scholarly journals Effects of Mn on Isothermal Transformation Microstructure and Tensile Properties in Medium- and High-carbon Steels

2019 ◽  
Vol 59 (9) ◽  
pp. 1667-1675
Author(s):  
Hayato Ishigami ◽  
Nobuo Nakada ◽  
Takuya Kochi ◽  
Shigenobu Nanba
Keyword(s):  
Tensile Properties ◽  
Isothermal Transformation ◽  
Carbon Steels ◽  
High Carbon

scholarly journals Modeling And Characterization Of High Carbon Nanobainitic Steels

2021 ◽  
Author(s):  
Gaganpreet Sidhu
Keyword(s):  
Heat Treatment ◽  
Yield Strength ◽  
Volume Fraction ◽  
Isothermal Transformation ◽  
Carbon Steels ◽  
Bainitic Transformation ◽  
Analytical Models ◽  
Isothermal Heat Treatment ◽  
Compression Tests ◽  
High Carbon

Analytical models have been developed for the transformation kinetics, microstructure analysis and the mechanical properties in bainitic steels. Three models are proposed for the bainitic transformation based on the chemical composition and the heat treatment conditions of the steel as inputs: (1) thermodynamic model on kinetics of bainite transformation, (2) improved thermo-statistical model that eliminates the material dependent empirical constants and (3) an artificial neural network model to predict the volume fraction of bainite. Neural networks have also been used to model the hardness of high carbon steels, subjected to isothermal heat treatment. Collectively, for a steel of given composition and subjected to a particular isothermal heat treatment, the models can be used to determine the volume fraction of bainitic phase and the material hardness values. The models have been extensively validated with the experimental data from literature as well as from three new high carbon experimental steels with various alloying elements that were used in the present work. For these experimental steels, data on the volume fraction of phases (via X-ray diffraction), yield strength (via compression tests) and hardness were obtained for various combinations of isothermal heat treatment times and temperatures. The heat treated steels were subjected to compression and hardness tests and the data have been used to develop a new correlation between the yield stress and the hardness. It was observed that while all three experimental steels exhibit a predominantly nanostructured bainite microstructure, the presence of Co and Al in one of the steels accelerated and maximized the nano-bainitic transformation within a reasonably short isothermal transformation time. Excellent yield strength (>1.7 GPa) and good deformability were observed in this steel after isothermal heat treatment at a low temperature of 250C for a relatively short duration of 24 hours.

scholarly journals Modeling And Characterization Of High Carbon Nanobainitic Steels

2021 ◽  
Author(s):  
Gaganpreet Sidhu
Keyword(s):  
Heat Treatment ◽  
Yield Strength ◽  
Volume Fraction ◽  
Isothermal Transformation ◽  
Carbon Steels ◽  
Bainitic Transformation ◽  
Analytical Models ◽  
Isothermal Heat Treatment ◽  
Compression Tests ◽  
High Carbon

Analytical models have been developed for the transformation kinetics, microstructure analysis and the mechanical properties in bainitic steels. Three models are proposed for the bainitic transformation based on the chemical composition and the heat treatment conditions of the steel as inputs: (1) thermodynamic model on kinetics of bainite transformation, (2) improved thermo-statistical model that eliminates the material dependent empirical constants and (3) an artificial neural network model to predict the volume fraction of bainite. Neural networks have also been used to model the hardness of high carbon steels, subjected to isothermal heat treatment. Collectively, for a steel of given composition and subjected to a particular isothermal heat treatment, the models can be used to determine the volume fraction of bainitic phase and the material hardness values. The models have been extensively validated with the experimental data from literature as well as from three new high carbon experimental steels with various alloying elements that were used in the present work. For these experimental steels, data on the volume fraction of phases (via X-ray diffraction), yield strength (via compression tests) and hardness were obtained for various combinations of isothermal heat treatment times and temperatures. The heat treated steels were subjected to compression and hardness tests and the data have been used to develop a new correlation between the yield stress and the hardness. It was observed that while all three experimental steels exhibit a predominantly nanostructured bainite microstructure, the presence of Co and Al in one of the steels accelerated and maximized the nano-bainitic transformation within a reasonably short isothermal transformation time. Excellent yield strength (>1.7 GPa) and good deformability were observed in this steel after isothermal heat treatment at a low temperature of 250C for a relatively short duration of 24 hours.

Precipitation at the transformation interface of pearlite in steel

1990 ◽  
Vol 48 (4) ◽  
pp. 912-913
Author(s):  
F. A. Khalid ◽  
D. V. Edmonds
Keyword(s):  
Thin Foil ◽  
Carbon Steels ◽  
Model Alloy ◽  
Low Carbon ◽  
High Carbon ◽  
Growth Interface ◽  
Medium Carbon ◽  
Interphase Precipitation ◽  
Solution Treated ◽  
Wide Range

The austenite/pearlite growth interface in a model alloy steel (Fe-1lMn-0.8C-0.5V nominal wt%) is being studied in an attempt to characterise the morphology and mechanism of VC precipitation at the growth interface. In this alloy pearlite nodules can be grown isothermally in austenite that remains stable at room temperature thus facilitating examination of the transformation interfaces. This study presents preliminary results of thin foil TEM of the precipitation of VC at the austenite/ferrite interface, which reaction, termed interphase precipitation, occurs in a number of low- carbon HSLA and microalloyed medium- and high- carbon steels. Some observations of interphase precipitation in microalloyed low- and medium- carbon commercial steels are also reported for comparison as this reaction can be responsible for a significant increase in strength in a wide range of commercial steels.The experimental alloy was made as 50 g argon arc melts using high purity materials and homogenised. Samples were solution treated at 1300 °C for 1 hr and WQ. Specimens were then solutionised at 1300 °C for 15 min. and isothermally transformed at 620 °C for 10-18hrs. and WQ. Specimens of microalloyed commercial steels were studied in either as-rolled or as- forged conditions. Detailed procedures of thin foil preparation for TEM are given elsewhere.

DUCTLIRON

Alloy Digest ◽  
1964 ◽  
Vol 13 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Ductility ◽  
High Carbon ◽  
Ferrous Material

Abstract DUCTLIRON is a high-carbon ferrous material containing graphite in the form of nodules or spheroids. It possesses unusually high ductility, strength and castability. It is furnished in three different grades, namely, SF-60, SP-80 and SH-100. Alloyed grades are also available under different designations as AQS-HS and WS. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on casting, heat treating, machining, and joining. Filing Code: CI-33. Producer or source: Rosedale Foundry.

AISI C1060

Alloy Digest ◽  
1969 ◽  
Vol 18 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Alloy Steel ◽  
Heat Treating ◽  
Spring Steel ◽  
High Carbon ◽  
Steel Mills

Abstract AISI C1060 is a high-carbon water or oil hardening tool and spring steel recommended for heavy machinery parts, shafts, springs and miscellaneous tools requiring strength and wear resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as heat treating, machining, and joining. Filing Code: CS-32. Producer or source: Carbon and alloy steel mills.

UNS G10600

Alloy Digest ◽  
1991 ◽  
Vol 40 (3) ◽  
Keyword(s):  
Fracture Toughness ◽  
Carbon Steel ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Carbon Steel ◽  
Heat Treating ◽  
High Carbon ◽  
Steel Mills

Abstract UNS No. G 10600 is a high-carbon steel of low hardenability. It may be used in the as-rolled, annealed, normalized or quenched and-tempered condition, depending on the desired properties. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: CS-129. Producer or source: Carbon steel mills.

RED STAR TUNGSTEN

Alloy Digest ◽  
1965 ◽  
Vol 14 (12) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Cutting Tools ◽  
High Hardness ◽  
Heat Treating ◽  
High Carbon ◽  
Steel Company ◽  
Vanadium Alloys ◽  
Alloy Tool ◽  
Thread Rolling

Abstract Red Star Tungsten is a high-carbon low-alloy tool steel having high hardness, good toughness, and keen cutting edge. It is recommended for cutting tools, thread rolling dies, paper knives, etc. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as deformation. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-173. Producer or source: Vanadium Alloys Steel Company.

AISI 8660

Alloy Digest ◽  
1965 ◽  
Vol 14 (6) ◽  
Keyword(s):  
Tensile Properties ◽  
Alloy Steel ◽  
High Hardness ◽  
Heat Treating ◽  
Molybdenum Alloy ◽  
High Carbon ◽  
Steel Mills

Abstract AISI 8660 is a high carbon, chromium-nickel-molybdenum alloy steel having high hardness and strength, suitable for springs and axle shafts. This datasheet provides information on composition, hardness, and tensile properties. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-178. Producer or source: Alloy steel mills and foundries.

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