The corrosion-fatigue fracture of high-strength steels in chloride solutions

1981 ◽  
Vol 16 (6) ◽  
pp. 517-523
Author(s):  
I. I. Vasilenko ◽  
V. I. Kapinos ◽  
A. M. Krutsan ◽  
B. I. Kultan
Keyword(s):  
Fatigue Fracture ◽  
Corrosion Fatigue ◽  
High Strength Steels ◽  
High Strength ◽  
Chloride Solutions

Residual Stress at Fatigue Fracture Surface of Heat Treated High Strength Steels

1979 ◽  
pp. 227-232 ◽  
Author(s):  
Atsutomo Komine ◽  
Hideo Ueda ◽  
Eisuke Nakanishi ◽  
Shotaro Araki ◽  
Kazuo Taguchi
Keyword(s):  
Residual Stress ◽  
Fracture Surface ◽  
Fatigue Fracture ◽  
High Strength Steels ◽  
High Strength ◽  
Fatigue Fracture Surface ◽  
Heat Treated

X-Ray Measurement of Residual Stress Near Fatigue Fracture Surfaces of High Strength Steel

1985 ◽  
Vol 29 ◽  
pp. 265-270 ◽  
Author(s):  
Yukio Hirose ◽  
Keisuke Tanaka
Keyword(s):  
Residual Stress ◽  
Fatigue Fracture ◽  
High Strength Steels ◽  
Diffraction Method ◽  
High Strength ◽  
Fatigue Tests ◽  
Fracture Mechanisms ◽  
Aqueous Environment ◽  
X Ray ◽  
Fracture Surfaces

The residual stress left on the fracture surface is one of the important parameters in X-ray fractography and has been used to analyse fracture mechanisms in fracture toughness, stress corrosion cracking and fatigue tests especially of high strength steels.In this study, the distribution of residual stress near fatigue fracture surfaces made in air and in 3.5% NaCl solution was measured by the X-ray diffraction method. The effect of aqueous environment on the plastic deformation near fatigue fracture surfaces was discussed on the basis of the residual stress distribution.

Corrosion-Fatigue Performance of High-Strength Riser Steels in Seawater and Sour Brine Environments

2011 ◽  
Author(s):  
Stephen J. Hudak ◽  
Guadalupe B. Robledo ◽  
Jeffrey Hawk
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Corrosion Fatigue ◽  
Cathodic Protection ◽  
High Strength Steels ◽  
High Strength ◽  
Fatigue Performance ◽  
Material Strength ◽  
Loading Frequency

Although new high-strength steels have recently been developed to meet the demands of increased reservoir pressures, and sour production fluids, the corrosion-fatigue performance of these new higher-strength materials is largely unknown. The goal of this study was to fill this knowledge gap by generating corrosion-fatigue data in two aggressive environments: 1) a sour production brine, and 2) seawater with cathodic protection. The focus of the current paper is on stress-life (S-N) corrosion-fatigue results in these environments, as well as a baseline air environment. Experiments were performed on five different steels with yield strengths ranging from 848 MPa to 1080 MPa. Prior frequency-scan results based on corrosion-fatigue crack growth rate data demonstrated that not all of these material-environment combinations exhibit a saturation frequency where the detrimental environmental effect approached a constant value as the cyclic loading frequency is decreased. Consequently, S-N tests were performed at different frequencies (0.01 Hz, 0.17 Hz, and 1 Hz), depending on the fatigue life regime, in attempting to match the loading frequencies experienced in service. Corrosion-fatigue occurred at stresses well below the fatigue endurance limit in laboratory air, and cyclic lives in the seawater with cathodic protection environment were found to be 2X to 10X less than those in the baseline air environment, while cyclic lives in the sour brine environment were found to be 30X to 100X less than those in the baseline air environment. In both environments, degradation was greatest at lower stresses in the high cycle fatigue regime. The effect of material strength level had little or no measurable effect on the S-N corrosion-fatigue performance, and the effect of cyclic frequency on the corrosion-fatigue performance was mixed. The S-N response to these two variables differed significantly from recently measured fatigue crack growth kinetics in these same materials that were performed in a companion study. Possible reasons for these differences are discussed.

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.

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