Influence of the local degree of deformation on the temperature dependent fatigue behaviour of a ferritic–pearlitic steel

2020 ◽  
Vol 43 (12) ◽  
pp. 2786-2799
Author(s):  
Thomas Kirste ◽  
Roman Morgenstern ◽  
Alexander Schmiedel ◽  
Anja Weidner ◽  
Horst Biermann
Keyword(s):  
Pearlitic Steel ◽  
Fatigue Behaviour ◽  
Temperature Dependent ◽  
Degree Of Deformation ◽  
Local Degree

Effect of Varying Cold-Drawing Deformation on Residual Stresses Measured by Neutron Diffraction in Steel Rods

2008 ◽  
Vol 571-572 ◽  
pp. 51-56 ◽  
Author(s):  
Jesus Ruiz-Hervias ◽  
Vladimir Luzin ◽  
Henry Prask ◽  
T. Gnaeupel-Herold ◽  
Manuel Elices Calafat
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
True Strain ◽  
Cold Drawing ◽  
Pearlitic Steel ◽  
Stress Profile ◽  
Degree Of Deformation ◽  
Residual Stress Profile ◽  
Stress Profiles ◽  
Tyre Industry

Cold-drawing is employed to fabricate wires and rods, which are mainly used as structural reinforcements in construction as well as in the tyre industry. As a consequence of processing, a residual stress profile is developed. In this paper, residual stress profiles are measured by neutron diffraction in cold-drawn pearlitic steel rods subjected to different deformations (true strain from 0.3 to 1.7). The results show that the residual stress profile produced by cold-drawing is similar in all the samples, irrespective of the degree of deformation.

scholarly journals Thermal softening of fine pearlitic steel and its effect on the fatigue behaviour

2010 ◽  
Vol 2 (1) ◽  
pp. 541-545 ◽  
Author(s):  
K. Cvetkovski ◽  
J. Ahlström ◽  
B. Karlsson
Keyword(s):  
Pearlitic Steel ◽  
Fatigue Behaviour ◽  
Thermal Softening

Overview of Fatigue Behaviour of Ultrafine-Grained Copper Produced by Severe Plastic Deformation

2007 ◽  
Vol 567-568 ◽  
pp. 9-16 ◽  
Author(s):  
Petr Lukáš ◽  
Ludvík Kunz ◽  
Milan Svoboda
Keyword(s):  
Grain Size ◽  
Strain Curve ◽  
Shear Plane ◽  
Fatigue Behaviour ◽  
Cyclic Stress ◽  
Grain Structure ◽  
Temperature Dependent ◽  
Stress Strain Curve ◽  
Ultrafine Grained ◽  
Broad Region

Fatigue behaviour of ultrafine-grained copper of purity 99.9 % produced by ECAP technique was studied in a broad region of stress amplitudes. Fatigue strength is by a factor of about 2 higher than that of conventional-grain-size copper in the broad region of fatigue lives from 6x103 to 2x1010 cycles. The grain structure is stable and undergoes only very marginal changes during cycling. Fatigue slip markings on specimen surface follow the trace of the shear plane of the last ECAP pass. Fatigue notch sensitivity is also higher than that of conventional-grain-size copper, but not dramatically. The cyclic stress-strain curve of studied copper is temperature insensitive, while its S-N curve is temperature dependent.

Fatigue Properties of Steels with Ultrasonic Attrition Treated Surface Layers

2008 ◽  
Vol 604-605 ◽  
pp. 239-248 ◽  
Author(s):  
J. Uusitalo ◽  
L. Pentti Karjalainen ◽  
Delphine Retraint ◽  
M. Palosaari
Keyword(s):  
Stainless Steels ◽  
Crack Nucleation ◽  
Pearlitic Steel ◽  
Fatigue Behaviour ◽  
Carbon Steels ◽  
Fatigue Properties ◽  
Low Carbon ◽  
Surface Layers ◽  
Steel Sheets ◽  
Strain Induced Martensite

Severely deformed surface layers have been created by ultrasonic attrition technique on four steel sheets to investigate their influence on fatigue behaviour. A low-carbon (0.05%) ferritic steel and a medium-carbon (0.47%) normalized ferritic-pearlitic steel were selected to study the effect of carbon content on fatigue properties of carbon steels. Two stainless steels, Type 316L and Type 301LN, were also tested to study the influence of stability of the austenitic structure. Microstructural features were characterized by hardness measurements, X-ray diffraction and optical and electron microscopy. Fatigue properties were determined in flexural bending in the range 104 to 107 cycles. Crack nucleation and propagation stages were followed. In the attrition treatment thin severely deformed surface layers were found to form. Highly increased hardness was measured in these layers, especially for stainless steels, where also strain-induced martensite was formed. Drastic improvement in fatigue resistance was observed for all steels due to the surface nanocrystallization treatment.

Micro- and Macro-Approach to the Fatigue Crack Propagation in High-Strength Pearlitic Steel Wires

2007 ◽  
Vol 348-349 ◽  
pp. 681-684 ◽  
Author(s):  
Jesús Toribio ◽  
B. Gonzáles ◽  
Juan Carlos Matos ◽  
F.J. Ayaso
Keyword(s):  
Fatigue Cracks ◽  
Crack Opening ◽  
High Strength ◽  
Cold Drawing ◽  
Pearlitic Steel ◽  
Fatigue Behaviour ◽  
Eutectoid Steel ◽  
Opening Displacement ◽  
Steel Wires

This paper analyzes how the cold drawing process influences the fatigue behaviour of eutectoid steel, with special emphasis on the role of microstructural changes induced during such a manufacturing process. Fatigue cracks are transcollonial and exhibit a preference for fracturing pearlitic lamellae, with non-uniform crack opening displacement values, micro-discontinuities, branchings, bifurcations and frequent local deflections that create microstructural roughness. The net fatigue surface increases with cold drawing due to the higher angle of crack deflections.

(111) Monocrystalline Nickel Films

1972 ◽  
Vol 30 ◽  
pp. 512-513
Author(s):  
T.E. Pratt ◽  
R.W. Vook
Keyword(s):  
Film Thickness ◽  
Deposition Rate ◽  
Room Temperature ◽  
Narrow Range ◽  
High Vacuum ◽  
Residual Pressure ◽  
Temperature Dependent ◽  
Deposition Parameters ◽  
Transmission Electron ◽  
Substrate Temperatures

(111) oriented thin monocrystalline Ni films have been prepared by vacuum evaporation and examined by transmission electron microscopy and electron diffraction. In high vacuum, at room temperature, a layer of NaCl was first evaporated onto a freshly air-cleaved muscovite substrate clamped to a copper block with attached heater and thermocouple. Then, at various substrate temperatures, with other parameters held within a narrow range, Ni was evaporated from a tungsten filament. It had been shown previously that similar procedures would yield monocrystalline films of CU, Ag, and Au.For the films examined with respect to temperature dependent effects, typical deposition parameters were: Ni film thickness, 500-800 A; Ni deposition rate, 10 A/sec.; residual pressure, 10-6 torr; NaCl film thickness, 250 A; and NaCl deposition rate, 10 A/sec. Some additional evaporations involved higher deposition rates and lower film thicknesses.Monocrystalline films were obtained with substrate temperatures above 500° C. Below 450° C, the films were polycrystalline with a strong (111) preferred orientation.

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