Low Cycle Notched Fatigue Behavior and Life Predictions of A723 High Strength Steels.

1995 ◽  
Author(s):  
E. Troiano ◽  
J. H. Underwood ◽  
D. Crayon ◽  
R. T. Abbott
Keyword(s):  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Life Predictions

Fatigue-Corrosion of High Strength Steels in Synthetic Seawater under Cathodic Protection

2020 ◽  
Vol 841 ◽  
pp. 294-299
Author(s):  
Sergio Lorenzi ◽  
Cristian Testa ◽  
Marina Cabrini ◽  
Francesco Carugo ◽  
Luigi Coppola ◽  
...  
Keyword(s):  
Cathodic Protection ◽  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Loading Frequency ◽  
Offshore Pipelines ◽  
Synthetic Seawater ◽  
Steel Grades ◽  
Protection Potential ◽  
Fatigue Corrosion

The paper is aimed to the study of the corrosion-fatigue behavior of high strength steels for offshore pipelines. Tests have been performed in order to study fatigue crack growth in synthetic seawater under cathodic protection. The tests have been carried out on three different steel grades from 65 to 85 ksi with tempered martensite and ferrite-bainite microstructures. The effect of stress intensity factor, cathodic protection potential and cyclic loading frequency is shown.

Study of Fatigue Behavior for Spot Welded Tensile Shear Specimens of Advanced High Strength Steels

2012 ◽  
Vol 83 (10) ◽  
pp. 988-994 ◽  
Author(s):  
Gert Weber ◽  
Stephan Brauser ◽  
Holger Gaul ◽  
Michael Rethmeier
Keyword(s):  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Tensile Shear ◽  
Advanced High Strength Steels ◽  
Spot Welded

313 Effect of Stress Ratio on Long-Life Fatigue Behavior in High Strength Steels

2005 ◽  
Vol 2005 (0) ◽  
pp. 197-198
Author(s):  
Kazuaki SHIOZAWA ◽  
Seiichi NISHINO ◽  
Takayuki HASEGAWA ◽  
Yasuyuki YACHI
Keyword(s):  
Stress Ratio ◽  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Long Life

Fatigue Assessment of Tubular Automotive Components in Presence of Inhomogeneities

2004 ◽  
Author(s):  
Stefano Beretta ◽  
Herna´n Juan Desimone ◽  
Andrea Poli
Keyword(s):  
Fatigue Limit ◽  
Detrimental Effect ◽  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Probability Of Failure ◽  
Integral Approach ◽  
Material Strength ◽  
Automotive Components ◽  
Tubular Components

Tubular automotive components, e.g. stabilizers and half shafts, are components subjected to fatigue. In order to assess fatigue behavior of such components, it is important to know both the real load conditions as well as the material strength against multi-axial fatigue. For the second point, a detrimental effect in the fatigue limit of high strength steels is given by the defects present in the component, coming from the material (such as microinclusions, microvoids, etc) or for the process (e.g. handling marks). An integral approach in order to assess fatigue limit of tubular components is proposed. The attention is focused onto planar inhomogeneities, which are the most common in tubular products, though the methodology can be extended to different defect-shapes. The method is applied together with a probabilistic model, in order to analyze the probability of failure. In particular, two different processes (in terms of inhomogeneities present in the final component) are compared, and the results allow to evaluate, for example, the admissible load for the desired (or design) level of failure probability for the component.

A Study on Fatigue Fracture Mechanism of Cr-Mo Steel SCM435 in Super Long Life Range

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1697-1703 ◽  
Author(s):  
Ri Ichi Murakami ◽  
Daisuke Yonekura ◽  
Taishi Murayama
Keyword(s):  
Fatigue Fracture ◽  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Fatigue Tests ◽  
Microscopy Observation ◽  
Horizontal Part ◽  
Long Life ◽  
Fatigue Fracture Behavior ◽  
Fish Eye

For high strength steels, a characteristic fatigue behavior, which S-N curve comes down again in the long life region of N > 107 cycles, was reported by many researchers. Specifically, for high strength steel, the fatigue limit is temporal value because of the fish-eye fracture in the long life region over about N = 107 cycles. However, fish eye fracture does not appear for medium strength steel in super long life range. In this paper, cantilever-type rotational bending fatigue tests were carried out for quenched and tempered Cr-Mo steel (JIS: SCM435) up to 109 cycles at room temperature in air. The S-N curve showed a horizontal part in long life region over 107 cycles. In addition, fish- eye fracture was not observed and for all specimens, the crack initiation occurred from the specimen surface. The fatigue fracture behavior of SCM435 in super long life was discussed based on optical microscopy observation and scanning electron microscopy observation.

Internal Fatigue Failure Mechanism of High Strength Steels in Gigacycle Regime

2008 ◽  
Vol 378-379 ◽  
pp. 65-80 ◽  
Author(s):  
Kazuaki Shiozawa ◽  
Lian Tao Lu
Keyword(s):  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Internal Crack ◽  
Bending Fatigue ◽  
The Matrix ◽  
Carbide Distribution ◽  
Fish Eye ◽  
Granular Morphology ◽  
Very High

Gigacycle fatigue behavior in high-strength steels tested under rotary bending fatigue was summarized in this paper. Characteristic of the very high cycle fatigue is to be caused the transition of fracture mode from surface-induced fracture to subsurface inclusion-induced one. In the vicinity of an inclusion at the origin of internal crack, granular-bright-facet (GBF) area was formed during extremely long fatigue cycles. It was pointed out that the formation of GBF area was an important factor for the control of the internal fatigue fracture in gigacycle regime. The GBF area revealed a very rough granular morphology compared with the area outside the GBF inside the fish-eye zone, and was related to the carbide distribution in the microstructure of the matrix. From the detailed observation of fracture surface and computer simulation by FRASTA method, the GBF area formation mechanism in a gigacycle fatigue regime was proposed as the ‘dispersive decohesion of spherical carbide model’.

scholarly journals Effect of Quenching and Partitioning Heat Treatment on the Fatigue Behavior of 42SiCr Steel

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1699
Author(s):  
Marco Thomä ◽  
Guntram Wagner
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Material Properties ◽  
Retained Austenite ◽  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Advanced High Strength Steels ◽  
Scanning Electron

The manufacturing of advanced high-strength steels with enhanced ductility is a persistent aim of research. The ability of a material to absorb high loads while showing a high deformation behavior is a major task for many industrial fields like the mobility sector. Therefore, the material properties of advanced high-strength steels are one of the most important impact factors on the resulting cyclic fatigue behavior. To adjust advanced material properties, resulting in high tensile strengths as well as an enhanced ductility, the heat treatment process of quenching and partitioning (QP) was developed. The quenching takes place in a field between martensite start and martensite finish temperature and the subsequent partitioning is executed at slightly elevated temperatures. Regarding the sparsely investigated field of fatigue research on quenched and partitioned steels, the present work investigates the influence of a QP heat treatment on the resulting microstructure by light and scanning electron microscopy as well as on the mechanical properties such as tensile strength and resistance against fatigue regarding two different heat treatment conditions (QP1, QP2) in comparison to the cold-rolled base material of 42SiCr steel. Therefore, the microscopic analysis proved the presence of a characteristic quenched and partitioned microstructure consisting of a martensitic matrix and partial areas of retained austenite, whereas carbides were also present. Differences in the amount of retained austenite could be observed by using X-ray diffraction (XRD) for the different QP routes, which influence the mechanical properties resulting in higher tensile strength of about 2000 MPa for QP1 compared to about 1600 MPa for QP2. Furthermore, the transition for the fatigue limit was approximated by using stepwise load increase tests (LIT) and afterwards verified by constant amplitude tests (CAT) in accordance with the staircase method, whereas the QP 1 condition reached the highest fatigue strength of 900 MPa. Subsequent light and scanning electron microscopy of selected fractured surfaces and runouts showed a different behavior regarding the size of the fatigue fracture area and also differences in the microstructure of these runouts.

Very High Cycle Fatigue Behavior of High Strength Steels

2008 ◽  
pp. 1131-1132
Author(s):  
Yoshiaki Akiniwa ◽  
Nobuyuki Miyamoto ◽  
Hirotaka Tsuru ◽  
Keisuke Tanaka
Keyword(s):  
High Cycle Fatigue ◽  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High
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