Influence of dwell time on fatigue crack propagation in Alloy 718 laser welds

Harihara Subramonia Iyer, Anand, 1990 (author): Chalmers University of Technology, Sweden,Chalmers tekniska högskola

Stiller, Krystyna Marta, 1947 (author): Chalmers University of Technology, Sweden,Chalmers tekniska högskola

Hörnqvist Colliander, Magnus, 1979 (author): Chalmers University of Technology, Sweden,Chalmers tekniska högskola

(creator_code:org_t)

Elsevier BV, 2017
2017
English.
In: Materials Science & Engineering. - : Elsevier BV. - 0921-5093 .- 1873-4936. ; 704, s. 440-447

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; https://research.cha...; show less...

Abstract Subject headings

The introduction of welded assemblies in aerospace components aid in weight reduction, but also lead to an increased risk of defects. It is therefore important to analyze the high temperature crack growth resistance of such welds. The results from high temperature cyclic and dwell-fatigue testing of surface flawed Alloy 718 welds are presented here. An increasing temperature and application of a dwell time accelerate the crack growth and increase interaction with secondary phases. During cyclic loading at 550 °C, there is little interaction with the microstructure during transgranular propagation, but the application of dwell times results in a mixture of transgranular propagation and intergranular cracking of boundaries between different dendrites. At 650 °C, mixed intergranular and transgranular mode of crack growth is seen under both cyclic and dwell conditions. However, during dwell-fatigue the interfaces between the secondary arms of the same dendrite are also weakened, leading to an interfacial type of crack growth also in the intergranular parts.

TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

By the author/editor: Harihara Subramo ...; Stiller, Krystyn ...; Leijon, Gunnar; Andersson-Östlin ...; Hörnqvist Collia ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Metallurgy and M ...

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