Corrosion behaviour of S25C/S25C friction‐welded butt joints in artificial seawater

Ohue, Y.; Nakayama, Hideaki; Mukai, Yoshihiko; Ogawa, Kōichi

doi:10.1080/09507119309548474

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…In the figure, the numbers in small letters near the data points for the joint specimens show the greatest depth of pits. In the case of the base material specimens, however, they showed corrosion all over as reported in the previous paper, 6 and pits did not have clearly defined shapes. Hence, the number and the depth of corrosion pits were not measured.…”

Section: Test Results and Examinationsupporting

confidence: 45%

“…corrosion pits generated on the structure produced by radial flow. 6 This study was carried out to clarify the effect of corrosion pits on the fatigue strength of joints, by generating corrosion pits near the welded part of the friction welded butt joint. For this purpose, the welded parts of similar material friction welded butt joints obtained from four kinds of carbon steel were immersed in artificial seawater in a stress free condition to induce them to corrode so that specimens with corrosion pits near the weld could be produced.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue fracture characteristics of friction welded butt joints with corrosion pits

Ohue

Nakayama

Mukai

et al. 1996

Welding International

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Studies on the fatigue behaviour of friction welded butt joints between similar carbon steels in ordinary atmospheric environments have revealed that the fatigue strength of the joint is higher than that of the base metal, but the joint shows the larger scatter in fatigue life. On the other hand, the results of corrosion fatigue tests on the joint carried out in artificial seawater indicated that: (1) the corrosion fatigue strength of the joint was almost the same as that of the base metal in the long life region; (2) the scatter in corrosion fatigue life in the joint became smaller with an increase in fatigue life than that of the base metal specimen; and (3) the above mentioned characteristics were governed by corrosion pits preferentially generated near the weld interface.The main aim of this study is to clarify the cause of the fatigue strength reduction by corrosion pits. For this purpose the joint and base metal specimens were immersed in artificial seawater in a stress free condition to generate corrosion pits, and rotating bending fatigue tests were carried out on the specimens with corrosion pits near the weld interface in an ordinary atmospheric environment. Reference data were also obtained by using specimens without corrosion pits. Results of the study clearly indicated that the corrosion pits near the weld interface decreased the fatigue strength of the joint. Fatigue strength reduction due to the corrosion pits was well correlated with the hardness at the fracture site. Furthermore, the fatigue strength reduction factor had a considerably higher value for the specimen immersed in artificial seawater for a long time, which suggests that the other detrimental factors such as grain boundary corrosion have the effect of decreasing the fatigue strength of the joint with corrosion pits. Additionally, the effect of corrosion pits on the fatigue strength reduction was examined with the added effect of a double circumferential notch.

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Section: Test Results and Examinationsupporting

confidence: 45%

Section: Introductionmentioning

confidence: 99%

Fatigue fracture characteristics of friction welded butt joints with corrosion pits

Ohue

Nakayama

Mukai

et al. 1996

Welding International

Self Cite

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“…That is to say, the corrosion pits formed have a morphology due to the fact that the ferrite in the surface area intersecting the fibre flow in the radial direction (laminated structure of ferrite and bainite) is preferentially corroded, 4 and that fatigue cracks are initiated by nucleation around these pits. 5 Joint D fabricated by the flywheel method and not producing any fibre flow at the specimen notch root is therefore predicted to be insensitive to corrosive environments.…”

Section: No-load Immersion Corrosion Propertiesmentioning

confidence: 99%

Dependence of corrosion fatigue behaviour of friction‐welded butt joints on friction welding procedure

Oue¹,

Nakayama²,

Mukai³

et al. 1996

Welding International

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Although friction-welded butt joints are seeing more widespread applications as machine components and structural members, a valid method for evaluation of the joint performance, especially under operating load conditions, has not yet been established. The reliability of this type of joint is supported only by available empirical knowledge. To clarify the fatigue behaviour of joints, the authors have run a series of fatigue tests of several types of friction-welded butt joints in air and have shown that the fatigue strengths of the joints are higher than that of the base metal but that the fatigue lives show heavy scatter. Evaluation of the corrosion fatigue behaviour of frictionwelded butt joints is also a matter of urgency, because some joints have practical applications in corrosive environments.The main purpose of this study is to determine the relationship between the fibre flow conditions near the weld interface of joints and their corrosion fatigue resistance. A series of experiments was run with four frictionwelded butt joint specimens composed of JIS S25C similar carbon structural steel fabricated under different welding conditions. This study covers the following four phases:(1) dependence of the fibre flow conditions on the friction welding procedure; (2) the corrosion response of the four types of joint fabricated by different friction welding procedures; (3) fatigue strength behaviour of the joints with corrosion pits in air; (4) corrosion fatigue resistance of the joints under no-load immersion conditions in artificial sea water.The results of the study show that the corrosion fatigue resistance of the joints is well correlated with the fibre flow conditions. Many deep corrosion pits are formed in the surface area intersecting the fibre flow, and the notch effect of the corrosion pits causes loss of fatigue strength. In other words, joint specimens without this surface area intersecting the fibre flow exhibit superior corrosion fatigue performance.

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Corrosion behaviour of S25C/S25C friction‐welded butt joints in artificial seawater

Cited by 2 publications

References 5 publications

Fatigue fracture characteristics of friction welded butt joints with corrosion pits

Fatigue fracture characteristics of friction welded butt joints with corrosion pits

Dependence of corrosion fatigue behaviour of friction‐welded butt joints on friction welding procedure

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