Improving the Fatigue Strength of Laser Powder Bed‐Fused AISI M3:2 by Hot Isostatic Pressing

Qin, Siyuan; Herzog, Simone; Kaletsch, Anke; Broeckmann, Christoph

doi:10.1002/srin.202200435

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…The HIP process is also suitable for the postdensification of additively manufactured materials and, thus, optimizing their mechanical properties. In particular, fatigue strength can be significantly increased via HIP posttreatment [26][27][28][29][30][31], due to minimizing the fatigue critical defects like the lack of fusion (LOF), microcracks, and porosity. HIP can also have a positive effect on the creep properties of PBF-LB manufactured materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Build Orientations and Heat Treatments on the Creep Properties of Inconel 718 Produced by PBF-LB

2023

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Inconel 718 is a nickel-based superalloy with excellent creep properties and good tensile and fatigue strength. In the field of additive manufacturing, it is a versatile and widely used alloy due to its good processability in the powder bed fusion with laser beam (PBF-LB) process. The microstructure and mechanical properties of the alloy produced by PBF-LB have already been studied in detail. However, there are fewer studies on the creep resistance of additively manufactured Inconel 718, especially when the focus is on the build direction dependence and post-treatment by hot isostatic pressing (HIP). Creep resistance is a crucial mechanical property for high-temperature applications. In this study, the creep behavior of additively manufactured Inconel 718 was investigated in different build orientations and after two different heat treatments. The two heat treatment conditions are, first, solution annealing at 980 °C followed by aging and, second, HIP with rapid cooling followed by aging. The creep tests were performed at 760 °C and at four different stress levels between 130 MPa and 250 MPa. A slight influence of the build direction on the creep properties was detected, but a more significant influence was shown for the different heat treatments. The specimens after HIP heat treatment show much better creep resistance than the specimens subjected to solution annealing at 980 °C with subsequent aging.

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Section: Introductionmentioning

confidence: 99%

Influence of Different Build Orientations and Heat Treatments on the Creep Properties of Inconel 718 Produced by PBF-LB

2023

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“…One example are turbine blades for aircraft engines. Additionally, for materials produced by AM processes such as laser powder bed fusion (PBF-LB), HIP post-densification can provide remarkable improvement in reliability and mechanical properties [15][16][17][18][19]. To achieve densification without encapsulating the materials in the HIP process, no open porosity is permitted in the component, as the applied gas pressure would also act within the pores and these could not be closed.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hot Isostatic Pressing on Microstructure and Tensile Properties of Nickel-Free Stainless Steel for Metal Binder Jetting

Kaletsch,

Radtke,

Herzog

et al. 2023

Applied Sciences

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Additive manufacturing processes continue to grow in popularity. Hereby, metal binder jetting (MBJ) has a high potential for series production of highly complex parts with added value compared to other production technologies. Applications already exist in thermal management, filtering, or fluid distribution. As with beam-based additive manufacturing processes, the materials available for MBJ are still limited. Especially in the area of nickel-free stainless steels; for example, for medical applications, there are hardly any options available. Therefore, this study investigates a newly developed nickel-free stainless steel specifically designed for the MBJ process. Particular attention is paid to the microstructure and the mechanical properties such as hardness and tensile strength. In addition, the investigation focuses on the potential of hot isostatic pressing (HIP) after sintering to favorably influence the microstructure and the mechanical properties. The results show that in the as-sintered state, a maximum porosity of 2.8% is present, which can be completely removed by hot isostatic post-densification. HIP post-densification improves both the yield strength and the tensile strength by about 10%. The increase in elongation at break is around 50%.

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Advancements in micromachining of additive manufactured materials: a comprehensive review

Manikandan,

Venkatesan

2024

Materials and Manufacturing Processes

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Improving the Fatigue Strength of Laser Powder Bed‐Fused AISI M3:2 by Hot Isostatic Pressing

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/srin.202200435.

Cited by 3 publications

References 29 publications

Influence of Different Build Orientations and Heat Treatments on the Creep Properties of Inconel 718 Produced by PBF-LB

Influence of Different Build Orientations and Heat Treatments on the Creep Properties of Inconel 718 Produced by PBF-LB

Influence of Hot Isostatic Pressing on Microstructure and Tensile Properties of Nickel-Free Stainless Steel for Metal Binder Jetting

Advancements in micromachining of additive manufactured materials: a comprehensive review

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