Fatigue crack propagation rates and threshold stress intensity factors for welded joints of HT80 steel at several stress ratios

Ohta, Akihiko; Sasaki, Etsuo; Nihei, Masatoshi; Kosuge, M.; Kanao, Masao; Inagaki, Michio

doi:10.1016/0142-1123(82)90006-8

Cited by 49 publications

(18 citation statements)

References 15 publications

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“…They found that an increase in the heat input, by changing the welding current and speed, coarsened the grain structure, thus reduced the hardness in the weld metal (WM) and the heat-affected zone (HAZ). As reported by Ohta et al (1982), the fatigue properties of WM and HAZ of welded joints formed by different welding methods (e.g., submerged arc welding and gas metal arc welding) were inferior to those of the parent metal (PM) because of tensile residual stresses. However, Tsay et al (1992) reported that a laser multipletempering process or a moderate post-weld heat-treatment (at 525 • C for one hour) could greatly improve the fatigue crack growth properties in WM and HAZ as the subsequent fatigue crack growth rate (da/dN) was similar to that of PM.…”

Section: Introductionmentioning

confidence: 89%

Tensile overload-induced plastic deformation and fatigue behavior in weld-repaired high-strength low-alloy steel

Zhang

Lü

et al. 2013

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 89%

Tensile overload-induced plastic deformation and fatigue behavior in weld-repaired high-strength low-alloy steel

Zhang

Lü

et al. 2013

Journal of Materials Processing Technology

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“…Bei Belastung senkrecht zur Extrusionsrichtung ist die Zugfestigkeit des partikelverstärkten Grundwerkstoffs um mehr als 25 Zugversuchsproben der artgleichen Verbindung AMC + AMC (J1) versagten auf der "advancing side" in dem Bereich der Wärmeeinflusszone, der die niedrigste Härte aufweist. In der Literatur werden für artgleiche Verbindungen aus partikelverstärktem Aluminium Schweißfaktoren R m,FSW /R m,Grundw.…”

Section: Zugversuchunclassified

Artgleiche und artverschiedene reibrührgeschweißte Verbindungen aus AA2124+25 % SiC und AA2024

Fuchs

Zimmermann²,

Sauer

et al. 2008

Materialwissenschaft Werkst

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Ein Aluminiummatrixverbundwerkstoff (AMC), der aus einer mit 25 Vol.-% SiC Partikeln verstärkten AA2124 Matrix bestand, wurde in Extrusionsrichtung zu artgleichen AMC+AMC und artverschiedenen AMC+2024-T3 Verbindungen reibrührgeschweißt. Wenn das partikelverstärkte Aluminium bei artverschiedenen Verbindungen auf der "retreating side" positioniert wurde, war der Materialaustausch weniger intensiv. Aufgrund eines Verhakungseffekts waren Festigkeit und Duktilität trotzdem höher als bei der umgekehrten Anordnung der Fügepartner. Das Verhalten bei monotoner und zyklischer Belastung wurde sowohl für den partikelverstärkten Grundwerkstoff als auch für die Schweißverbindun-gen von einer ausgeprägten Richtungsabhängigkeit bestimmt. Ursache ist die Orientierung von SiC-Partikelzeilen in Extrusionsrichtung. Bei artverschiedenen Verbindungen sind die longitudinalen Zugeigenspannungen auf der partikelverstärkten Seite der Schweißnaht geringer als auf der Seite des unverstärkten Materials, was wahrscheinlich mit der Ausbildung von SiC-Partikelclustern an der Grenzfläche zwischen den beiden Materialien zusammenhängt. Die für artgleiche Verbindungen ermittelten da/dN-DK Kurven wurden mit den gemessenen Eigenspannungen korreliert.Schlüsselworte: Reibrührschweißen, 2024-T3, Partikelverstär-kung, Ermüdung, Rissausbreitung An aluminium matrix composite (AMC) consisting of an AA2124 matrix reinforced by 25 vol.% SiC particles was used to produce similar AMC+AMC and dissimilar AMC+2024-T3 joints by friction stir welding. When the particle reinforced composite was located on the retreating side, material mixing was less intense for dissimilar joints. Nevertheless, a higher strength has been determined for this arrangement due to a hook-like interlocking of both materials. Tensile test and S-N fatigue behaviour is shown to be compromised by alignment of the reinforcement particles perpendicular to loading direction already in the particle reinforced base material. Welding residual stresses were determined through the cut-compliance method in terms of stress intensities acting at the crack tip. The underlying residual stress distribution in the un-cracked structure was calculated by the weight function method. Longitudinal tensile residual stresses were found to be higher in the monolithic material as compared to the particle reinforced composite. This held true both for similar and within dissimilar joints. Growth behaviour of cracks crossing the joint line was described and correlated with residual stresses for similar joints.

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“…It has been found [1] that the fatigue crack propagation properties do not change in spite of the difference in stress ratio when transverse-butt-welded center-cracked-type specimens are used, because crack closure [2] does not occur for this kind of specimen due to the saturated stress ratio effect from tensile residual stresses. That is, for the transverse-butt-welded centercracked-type specimens, the applied range of stress intensity factor AK coincided with the effective range of stress intensity factor AKaf at any stress ratio [1].…”

Section: Introductionmentioning

confidence: 99%

“…That is, for the transverse-butt-welded centercracked-type specimens, the applied range of stress intensity factor AK coincided with the effective range of stress intensity factor AKaf at any stress ratio [1]. Therefore, the fatigue crack propagation properties obtained with transverse-butt-welded center-cracked-type specimens amount to the basic fatigue crack propagation properties.…”

Section: Introductionmentioning

confidence: 99%

Minor role of fractographic features in basic fatigue crack propagation properties

1992

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The fatigue crack propagation rate and the fatigue threshold were investigated for transverse-butt-welded joints of the austenitic stainless steel SUS304. Specimens were of the center-cracked type. In three sets of tests the fatigue crack passed through the weld metal, and in the other two sets, through the base metal. The fatigue crack propagation properties coincided with each other at different stress ratios for the weld metal, and at the higher stress ratios for the base metal. The propagation properties improved at the stress ratio of zero for the base metal. The absence of a stress ratio effect means that the coincided properties are basic ones in which fatigue crack closure does not occur. However, fractographic appearance and surface roughness were quite different between weld metal and base metal. The coincidence of fatigue crack propagation properties in spite of the difference in fractographic features reveals that the fractographic appearance and surface roughness only have a minor effect on basic fatigue crack propagation behaviour.

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Fatigue crack propagation rates and threshold stress intensity factors for welded joints of HT80 steel at several stress ratios

Cited by 49 publications

References 15 publications

Tensile overload-induced plastic deformation and fatigue behavior in weld-repaired high-strength low-alloy steel

Tensile overload-induced plastic deformation and fatigue behavior in weld-repaired high-strength low-alloy steel

Artgleiche und artverschiedene reibrührgeschweißte Verbindungen aus AA2124+25 % SiC und AA2024

Minor role of fractographic features in basic fatigue crack propagation properties

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