Fatigue and crack growth behavior of Inconel 718–AL6XN dissimilar welds

R. Cortés; N. K. Rodríguez; R. R. Ambriz; V. H. López; A. Ruiz; D. Jaramillo

doi:10.1016/j.msea.2018.12.087

Fatigue and crack growth behavior of Inconel 718–AL6XN dissimilar welds

R. Cortés, N. K. Rodríguez, R. R. Ambriz, V. H. López, A. Ruiz, D. Jaramillo

Centro de Investigación e Innovación Tecnológica (CIITEC)

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

The fatigue and crack growth behavior of Inconel 718 and AL6XN alloys joined with an ERNiFeCr-2 filler by the gas tungsten arc welding process was evaluated. A comparison between Wöhler curves for the monolithic IN718 and AL6XN alloys and the IN718-AL6XN dissimilar welded joint were obtained. Although Vickers microhardness profiles revealed the presence of a soft region in the heat affected zone of the IN718 base material, the fatigue crack nucleated at the fusion zone near to the AL6XN and propagated across the weld bead. The welded joint and the AL6XN base material presented a similar high cycle fatigue behavior despite the presence of an unmixed zone at the AL6XN/weld metal interface. The results of the fatigue crack growth test indicated that the weld metal has the highest growing rate owing to the presence of brittle secondary phases such as Laves and NbC. The fatigue crack growth rates obtained from experimental data were compared with measurements of the distance between striations on the fracture surfaces, both were very close.

Original language	English
Pages (from-to)	20-30
Number of pages	11
Journal	Materials Science and Engineering A
Volume	745
DOIs	https://doi.org/10.1016/j.msea.2018.12.087
State	Published - 4 Feb 2019

Keywords

Fatigue crack growth
GTAW
Inconel-AL6XN
Wöhler curves

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title = "Fatigue and crack growth behavior of Inconel 718–AL6XN dissimilar welds",

abstract = "The fatigue and crack growth behavior of Inconel 718 and AL6XN alloys joined with an ERNiFeCr-2 filler by the gas tungsten arc welding process was evaluated. A comparison between W{\"o}hler curves for the monolithic IN718 and AL6XN alloys and the IN718-AL6XN dissimilar welded joint were obtained. Although Vickers microhardness profiles revealed the presence of a soft region in the heat affected zone of the IN718 base material, the fatigue crack nucleated at the fusion zone near to the AL6XN and propagated across the weld bead. The welded joint and the AL6XN base material presented a similar high cycle fatigue behavior despite the presence of an unmixed zone at the AL6XN/weld metal interface. The results of the fatigue crack growth test indicated that the weld metal has the highest growing rate owing to the presence of brittle secondary phases such as Laves and NbC. The fatigue crack growth rates obtained from experimental data were compared with measurements of the distance between striations on the fracture surfaces, both were very close.",

keywords = "Fatigue crack growth, GTAW, Inconel-AL6XN, W{\"o}hler curves",

author = "R. Cort{\'e}s and Rodr{\'i}guez, {N. K.} and Ambriz, {R. R.} and L{\'o}pez, {V. H.} and A. Ruiz and D. Jaramillo",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2019",

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doi = "10.1016/j.msea.2018.12.087",

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T1 - Fatigue and crack growth behavior of Inconel 718–AL6XN dissimilar welds

AU - Cortés, R.

AU - Rodríguez, N. K.

AU - Ambriz, R. R.

AU - López, V. H.

AU - Ruiz, A.

AU - Jaramillo, D.

PY - 2019/2/4

Y1 - 2019/2/4

N2 - The fatigue and crack growth behavior of Inconel 718 and AL6XN alloys joined with an ERNiFeCr-2 filler by the gas tungsten arc welding process was evaluated. A comparison between Wöhler curves for the monolithic IN718 and AL6XN alloys and the IN718-AL6XN dissimilar welded joint were obtained. Although Vickers microhardness profiles revealed the presence of a soft region in the heat affected zone of the IN718 base material, the fatigue crack nucleated at the fusion zone near to the AL6XN and propagated across the weld bead. The welded joint and the AL6XN base material presented a similar high cycle fatigue behavior despite the presence of an unmixed zone at the AL6XN/weld metal interface. The results of the fatigue crack growth test indicated that the weld metal has the highest growing rate owing to the presence of brittle secondary phases such as Laves and NbC. The fatigue crack growth rates obtained from experimental data were compared with measurements of the distance between striations on the fracture surfaces, both were very close.

AB - The fatigue and crack growth behavior of Inconel 718 and AL6XN alloys joined with an ERNiFeCr-2 filler by the gas tungsten arc welding process was evaluated. A comparison between Wöhler curves for the monolithic IN718 and AL6XN alloys and the IN718-AL6XN dissimilar welded joint were obtained. Although Vickers microhardness profiles revealed the presence of a soft region in the heat affected zone of the IN718 base material, the fatigue crack nucleated at the fusion zone near to the AL6XN and propagated across the weld bead. The welded joint and the AL6XN base material presented a similar high cycle fatigue behavior despite the presence of an unmixed zone at the AL6XN/weld metal interface. The results of the fatigue crack growth test indicated that the weld metal has the highest growing rate owing to the presence of brittle secondary phases such as Laves and NbC. The fatigue crack growth rates obtained from experimental data were compared with measurements of the distance between striations on the fracture surfaces, both were very close.

KW - Fatigue crack growth

KW - GTAW

KW - Inconel-AL6XN

KW - Wöhler curves

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DO - 10.1016/j.msea.2018.12.087

M3 - Artículo

SN - 0921-5093

VL - 745

SP - 20

EP - 30

JO - Materials Science and Engineering A

JF - Materials Science and Engineering A

ER -

Fatigue and crack growth behavior of Inconel 718–AL6XN dissimilar welds

Abstract

Keywords

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