Comparison of Laser Powder Bed Fusion and Cast Inconel 713 Alloy in Terms of Their Microstructure, Mechanical Properties, and Fatigue Life

Zhao, Jun-Ren; Hung, Fei-Yi; Lu, Chien-Sheng; Lai, I-Rue

doi:10.1002/adem.202001366

Cited by 10 publications

(3 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Laser powder-bed fusion (L-PBF) is one of the laser-based additive manufacturing methods with the capability of higher shape precision, lower material waste, and fewer processing steps than conventional manufacturing technologies [8,9]. The mechanical properties of as-printed samples are often reported as higher-strength but lower-ductility compared to the casting or wrought parts [10,11]. Although a good combination of strength and ductility can be achieved in some metals and alloys, the spatial heating and cooling cycle during L-PBF often induce nonequilibrium and anisotropic structures [12,13], as well as high-density dislocations, which greatly impair the mechanical properties of as-printed materials.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Fracture Behavior of Laser Powder-Bed-Fused GH3536 Superalloy

Qing

Zhang

et al. 2022

Metals

View full text Add to dashboard Cite

Heat treatment (HT) is an important approach to tune the structure and mechanical properties of as-printed or hot-isostatic-pressed (HIPed) additive manufacturing materials. Due to the carbide precipitates extensively existing after HT with air cooling, this paper studies the microstructure and mechanical behavior of laser powder-bed-fused (L-PBFed) GH3536 superalloy with laminar carbide precipitates at grain boundaries. By comparing with air-cooling samples and water-quenched samples, the results revealed that air cooling often introduced precipitates at grain boundaries, which impede the plastic deformation and are prone to lead to severe transgranular cracks on the fracture surface, contributing to a higher strain-hardening rate but lower ductility of HTed sample. Water quench can largely eliminate the grain-boundary precipitates, contributing to an optimized ductility even with smaller grain size. This work provides more details on the precipitate-deformation relation after HT.

show abstract

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Fracture Behavior of Laser Powder-Bed-Fused GH3536 Superalloy

Qing

Zhang

et al. 2022

Metals

View full text Add to dashboard Cite

show abstract

“…Generally, Ni-based superalloys can be classified into three types of strengthening mechanisms: solid solution-strengthened alloys (typically Hastelloy-X [28]), γ" (Ni 3 Nb phase) precipitation-strengthened alloys (typically IN718 [29]), and γ' (Ni 3 (Al, Ti) phase) precipitation-strengthened alloys (IN939 [30], IN738LC [31], IN713LC [32], and CM247LC [33]). Among these superalloys, the γ' precipitation-strengthened alloys with the highest strength at high temperatures were created by a combination of complex techniques such as precipitate design, anisotropic crystallographic orientation control, and grain boundary strengthening [34].…”

Section: Introductionmentioning

confidence: 99%

“…Further studies on the recrystallization process, such as the effect of carbide formation on recrystallization [36], are required. Kanagarajah et al [30] and Zhao et al [32] examined the anisotropy of tensile properties between the vertical (building direction) and horizontal directions. Although low ductility was observed in horizontal tests, a detailed discussion on the relationship between the anisotropy of the tensile properties, low ductility, microstructure evolution via the LPBF process, and recrystallization during heat treatment has not been performed.…”

Section: Introductionmentioning

confidence: 99%

Effects of Recrystallization on Tensile Anisotropic Properties for IN738LC Fabricated by Laser Powder Bed Fusion

et al. 2022

View full text Add to dashboard Cite

This study demonstrates the effects of recrystallization on tensile properties and the anisotropy of IN738LC, a typical γ’ precipitation-strengthened alloy, at both room and high temperatures via the laser powder bed fusion process. The nonrecrystallized columnar microstructure, subjected to standard IN738LC heat treatment up to 1120 °C, and the almost fully recrystallized microstructure, heat-treated at 1204 °C, were compared. The tensile properties strongly depend on whether recrystallization was completed as well as the tensile direction. This can be explained by microstructure characterization, featuring the Taylor factor in the tensile direction, average grain size estimated by ellipse approximation, and the relationship between the grain shape and tensile direction. The shape of the recrystallized grains and the distribution of coarse MC carbides inside the recrystallized grains were determined by the microstructure in an as-built state. In high-temperature tensile tests conducted in the horizontal direction, the separation of the columnar grains caused a brittle fracture. In contrast, dimples were observed at the fracture surface after recrystallization, indicating scope for further improvement in ductility.

show abstract

Robust Metal Additive Manufacturing Process Selection and Development for Aerospace Components

Gradl

Tinker

Park

et al. 2022

J. of Materi Eng and Perform

View full text Add to dashboard Cite

Metal additive manufacturing (AM) encapsulates the myriad of manufacturing processes available to meet industrial needs. Determining which of these AM processes is best for a specific aerospace application can be overwhelming. Based on the application, each of these AM processes has advantages and challenges. The most common metal AM methods in use include Powder Bed Fusion, Directed Energy Deposition, and various solid-state processes. Within each of these processes, there are different energy sources and feedstock requirements. Component requirements heavily affect the process determination, despite existing literature on these AM processes (often inclusive of input parameters and material properties). This article provides an overview of the considerations taken for metal AM process selection for aerospace components based on various attributes. These attributes include geometric considerations, metallurgical characteristics and properties, cost basis, post-processing, and industrialization supply chain maturity. To provide information for trade studies and selection, data on these attributes were compiled through literature reviews, internal NASA studies, as well as academic and industry partner studies and data. These studies include multiple AM components and sample build experiments to evaluate (1) material and geometric variations and constraints within the processes, (2) alloy characterization and mechanical testing, (3) pathfinder component development and hot-fire evaluations, and (4) qualification approaches. This article summarizes these results and is meant to introduce various considerations when designing a metal AM component.

show abstract

Comparison of Laser Powder Bed Fusion and Cast Inconel 713 Alloy in Terms of Their Microstructure, Mechanical Properties, and Fatigue Life

Cited by 10 publications

References 43 publications

Mechanical Properties and Fracture Behavior of Laser Powder-Bed-Fused GH3536 Superalloy

Mechanical Properties and Fracture Behavior of Laser Powder-Bed-Fused GH3536 Superalloy

Effects of Recrystallization on Tensile Anisotropic Properties for IN738LC Fabricated by Laser Powder Bed Fusion

Robust Metal Additive Manufacturing Process Selection and Development for Aerospace Components

Contact Info

Product

Resources

About