Next Article in Journal
Temperature-Dependent Helium Ion-Beam Mixing in an Amorphous SiOC/Crystalline Fe Composite
Next Article in Special Issue
Sputtering Power Effects on Growth and Mechanical Properties of Cr2AlC MAX Phase Coatings
Previous Article in Journal
Influence of Alloying Treatment and Rapid Solidification on the Degradation Behavior and Mechanical Properties of Mg
Previous Article in Special Issue
Effects of the Hot Isostatic Pressing Process on Crack Healing of the Laser Repair-Welded CM247LC Superalloy
Article Menu

Export Article

Open AccessFeature PaperArticle
Metals 2016, 6(11), 258; doi:10.3390/met6110258

Transmission Electron Microscopy of a CMSX-4 Ni-Base Superalloy Produced by Selective Electron Beam Melting

1
Institut für Werkstoffe, Ruhr-Universität Bochum, Universitätsstr. 150, Bochum 44801, Germany
2
Lehrstuhl WTM, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 5, Erlangen 91058, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Jonathan Cormier
Received: 12 September 2016 / Revised: 16 October 2016 / Accepted: 21 October 2016 / Published: 28 October 2016
(This article belongs to the Special Issue Ni- and Co-Based Superalloys and Their Coatings)
View Full-Text   |   Download PDF [6662 KB, uploaded 28 October 2016]   |  

Abstract

In this work, the microstructures of superalloy specimens produced using selective electron beam melting additive manufacturing were characterized. The materials were produced using a CMSX-4 powder. Two selective electron beam melting processing strategies, which result in higher and lower effective cooling rates, are described. Orientation imaging microscopy, scanning transmission electron microscopy and conventional high resolution transmission electron microscopy are used to investigate the microstructures. Our results suggest that selective electron beam melting processing results in near equilibrium microstructures, as far as γ′ volume fractions, the formation of small amounts of TCP phases and the partitioning behavior of the alloy elements are concerned. As expected, higher cooling rates result in smaller dendrite spacings, which are two orders of magnitude smaller than observed during conventional single crystal casting. During processing, columnar grains grow in <100> directions, which are rotated with respect to each other. There are coarse γ/γ′ microstructures in high angle boundary regions. Dislocation networks form low angle boundaries. A striking feature of the as processed selective electron beam melting specimens is their high dislocation density. From a fundamental point of view, this opens new possibilities for the investigation of elementary dislocation processes which accompany solidification. View Full-Text
Keywords: Ni-base superalloy; selective electron beam melting; evolution of microstructure; transmission electron microscopy; ingrown dislocations Ni-base superalloy; selective electron beam melting; evolution of microstructure; transmission electron microscopy; ingrown dislocations
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Parsa, A.B.; Ramsperger, M.; Kostka, A.; Somsen, C.; Körner, C.; Eggeler, G. Transmission Electron Microscopy of a CMSX-4 Ni-Base Superalloy Produced by Selective Electron Beam Melting. Metals 2016, 6, 258.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top