferrite content follow a linear relationship with the reciprocal of the undercooling, and the strength, the hardness and the toughness follow a Hall-Petch type of relationship with the inverse of the square root of the interlamellar spacing. Besides, the stress condition should be taken into account during analyzing the effect of the interlamellar spacing on the mechanical properties. The results have been explained on the basis of transformation conditions - microsturctures - mechanical properties ralationship.