Cracking during thermal post-processing of laser powder bed fabricated CM247LC Ni-superalloy

Research output: Contribution to journalArticlepeer-review

Standard

Cracking during thermal post-processing of laser powder bed fabricated CM247LC Ni-superalloy. / Boswell, John H.; Clark, Daniel; Li, Wei; Attallah, Moataz M.

In: Materials and Design, Vol. 174, 107793, 15.07.2019.

Research output: Contribution to journalArticlepeer-review

Harvard

APA

Vancouver

Author

Bibtex

@article{f8b0ccdd1e854a25973b30998c8bbd2f,
title = "Cracking during thermal post-processing of laser powder bed fabricated CM247LC Ni-superalloy",
abstract = "The causes of cracking during thermal post-processing of laser powder bed fabricated (LPBF) CM247LC Ni-superalloy have been examined. Micro-hardness measurements and microstructural analyses were undertaken following short aging heat treatments around the phase transformation temperatures identified by Differential Scanning Calorimetry (DSC) analysis of the as-built condition. Results showed a steep increase in cracking density in the samples between 450 °C and 600 °C, which corresponded to changes in the microstructure, hardness, and elastic modulus. A combination of ductility dip cracking and strain age cracking mechanisms were identified as the primary causes of cracking in LPBF CM247LC following post-build thermal treatments. The results of this work shed light on the relationship between the heat treatment temperatures and the onset of post-build cracking, and could help develop post-LPBF heat treatments for high γ′ Ni-superalloys.",
keywords = "Laser powder bed fusion, Mechanical properties, Microstructure, Nickel superalloys",
author = "Boswell, {John H.} and Daniel Clark and Wei Li and Attallah, {Moataz M.}",
year = "2019",
month = jul,
day = "15",
doi = "10.1016/j.matdes.2019.107793",
language = "English",
volume = "174",
journal = "Materials and Design",
issn = "0264-1275",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Cracking during thermal post-processing of laser powder bed fabricated CM247LC Ni-superalloy

AU - Boswell, John H.

AU - Clark, Daniel

AU - Li, Wei

AU - Attallah, Moataz M.

PY - 2019/7/15

Y1 - 2019/7/15

N2 - The causes of cracking during thermal post-processing of laser powder bed fabricated (LPBF) CM247LC Ni-superalloy have been examined. Micro-hardness measurements and microstructural analyses were undertaken following short aging heat treatments around the phase transformation temperatures identified by Differential Scanning Calorimetry (DSC) analysis of the as-built condition. Results showed a steep increase in cracking density in the samples between 450 °C and 600 °C, which corresponded to changes in the microstructure, hardness, and elastic modulus. A combination of ductility dip cracking and strain age cracking mechanisms were identified as the primary causes of cracking in LPBF CM247LC following post-build thermal treatments. The results of this work shed light on the relationship between the heat treatment temperatures and the onset of post-build cracking, and could help develop post-LPBF heat treatments for high γ′ Ni-superalloys.

AB - The causes of cracking during thermal post-processing of laser powder bed fabricated (LPBF) CM247LC Ni-superalloy have been examined. Micro-hardness measurements and microstructural analyses were undertaken following short aging heat treatments around the phase transformation temperatures identified by Differential Scanning Calorimetry (DSC) analysis of the as-built condition. Results showed a steep increase in cracking density in the samples between 450 °C and 600 °C, which corresponded to changes in the microstructure, hardness, and elastic modulus. A combination of ductility dip cracking and strain age cracking mechanisms were identified as the primary causes of cracking in LPBF CM247LC following post-build thermal treatments. The results of this work shed light on the relationship between the heat treatment temperatures and the onset of post-build cracking, and could help develop post-LPBF heat treatments for high γ′ Ni-superalloys.

KW - Laser powder bed fusion

KW - Mechanical properties

KW - Microstructure

KW - Nickel superalloys

UR - http://www.scopus.com/inward/record.url?scp=85064207585&partnerID=8YFLogxK

U2 - 10.1016/j.matdes.2019.107793

DO - 10.1016/j.matdes.2019.107793

M3 - Article

AN - SCOPUS:85064207585

VL - 174

JO - Materials and Design

JF - Materials and Design

SN - 0264-1275

M1 - 107793

ER -