Effect of high-temperature thermomechanical treatment (HTMT) on the fatigue strength of high-carbon steels

1967 ◽  
Vol 2 (4) ◽  
pp. 340-343 ◽  
Author(s):  
O. N. Romaniv ◽  
N. L. Kuklyak ◽  
I. P. Vyval
Keyword(s):  
High Temperature ◽  
Fatigue Strength ◽  
Thermomechanical Treatment ◽  
Carbon Steels ◽  
High Carbon

Sintered High Carbon Steels: Effect of Thermomechanical Treatments on their Mechanical and Wear Performance

2008 ◽  
Vol 591-593 ◽  
pp. 271-276 ◽  
Author(s):  
M.A. Martinez ◽  
R. Calabrés ◽  
J. Abenojar ◽  
Francisco Velasco
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Powder Metallurgy ◽  
Thermomechanical Treatment ◽  
Bending Strength ◽  
Carbon Steels ◽  
Tool Steels ◽  
High Carbon ◽  
Wear Performance ◽  
Metallographic Study

In this work, ultrahigh carbon steels (UHCS) obtained by powder metallurgy with CIP and argon sintered at 1150°C. Then, they were rolled at 850 °C with a reduction of 40 %. Finally, steels were quenched at 850 and 1000 °C in oil. In each step, hardness, bending strength and wear performance were evaluated. Obtained results are justified with a metallographic study by SEM. Both mechanical properties and wear resistance are highly favoured with the thermomechanical treatment that removes the porosity of the material. Moreover, final quenching highly hardens the material. The obtained material could be used as matrix for tool steels.

Fatigue strength of spring steel subjected to high-temperature thermomechanical treatment and ?inheritance? treatment

1976 ◽  
Vol 11 (3) ◽  
pp. 373-374
Author(s):  
M. L. Bernshtein ◽  
S. A. Guseinov ◽  
V. A. Zaimovskii ◽  
V. M. Semenov
Keyword(s):  
High Temperature ◽  
Fatigue Strength ◽  
Thermomechanical Treatment ◽  
Spring Steel

Effect of Fast Prototyping Means on the Fatigue Strength of High Carbon Steels

2013 ◽  
Vol 302 ◽  
pp. 241-247
Author(s):  
Rinaldo Puff ◽  
Renato Barbieri
Keyword(s):  
Fatigue Strength ◽  
Shot Peening ◽  
Retained Austenite ◽  
Fatigue Tests ◽  
Carbon Steels ◽  
Work Piece ◽  
High Carbon ◽  
Fast Prototyping ◽  
Cutting Processes ◽  
Finishing Processes

The objective of this article is to present the effect of fast prototyping means on the fatigue strength of SAE 1075 steel used for planar springs, which are commonly used in different type of machines. Two cutting processes are used for rapid prototyping those components. The first one, with CO2 laser cutting machines and the second, using Electrical Discharge Machines – EDM. It was also evaluated the effect of applying three levels of finishing processes on the work pieces: tumbling, polishing and shot peening. Fatigue tests were performed using a machine specially developed for this purpose, applying fluctuating loads. An analytic formulation and also the use of Finite Element Method – FEM – were applied in order to obtain the stresses present in the work piece during the load application. The characteristics of the work pieces´ surface, mainly at the cutting edge were analyzed, and so was the microstructure of them near the cutting region. It was found that, mainly in the pieces cut by laser, there is a Thermally Affected Zone – TAZ – composed by bainite with retained austenite, which affects the fatigue strength of the material. It was also found that finishing processes improve the fatigue strength of the material by removing defects introduced by the cutting means, and the application of shot peening introduces the better final characteristics.

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.

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