A generalised hot cracking criterion for nickel-based superalloys additively manufactured by electron beam melting
The influences of microstructure and solidification parameters on the hot cracking behaviour of an additively manufactured Ni-based superalloy via selective electron beam melting (SEBM) have been investigated. Severe intergranular hot cracking is found to occur at grain boundaries (GBs) in the SEBM-...
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sg-ntu-dr.10356-1482582021-05-08T20:11:46Z A generalised hot cracking criterion for nickel-based superalloys additively manufactured by electron beam melting Chandra, Shubham Tan, Xipeng Narayan, R. Lakshmi Wang, Chengcheng Tor, Shu Beng Seet, Gerald School of Mechanical and Aerospace Engineering Singapore Centre for 3D Printing Engineering Additive Manufacturing Electron Beam Melting The influences of microstructure and solidification parameters on the hot cracking behaviour of an additively manufactured Ni-based superalloy via selective electron beam melting (SEBM) have been investigated. Severe intergranular hot cracking is found to occur at grain boundaries (GBs) in the SEBM-built superalloy. A generalised cracking criterion that considers various process parameters along with the GB inclination is developed on the basis of a prevailing hot cracking criterion for columnar-grained microstructure. A parametric evaluation of influencing factors is quantitatively conducted to predict the optimal conditions that could prevent hot cracking while maintaining the desirable fine microstructure. With the aid of numerical simulations, it is determined that while micro-segregation occurs at all types of GBs, its occurrence at the divergent ones tend to promote cracking. Using the results of this work, hot cracking in additively manufactured Ni-based superalloy single crystals can be potentially mitigated. National Research Foundation (NRF) Accepted version 2021-05-03T06:11:15Z 2021-05-03T06:11:15Z 2021 Journal Article Chandra, S., Tan, X., Narayan, R. L., Wang, C., Tor, S. B. & Seet, G. (2021). A generalised hot cracking criterion for nickel-based superalloys additively manufactured by electron beam melting. Additive Manufacturing, 37, 101633-. https://dx.doi.org/10.1016/j.addma.2020.101633 2214-8604 https://hdl.handle.net/10356/148258 10.1016/j.addma.2020.101633 2-s2.0-85092232542 37 101633 en Additive Manufacturing © 2020 Elsevier B.V. All rights reserved. This paper was published in Additive Manufacturing and is made available with permission of Elsevier B.V. application/pdf |
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Engineering Additive Manufacturing Electron Beam Melting Chandra, Shubham Tan, Xipeng Narayan, R. Lakshmi Wang, Chengcheng Tor, Shu Beng Seet, Gerald A generalised hot cracking criterion for nickel-based superalloys additively manufactured by electron beam melting |
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The influences of microstructure and solidification parameters on the hot cracking behaviour of an additively manufactured Ni-based superalloy via selective electron beam melting (SEBM) have been investigated. Severe intergranular hot cracking is found to occur at grain boundaries (GBs) in the SEBM-built superalloy. A generalised cracking criterion that considers various process parameters along with the GB inclination is developed on the basis of a prevailing hot cracking criterion for columnar-grained microstructure. A parametric evaluation of influencing factors is quantitatively conducted to predict the optimal conditions that could prevent hot cracking while maintaining the desirable fine microstructure. With the aid of numerical simulations, it is determined that while micro-segregation occurs at all types of GBs, its occurrence at the divergent ones tend to promote cracking. Using the results of this work, hot cracking in additively manufactured Ni-based superalloy single crystals can be potentially mitigated. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Chandra, Shubham Tan, Xipeng Narayan, R. Lakshmi Wang, Chengcheng Tor, Shu Beng Seet, Gerald |
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Article |
author |
Chandra, Shubham Tan, Xipeng Narayan, R. Lakshmi Wang, Chengcheng Tor, Shu Beng Seet, Gerald |
author_sort |
Chandra, Shubham |
title |
A generalised hot cracking criterion for nickel-based superalloys additively manufactured by electron beam melting |
title_short |
A generalised hot cracking criterion for nickel-based superalloys additively manufactured by electron beam melting |
title_full |
A generalised hot cracking criterion for nickel-based superalloys additively manufactured by electron beam melting |
title_fullStr |
A generalised hot cracking criterion for nickel-based superalloys additively manufactured by electron beam melting |
title_full_unstemmed |
A generalised hot cracking criterion for nickel-based superalloys additively manufactured by electron beam melting |
title_sort |
generalised hot cracking criterion for nickel-based superalloys additively manufactured by electron beam melting |
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2021 |
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https://hdl.handle.net/10356/148258 |
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1699245904378200064 |