Special features of the ? ? ? transformation in powder carbon steels

1996 ◽  
Vol 38 (3) ◽  
pp. 112-114
Author(s):  
V. N. Antsiferov ◽  
L. M. Grevnev ◽  
O. M. Perel'man
Keyword(s):  
Carbon Steels ◽  
Powder Carbon Steels

scholarly journals On Increasing Powder Carbon Steels Properties Using Activating Additives

2020 ◽  
Vol 25 (2) ◽  
pp. 192-201
Author(s):  
L. Dyachkova
Keyword(s):  
Mechanical Properties ◽  
Sodium Bicarbonate ◽  
Diffusion Rate ◽  
Sintering Temperature ◽  
Carbon Diffusion ◽  
Carbon Steels ◽  
Sintering Process ◽  
Activating Additives ◽  
Homogeneous Structures ◽  
Powder Carbon Steels

AbstractIn this paper, the possibility of increasing powder carbon steels properties by activation of carbon diffusion into the iron base during sintering process due to the introduction of the thermally split graphite (TSG), macromolecular compounds (MC) and sodium bicarbonate was investigated. It was found that the introduction of these additives allows obtaining homogeneous structures at a sintering temperature of 100–200 °C lower than that traditionally used for sintering of powder carbon steels. Such structures provide increased mechanical properties of powder carbon steels. The addition of sodium bicarbonate increases the diffusion rate of carbon into iron at a temperature of 950 C by 1.8 times, at 1000 °C by 1.5 times, and at 1100 °C by 1.2 times.

Formation of Crystal Structure in Hot Forging of Powder Carbon Steels

2020 ◽  
Vol 59 (3-4) ◽  
pp. 232-238
Author(s):  
A.A. Mamonova ◽  
G.A. Bagliuk
Keyword(s):  
Crystal Structure ◽  
Hot Forging ◽  
Carbon Steels ◽  
Powder Carbon Steels

scholarly journals Determination of the limiting values of the laser parameters to heat treatment of powder carbon steels surface

2019 ◽  
Vol 298 ◽  
pp. 00058 ◽  
Author(s):  
Svetlana Oglezneva ◽  
Evgeny Morozov ◽  
Evgeny Usynin
Keyword(s):  
Heat Treatment ◽  
Cast Steel ◽  
Carbon Steels ◽  
Carbon Powder ◽  
Laser Exposure ◽  
Boundary Values ◽  
Limiting Values ◽  
Powder Steels ◽  
Powder Carbon Steels

The microstructure and microhardness of the surface layer of powder steels PA-ZhGr with different porosity are studied in comparison with cast steel U10 after laser treatment (LT) with a 1 kW fiber laser in argon. Using thermal modeling, the geometric dimensions of the laser exposure zones formed in the area of the laser exposure were calculated and experimentally confirmed, and the mechanisms of their formation were proposed. The boundary values of the integral criterion for the parameters of laser influence for the heat treatment of carbon powder steels are established.

Lattice Imaging of Twin, Lath and α/Martensite Boundaries in Duplex Low Carbon Steels

1977 ◽  
Vol 35 ◽  
pp. 118-119
Author(s):  
J. Y. Koo ◽  
G. Thomas
Keyword(s):  
High Resolution Electron Microscopy ◽  
Ferrite Matrix ◽  
Carbon Steels ◽  
Bright Field Image ◽  
Low Carbon ◽  
Lattice Imaging ◽  
Bright Field ◽  
Lattice Image ◽  
New Information ◽  
Resolution Electron

High resolution electron microscopy has been shown to give new information on defects(1) and phase transformations in solids (2,3). In a continuing program of lattice fringe imaging of alloys, we have applied this technique to the martensitic transformation in steels in order to characterize the atomic environments near twin, lath and αmartensite boundaries. This paper describes current progress in this program.Figures A and B show lattice image and conventional bright field image of the same area of a duplex Fe/2Si/0.1C steel described elsewhere(4). The microstructure consists of internally twinned martensite (M) embedded in a ferrite matrix (F). Use of the 2-beam tilted illumination technique incorporating a twin reflection produced {110} fringes across the microtwins.

Observations on the structure at the transformation interface of pearlite in steel

1990 ◽  
Vol 48 (4) ◽  
pp. 200-201
Author(s):  
F. A. Khalid ◽  
D. V. Edmonds
Keyword(s):  
Room Temperature ◽  
Thin Foil ◽  
Carbon Steels ◽  
Model Alloy ◽  
Growth Interface ◽  
Medium Carbon ◽  
Solution Treated ◽  
Medium Carbon Steels ◽  
Alloy Carbide ◽  
Hot Rolled

The austenite/pearlite growth interface in a model alloy steel (Fe-1 lMn-0.8C nominal wt%) is being investigated. In this particular 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 austenite/pearlite interface, as part of a programme of aimed at studying alloy carbide precipitation reactions at this interface which can result in significant strengthening of microalloyed low- and medium- carbon steels L Similar studies of interface structure, made on a partially decomposed high- Mn austenitic alloy, have been reported recently.The experimental alloys were made as 50 g argon arc melts using high purity materials and homogenised. Samples were hot- rolled, swaged and machined to 3mm diameter rod, solution treated at 1300 °C for 1 hr and WQ. Specimens were then solutionised between 1250 °C and 1000 °C and isothermally transformed between 610 °C and 550 °C for 10-18 hr and WQ.

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.

THERMAL STABILIZATION OF AUSTENITE IN HIGH NICKEL-CARBON STEELS

1982 ◽  
Vol 43 (C4) ◽  
pp. C4-479-C4-484 ◽  
Author(s):  
J. Pietikäinen
Keyword(s):  
Thermal Stabilization ◽  
Carbon Steels ◽  
High Nickel

TEM, EDX and EELS investigation of aluminium nitride precipitation in low-carbon steels

2000 ◽  
Vol 88 (5-6) ◽  
pp. 51-56
Author(s):  
M. Sennour ◽  
C. Esnouf
Keyword(s):  
Carbon Steels ◽  
Aluminium Nitride ◽  
Low Carbon ◽  
Low Carbon Steels ◽  
Nitride Precipitation

Characterization of Microstructure, Hardness and Oxidation Behavior of Carbon Steels Hot Dipped in Al and Al–1 at% Si Molten Baths

2012 ◽  
Vol 50 (8) ◽  
pp. 575-582 ◽  
Author(s):  
Dong Bok Lee ◽  
Trinh Wan Trung ◽  
Sun Kyu Kim ◽  
Min Jung Kim ◽  
Seul Ki Kim ◽  
...  
Keyword(s):  
Oxidation Behavior ◽  
Carbon Steels
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