On the rejuvenation of crept Ni-Base single crystal superalloys (SX) by hot isostatic pressing (HIP)

Horst, Oliver Martin; Ruttert, Benjamin; Bürger, David; Heep, L.; Wang, Hongcai; Dlouhý, A.; Theisen, W.; Eggeler, Gunther

doi:10.1016/j.msea.2019.04.078

Cited by 36 publications

(16 citation statements)

References 65 publications

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“…In this process, high temperature and pressure were applied to the product in an inert environment [138]. In the most recent studies, the effect of the HIP method on microstructure and mechanical properties of different materials such as Ti6Al4V [139,140], Ni-base single crystal [141], ALSi10Mg [142] and copper [143] were investigated. In general, the results of these studies showed that in the following HIP treatment, the internal pores were reduced, and the tensile strength was reduced due to the microstructure changes.…”

Section: Post Processingmentioning

confidence: 99%

Advances in Metal Additive Manufacturing: A Review of Common Processes, Industrial Applications, and Current Challenges

et al. 2021

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In recent years, Additive Manufacturing (AM), also called 3D printing, has been expanding into several industrial sectors due to the technology providing opportunities in terms of improved functionality, productivity, and competitiveness. While metal AM technologies have almost unlimited potential, and the range of applications has increased in recent years, industries have faced challenges in the adoption of these technologies and coping with a turbulent market. Despite the extensive work that has been completed on the properties of metal AM materials, there is still a need of a robust understanding of processes, challenges, application-specific needs, and considerations associated with these technologies. Therefore, the goal of this study is to present a comprehensive review of the most common metal AM technologies, an exploration of metal AM advancements, and industrial applications for the different AM technologies across various industry sectors. This study also outlines current limitations and challenges, which prevent industries to fully benefit from the metal AM opportunities, including production volume, standards compliance, post processing, product quality, maintenance, and materials range. Overall, this paper provides a survey as the benchmark for future industrial applications and research and development projects, in order to assist industries in selecting a suitable AM technology for their application.

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Section: Post Processingmentioning

confidence: 99%

Advances in Metal Additive Manufacturing: A Review of Common Processes, Industrial Applications, and Current Challenges

et al. 2021

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“…The images were sorted according to the classes of creep strain levels ranging from 0.0%-0.4%, 0.4%-0.6%, 0.6%-0.8%, and 0.8%-1.0%. The experimental images were provided by researchers from the Lehrstuhl für Werkstoffwissenschaft, Institute for Materials, Ruhr-University Bochum [35,36]. The images were obtained from dendritic regions in ERBO/1 single-crystal nickel-based superalloy with varying strain levels, as shown in figure 8.…”

Section: Datasetmentioning

confidence: 99%

Microstructure property classification of nickel-based superalloys using deep learning

Nwachukwu

Obaied

Horst

et al. 2022

Modelling Simul. Mater. Sci. Eng.

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Nickel-based superalloys have a wide range of applications in high temperature and stress domains due to their unique mechanical properties. Under mechanical loading at high temperatures, rafting occurs, which reduces the service life of these materials. Rafting is heavily affected by the loading conditions associated with plastic strain; therefore, understanding plastic strain evolution can help understand these material’s service life. This research classifies nickel-based superalloys with respect to creep strain with deep learning techniques, a technique that eliminates the need for manual feature extraction of complex microstructures. Phase-field simulation data that displayed similar results to experiments were used to build a model with pre-trained neural networks with several convolutional neural network architectures and hyper-parameters. The optimized hyper-parameters were transferred to scanning electron microscopy images of nickel-based superalloys to build a new model. This fine-tuning process helped mitigate the effect of a small experimental dataset. The built models achieved a classification accuracy of 97.74% on phase-field data and 100% accuracy on experimental data after fine-tuning.

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“…All details of the HIP rejuvenation procedure and the benefits on creep life have been described elsewhere. [4][5][6] The HIP rejuvenation treatment has shown its beneficial impact on microstructures that suffered creep degradation (rafting, creep pores). It has been proved that it is possible to re-establish the original c/c¢ microstructure and simultaneously to close initial cast pores and creep pores.…”

Section: B Rejuvenationmentioning

confidence: 99%

“…Consequently, the HIP rejuvenation resulted in an overall prolonged creep life. [4][5][6] The fatigue specimen investigated here underwent HIP rejuvenation but no further thermal treatment.…”

Section: B Rejuvenationmentioning

confidence: 99%

“…Integrated HIP rejuvenation heat treatment has been carried out in the past successfully on specimens of CMSX-4 type material after interrupted creep tests, resulting in a high creep life time in repeated creep test due to the recovering of rafted c-c¢ microstructure and annihilating porosity. [4][5][6] A positive effect of integrated HIP rejuvenation heat treatment on low-cycle fatigue (LCF) behavior has been shown for CMSX-4 material processed by casting or electron beam powder bed fusion (EPBF), respectively. [7] In this study, the microstructure of cast CMSX-4 material of a fatigue specimen has been characterized at first after the specimen fractured in LCF experiment and secondly after subsequent HIP rejuvenation heat treatment.…”

Section: Introductionmentioning

confidence: 99%

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Combining 2D and 3D Characterization Techniques for Determining Effects of HIP Rejuvenation After Fatigue Testing of SX Microstructures

Dennstedt

Lopez‐Galilea

Ruttert

et al. 2022

Metall Mater Trans A

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A hot isostatic pressing rejuvenation heat treatment is applied to a CMSX-4 type SX superalloy after it has been subjected to a low-cycle fatigue test to rupture. The evolution of microstructural defects, such as pores and cracks which are present after fatigue, has been tracked in 3D by X-ray tomography before and after rejuvenation. From the rejuvenated specimen, series of metallographic cross sections were prepared and investigated by scanning electron microscopy for getting complementary 2D information at high resolution. The micrographs were stitched to a panorama which was then matched into the 3D representation of the specimen volume. By combining 3D and 2D data, statistical volume-related quantities were achieved, while detailed characteristics have been assigned to individual defects present in the 2D panorama micrograph. This technique is in general appropriate for length-scale bridging microstructural investigations. Results of the performed investigations concerning the rejuvenation effect on the microstructure are presented and discussed.

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On the rejuvenation of crept Ni-Base single crystal superalloys (SX) by hot isostatic pressing (HIP)

Cited by 36 publications

References 65 publications

Advances in Metal Additive Manufacturing: A Review of Common Processes, Industrial Applications, and Current Challenges

Advances in Metal Additive Manufacturing: A Review of Common Processes, Industrial Applications, and Current Challenges

Microstructure property classification of nickel-based superalloys using deep learning

Combining 2D and 3D Characterization Techniques for Determining Effects of HIP Rejuvenation After Fatigue Testing of SX Microstructures

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