Detail publikace

Atomic resolution characterization of strengthening nanoparticles in a new high-temperature-capable 43Fe-25Ni-22.5Cr austenitic stainless steel

HECZKO, M. ESSER, B. SMITH, T. BERAN, P. MAZÁNOVÁ, V. MCCOMB, D. KRUML, T. POLÁK, J. MILLS, M.

Originální název

Atomic resolution characterization of strengthening nanoparticles in a new high-temperature-capable 43Fe-25Ni-22.5Cr austenitic stainless steel

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Advanced scanning transmission electron microscopy (STEM) was used to study two distinct populations of nanoparticles associated with the extraordinary strengthening of the highly-alloyed austenitic stainless steel Sanicro 25 during cyclic loading at 700 °C. Fully coherent and homogeneously dispersed Cu-rich nanoparticles precipitate rapidly as a result of thermal exposure, along with nanometer-sized incoherent NbC carbides that nucleate on dislocations during the cyclic loading at high temperature. The atomic structure of nanoparticles was investigated by probe-corrected high-angle annular dark-field STEM imaging. Compositional analysis of the nanoparticles was conducted using high spatial resolution energy dispersive X-ray spectroscopy combined with electron energy-loss spectroscopy. Experimental observations were validated by image simulations of the Moiré-like contrast exhibited by NbC carbides. The important role of both nanoparticle populations for the overall cyclic response is discussed. As a result of pinning effects and associated obstacles, dislocation motion is significantly retarded preventing formation of substructures with lower stored internal energy. With recovery heavily suppressed, forest dislocation strengthening supported by precipitation and solid solution hardening, leads to the remarkable increase of cyclic strength at elevated temperatures.

Klíčová slova

Scanning transmission electron microscopy; Austenitic stainless steel; High temperature; Fatigue; Strength; Nanoparticles

Autoři

HECZKO, M.; ESSER, B.; SMITH, T.; BERAN, P.; MAZÁNOVÁ, V.; MCCOMB, D.; KRUML, T.; POLÁK, J.; MILLS, M.

Vydáno

14. 3. 2018

Nakladatel

ELSEVIER SCIENCE SA

Místo

PO BOX 564, 1001 LAUSANNE, SWITZERLAND

ISSN

0921-5093

Periodikum

Materials Science and Engineering A

Ročník

719

Číslo

1

Stát

Švýcarská konfederace

Strany od

49

Strany do

60

Strany počet

11

URL

https://www.sciencedirect.com/science/article/pii/S0921509318301862

BibTex

@article{BUT150954,
  author="Milan {Heczko} and Bryan D. {Esser} and Timothy M. {Smith} and Přemysl {Beran} and Veronika {Mazánová} and David W. {McComb} and Tomáš {Kruml} and Jaroslav {Polák} and Michael J. {Mills}",
  title="Atomic resolution characterization of strengthening nanoparticles in a new high-temperature-capable 43Fe-25Ni-22.5Cr austenitic stainless steel",
  journal="Materials Science and Engineering A",
  year="2018",
  volume="719",
  number="1",
  pages="49--60",
  doi="10.1016/j.msea.2018.02.004",
  issn="0921-5093",
  url="https://www.sciencedirect.com/science/article/pii/S0921509318301862"
}