Fatigue properties of Scalmalloy® processed by laser powder bed fusion in as-built, chemically and conventionally machined surface condition

Raab, Maximilian; Bambach�, Markus

doi:10.1016/j.jmatprotec.2022.117811

Cited by 12 publications

(12 citation statements)

References 50 publications

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“…The average UTS of the untreated samples is about 350 MPa, while that of the heat-treated samples is about 490 MPa, approximately 6% lower than the nominal value reported for Scalmalloy, namely 510-530 MPa. These values are in agreement with recent observations by Raab and Bambach [16], who reported strengths of approximately 510 MPa for Scalmalloy specimens treated at 325 • C for 2 hours and 350 MPa for untreated samples. Similar strength increments following heat treatment were found by Spierings et al [17], with an UTS of 520 MPa for treated samples (325 • C for 4 hours) and 410 MPa in the as-built condition.…”

Section: Mechanical Testssupporting

confidence: 93%

“…As a comparison, Spierings et al [17] found an average surface hardness of about 135 HB for Scalmalloy specimens heat-treated at 325 • C for 4 hours. That thermal treatment could substantially improve the surface hardness of Scalmalloy has also been recently reported by Raab and Bambach [16]. The authors observed an hardness increase from 99 HB2.5 to 156 HB2.5 by applying an ageing treatment at 325 • C for 2 hours to pristine samples.…”

Section: Mechanical Testssupporting

confidence: 74%

“…Previous works also reported a decrease of the failure strain in heat-treated samples, which was accompanied by an increase of the tensile strength [17,16,18]. Notably, Ren et al [18] found a significant decrease of the ultimate strain in additive manufactured Al-Mg-Sc-Zr alloy subjected to heat treatment at 300 • C for 4 hours.…”

Section: Mechanical Testsmentioning

confidence: 89%

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Preliminary tests on additive-manufactured Al-Sc specimens for the setup of a numerical model for Laser Shock Peening

Zavatta

Troiani

2023

J. Phys.: Conf. Ser.

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Aluminum-Scandium alloys offer a great potential in aerospace applications due their high corrosion resistance and improved strength properties. Furthermore, these alloys have been qualified for laser additive manufacturing (AM), producing parts with static strengths rivalling their conventionally manufactured counterparts. However, laser processing also results in large residual stresses that can severely affect fatigue properties and result in geometric distortion. A proven method for reducing the fatigue-related problems in metallic structures is to drive compressive residual stresses into the affected area by means of Laser Shock Peening (LSP). This surface treatment is very effective in bulk structures, improving life performances of fatigue-sensitive aeronautical components, such as jet engines turbine blades or helicopter gearboxes. On the other hand, quite a limited number of studies has been presented on the effect of LSP on fatigue crack growth in thin components and laser AM structures. This work presents first the results of preliminary tensile tests on additive manufactured Al-Sc specimens. The tensile strengths of as-built and heat-treated samples are compared. Then, a reliable and computationally time-effective numerical model of laser peening is reviewed, referring to case studies investigated earlier. In view of applying LSP to additive manufactured Al-Sc components, the effects of different laser parameters and geometries are discussed. Finally, the possible drawbacks of the LSP treatment are addressed, in order to exploit its full potential in increasing the fatigue life of AM components.

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Section: Mechanical Testssupporting

confidence: 93%

Section: Mechanical Testssupporting

confidence: 74%

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Preliminary tests on additive-manufactured Al-Sc specimens for the setup of a numerical model for Laser Shock Peening

Zavatta

Troiani

2023

J. Phys.: Conf. Ser.

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“…The fatigue strength in this study was described by stress amplitude, which was 235 MPa if converted to maximum stress. Raab and Bambach [ 33 ] had an equivalent material composition and stress ratio to this work but showed higher fatigue value of 265 MPa (maximum stress) on the HIPed samples, in which the porosity was effectively reduced. However, the defects and uneven microstructure in this study adversely affected the fatigue property.…”

Section: Resultsmentioning

confidence: 94%

“…In addition, posttreatment can significantly increase fatigue strength. [ 33 ] Zhao et al [ 34 ] showed that after two stages of heat treatment, the nanoprecipitation uniformly disperses on the Al matrix, which promotes the thermal diffusion of Sc and the precipitation transformation of Al 3 (Sc, Zr), so as to improve the strength, delay the propagation of fatigue cracks, and achieve the balance between tensile properties and fatigue properties. However, the connections between the microstructure, precipitates, and fatigue property of LPBF‐fabricated Al–Mg–Sc–Zr after heat treatment have not been thoroughly studied.…”

Section: Introductionmentioning

confidence: 99%

High Cycle Fatigue Property of Al–Mg–Sc–Zr Alloy Fabricated by Laser Powder Bed Fusion

et al. 2023

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Laser powder bed fusion (LPBF) of high‐strength Al–Mg–Sc–Zr alloy possesses great potential application in the aerospace industry. However, fatigue performance has become a very important issue in the safety and durability design of engineering structures. Herein, the high cycle fatigue property of LPBF‐fabricated Al–Mg–Sc–Zr alloy and its correlation with defects, microstructure, and precipitated phases are studied. The LPBF‐manufactured Al–Mg–Sc–Zr alloy appears heterogeneous structure composed of equiaxed grains at the molten pool boundary and columnar grains at the inner of the molten pool. After aging treatment (325 °C/4 h), the nanosized Al3Sc intragranular particles and Mn‐rich intergranular particles are precipitated, leading to more difficult movement of dislocations that favors the fatigue strength. The ultimate tensile strength of the samples after aging treatment is 507.05 MPa and corresponding 107 cycle fatigue strength (R = −1) is 106 MPa. The fracture morphology of the fatigue specimens shows that the fatigue cracks start from the surface defects with strong stress concentration, especially the lack of fusions, and then expand through the surplus part.

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Investigating the Influence of Iron Content on the Microstructure and Mechanical Properties of a High Strength Al-Alloy for Additive Manufacturing

Turani,

Jannic,

Esteves

et al. 2024

The Minerals, Metals &Amp; Materials Series

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Fatigue properties of Scalmalloy® processed by laser powder bed fusion in as-built, chemically and conventionally machined surface condition

Cited by 12 publications

References 50 publications

Preliminary tests on additive-manufactured Al-Sc specimens for the setup of a numerical model for Laser Shock Peening

Preliminary tests on additive-manufactured Al-Sc specimens for the setup of a numerical model for Laser Shock Peening

High Cycle Fatigue Property of Al–Mg–Sc–Zr Alloy Fabricated by Laser Powder Bed Fusion

Investigating the Influence of Iron Content on the Microstructure and Mechanical Properties of a High Strength Al-Alloy for Additive Manufacturing

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