Ni Based Superalloys

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Ni Based Superalloys

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Author : James Coakley
language : en
Publisher: Trans Tech Publications Ltd
Release Date : 2020-07-28

Ni Based Superalloys written by James Coakley and has been published by Trans Tech Publications Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-07-28 with Technology & Engineering categories.

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Alloy Design And Characterization Of Strengthened Nickel Based Superalloys For Additive Manufacturing

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Author : Jinghao Xu
language : en
Publisher: Linköping University Electronic Press
Release Date : 2021-01-28

Alloy Design And Characterization Of Strengthened Nickel Based Superalloys For Additive Manufacturing written by Jinghao Xu and has been published by Linköping University Electronic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-01-28 with Electronic books categories.

Nickel-based superalloys, an alloy system bases on nickel as the matrix element with the addition of up to 10 more alloying elements including chromium, aluminum, cobalt, tungsten, molybdenum, titanium, and so on. Through the development and improvement of nickel-based superalloys in the past century, they are well proved to show excellent performance at the elevated service temperature. Owing to the combination of extraordinary high-temperature mechanical properties, such as monotonic and cyclic deformation resistance, fatigue crack propagation resistance; and high-temperature chemical properties, such as corrosion and oxidation resistance, phase stability, nickel-based superalloys are widely used in the critical hot-section components in aerospace and energy generation industries. The success of nickel-based superalloy systems attributes to both the well-tailored microstructures with the assistance of carefully doped alloying elements, and the intently developed manufacturing processes. The microstructure of the modern nickel-based superalloys consists of a two-phase configuration: the intermetallic precipitates (Ni,Co)3(Al,Ti,Ta) known as γ′ phase dispersed into the austenite γ matrix, which is firstly introduced in the 1940s. The recently developed additive manufacturing (AM) techniques, acting as the disruptive manufacturing process, offers a new avenue for producing the nickel-based superalloy components with complicated geometries. However, γ′ strengthened nickel-based superalloys always suffer from the micro-cracking during the AM process, which is barely eliminated by the process optimization. On this basis, the new compositions of γ′ strengthened nickel-based superalloy adapted to the AM process are of great interest and significance. This study sought to design novel γ′ strengthened nickel-based superalloys readily for AM process with limited cracking susceptibility, based on the understanding of the cracking mechanisms. A two-parameter model is developed to predict the additive manufacturability for any given composition of a nickel-based superalloy. One materials index is derived from the comparison of the deformation-resistant capacity between dendritic and interdendritic regions, while another index is derived from the difference of heat resistant capacity of these two spaces. By plotting the additive manufacturability diagram, the superalloys family can be categorized into the easy-to-weld, fairly-weldable, and non-weldable regime with the good agreement of the existed knowledge. To design a novel superalloy, a Cr-Co-Mo-W-Al-Ti-Ta-Nb-Fe-Ni alloy family is proposed containing 921,600 composition recipes in total. Through the examination of additive manufacturability, undesired phase formation propensity, and the precipitation fraction, one composition of superalloy, MAD542, out of the 921,600 candidates is selected. Validation of additive manufacturability of MAD542 is carried out by laser powder bed fusion (LPBF). By optimizing the LPBF process parameters, the crack-free MAD542 part is achieved. In addition, the MAD542 superalloy shows great resistance to the post-processing treatment-induced cracking. During the post-processing treatment, extensive annealing twins are promoted to achieve the recrystallization microstructure, ensuring the rapid reduction of stored energy. After ageing treatment, up to 60-65% volume fraction of γ′ precipitates are developed, indicating the huge potential of γ′ formation. Examined by the high-temperature slow strain rate tensile and constant loading creep testing, the MAD542 superalloy shows superior strength than the LPBF processed and hot isostatic pressed plus heat-treated IN738LC superalloy. While the low ductility of MAD542 is existed, which is expected to be improved by modifying the post-processing treatment scenarios and by the adjusting building direction in the following stages of the Ph.D. research. MAD542 superalloy so far shows both good additive manufacturability and mechanical potentials. Additionally, the results in this study will contribute to a novel paradigm for alloy design and encourage more γ′-strengthened nickel-based superalloys tailored for AM processes in the future.

Superalloys Ii

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Author : Soran Birosca
language : en
Publisher: Trans Tech Publications Ltd
Release Date : 2020-08-21

Superalloys Ii written by Soran Birosca and has been published by Trans Tech Publications Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-08-21 with Science categories.

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Weldability Of A Nickel Based Superalloy

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Author :
language : en
Publisher:
Release Date : 1994

Weldability Of A Nickel Based Superalloy written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.

Semi Solid Of Alloys And Composites Xvi

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Author : Jiehua Li
language : en
Publisher: Trans Tech Publications Ltd
Release Date : 2022-01-10

Semi Solid Of Alloys And Composites Xvi written by Jiehua Li and has been published by Trans Tech Publications Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-01-10 with Science categories.

Selected peer-reviewed full text papers from the 16th International Conference on Semi-Solid Processing of Alloys and Composites (S2P 2021) Selected peer-reviewed full text papers from the 16th International Conference on Semi-Solid Processing of Alloys and Composites (S2P 2021), September 28-30, 2021, Leoben, Austria

Technologies And Properties Of Modern Utility Materials Xxiii

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Author : Agnieszka Szczotok
language : en
Publisher: Trans Tech Publications Ltd
Release Date : 2016-02-10

Technologies And Properties Of Modern Utility Materials Xxiii written by Agnieszka Szczotok and has been published by Trans Tech Publications Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-02-10 with Technology & Engineering categories.

Selected, peer reviewed papers from the XXIII Conference on Technologies and Properties of Modern Utility Materials (TPMUM 2015), May 15, 2015, Katowice, Poland

Thermodynamic Description Of Multicomponent Ni Base Superalloys Containing Al Cr Ru And Pt

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Author : Jun Zhu
language : en
Publisher:
Release Date : 2008

Thermodynamic Description Of Multicomponent Ni Base Superalloys Containing Al Cr Ru And Pt written by Jun Zhu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.

The Design And Development Of A New Nickel Base Superalloy Ws 900 For Additive Manufacturing

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Author : Husam Alrehaili
language : en
Publisher:
Release Date : 2018

The Design And Development Of A New Nickel Base Superalloy Ws 900 For Additive Manufacturing written by Husam Alrehaili and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Materials science categories.

Ni-based superalloys are known for their ability to withstand and retain their mechanical and physical properties at elevated operating temperature, which makes them suitable for gas turbine and jet engine components. The outstanding properties of Ni-based superalloys have made them as an interesting candidate to process by Additive Manufacturing (AM). Although some Ni-based superalloys were successfully processed by AM, others were difficult to process by using this technique. Therefore, the need for new alloys, developed primarily for AM, has increased. This work presents a newly developed Ni-based superalloy "WSU 900" that was processed by using direct laser metal deposition (LMD) coupled with computational thermodynamics and phase diagram simulations. Microstructural and mechanical properties of the as-deposited and heat-treated WSU 900 alloy were studied. This new alloy shows good mechanical properties at room temperature. As-deposited condition revealed YS=951 MPa, UTS=1248 MPa, and elongation=19.2%. In the heat-treated conditions, 2 hours aged (YS=1076 MPa, UTS=1401 MPa, and elongation=14.9%), 8 hours aged (YS=1075 MPa, UTS=1376 MPa, and elongation=14.9 %), and 16 hours aged (YS=1162 MPa, UTS=1469 MPa, and elongation=11.9%).

Mechanical Engineering Materials Science And Civil Engineering

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Author : Jing Wei Zhao
language : en
Publisher: Trans Tech Publications Ltd
Release Date : 2022-06-01

Mechanical Engineering Materials Science And Civil Engineering written by Jing Wei Zhao and has been published by Trans Tech Publications Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-06-01 with Technology & Engineering categories.

Selected peer-reviewed extended articles based on abstracts presented at the 9th International Conference on Mechanical Engineering, Materials Science and Civil Engineering (ICMEMSCE 2021) Aggregated Book

High Temperature Corrosion And Protection Of Materials 7

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Author : Pierre Steinmetz
language : en
Publisher: Trans Tech Publications Ltd
Release Date : 2008-09-09

High Temperature Corrosion And Protection Of Materials 7 written by Pierre Steinmetz and has been published by Trans Tech Publications Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-09-09 with Technology & Engineering categories.

HTPCM 7 Selected, peer reviewed papers from 7th International Symposium on High Temperature Corrosion and Protection of Materials, Les Embiez, France, May 18-23 2008