Fatigue crack propagation in high strength low alloy steels

Spies, H.‐J.; Pusch, G.; Henkel, C.; Röβler, K.

doi:10.1016/0167-8442(89)90040-2

Cited by 12 publications

(2 citation statements)

References 4 publications

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“…A welded joint consists of three zones from the material's micro‐structural viewpoint: weld metal zone (WZ), heat affected zone (HAZ) and base metal zone, and each of them exhibits different mechanical and fatigue behavior 1–3 . The early researches showed there was no significant difference in the fatigue properties for the three zones, 4, 5 and some later researches 6, 7 indicated that the three zones had differences in crack propagation resistance in the low Δ K region or the threshold region. Recently, it was pointed that crack growth rates reflect both the effects of microstructure and residual stresses, and residual stresses in weld play an important role on fatigue crack growth 8, 9 .…”

Section: Introductionmentioning

confidence: 99%

The effect of microstructures on fatigue crack growth in Q345 steel welded joint

Xiong

2012

Fatigue Fract Eng Mat Struct

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A B S T R A C TIt is a traditional that the fatigue crack growth behavior is sensitive to microstructure in threshold regime, while it is sensitive to R-ratio in Paris regime. Fatigue test is carried out for welded joints of a Q345 steel where the compact tension specimens with 3.8 and 12.5 mm thickness are used, and comparisons of fatigue crack growth behavior between base metal and a few different locations in the welded joint are considered in Paris regime. Welding residual stresses are removed by heat treatment to focus the study on the microstructural effect. It is shown that fatigue crack growth rate (FCGR) in the base metal is not sensitive to R-ratio, but the FCGR increases in the overheated zone, the fusion zone and the weld metal zone with R-ratio increasing. To the low R-ratio, FCGR in the three zones is smaller than that in the base metal, but they approximate the same with base metal under the high R-ratio. The mechanism of fatigue crack growth is analyzed through crack path in microstructures and SEM fractograph. The coarse-grained ferrite in the base metal is of benefit to relaxation of the average stress at the crack tip, and the fatigue crack growth predicts branching and deflection within above different locations in the welded joint. These tortuous crack paths with crack branching and deflection will promote crack closure as well as crack-tip stress shielding and then resulted in higher crack growth resistance.a 0 = distance between the notch root and the line of action of the externally applied load a f = crack length measured from the notch root at the termination of test f = loading frequency K max , P max = maximum stress intensity factor, maximum load K min , P min = minimum stress intensity factor, minimum load K op , P op = opening stress intensity factor, opening load K s = stress intensity factor corresponding to the stress shielding effect K eff = effective stress intensity factor range K = applied stress intensity range K tip = stress intensity factor range experienced by the crack tip K eff,tip = crack-tip effective stress intensity factor range Correspondence: Y. Xiong.

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Section: Introductionmentioning

confidence: 99%

The effect of microstructures on fatigue crack growth in Q345 steel welded joint

Xiong

2012

Fatigue Fract Eng Mat Struct

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“…This also has led to the introduction of new high temperature materials while study on temperature effects on fracture is increasingly important. At high temperature, mechanical components are frequently fractured by fatigue and creep [1,2]. In this work, fatigue crack growth has been characterized by Paris law and it was found out that the Paris exponent remained at approximately the same value up to a certain temperature.…”

Section: Introductionmentioning

confidence: 89%

Effect of temperature on fatigue crack growth in P92 steel

2003

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Fracture at high temperature has become a critical problem for such high temperature components as those used in power plants or oil refinery plants, because both high operating temperature and pressure are required for better thermal efficiency. Therefore, it is very important to approach such problems from the viewpoint of high temperature material properties. Since fatigue and creep are closely related to such components failures, the fracture behavior in high temperature components must be evaluated through fatigue and creep crack growth tests, and based on these results, better operating conditions can be determined. In this study, recently developed P92 (9Cr-2W) alloy steel, which is a high strength material for high temperature use, is investigated and its fatigue crack growth has been characterized by Paris law. A series of high temperature fatigue tests were carried out at 400, 500, 550, 600, 625, 650, and 700 o C to verify the temperature effect. The results indicated that the Paris exponent remained at approximately the same value up to a certain temperature. From 600 to 700 o C, creep rupture tests were conducted in order to investigate the creep behavior with temperature. Further analysis has also been carried out to investigate the effect of temperature on fracture mode shift, dimple formation, and its role in crack growth rate and deformability at high temperature.

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Mechanical properties and fatigue crack growth rate of laser-welded 4130 steel

Tsay

Chen

et al. 1992

International Journal of Fatigue

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Fatigue crack propagation in high strength low alloy steels

Cited by 12 publications

References 4 publications

The effect of microstructures on fatigue crack growth in Q345 steel welded joint

The effect of microstructures on fatigue crack growth in Q345 steel welded joint

Effect of temperature on fatigue crack growth in P92 steel

Mechanical properties and fatigue crack growth rate of laser-welded 4130 steel

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