Publication result detail

High-temperature low-cycle fatigue behaviour of HIP treated and untreated superalloy MAR-M247

ŠULÁK, I.; OBRTLÍK, K.; ČELKO, L.

Original Title

High-temperature low-cycle fatigue behaviour of HIP treated and untreated superalloy MAR-M247

English Title

High-temperature low-cycle fatigue behaviour of HIP treated and untreated superalloy MAR-M247

Type

WoS Article

Original Abstract

The effect of hot isostatic pressing (HIP) treatment on high-temperature low cycle fatigue (LCF) behaviour of γ  precipitation strengthened nickel-based superalloy MAR-M247 was studied. Microstructural observations revealed coarse-grained dendritic structure with an average grain size of 2.1 mm. Distribution and size of casting defects were assessed on cross sections of both HIP treated and untreated MAR-M247. Shape and size of precipitates were documented. Vickers hardness tests did not reveal differences between both materials. Untreated specimens were cyclically strained under total strain control at 900◦C. Likewise, tests were performed on the HIP treated material at temperatures of 900 and 950◦C. The stress- -strain response was recorded. Coffin-Manson and Basquin fatigue life curves were established. HIP treatment leads to an increase of lifetime in comparison with the untreated material. Precipitate depleted zone was observed and crack initiation sites were identified. Dislocation arrangements were studied in TEM. Planar bands containing antiphase boundaries were observed.

English abstract

The effect of hot isostatic pressing (HIP) treatment on high-temperature low cycle fatigue (LCF) behaviour of γ  precipitation strengthened nickel-based superalloy MAR-M247 was studied. Microstructural observations revealed coarse-grained dendritic structure with an average grain size of 2.1 mm. Distribution and size of casting defects were assessed on cross sections of both HIP treated and untreated MAR-M247. Shape and size of precipitates were documented. Vickers hardness tests did not reveal differences between both materials. Untreated specimens were cyclically strained under total strain control at 900◦C. Likewise, tests were performed on the HIP treated material at temperatures of 900 and 950◦C. The stress- -strain response was recorded. Coffin-Manson and Basquin fatigue life curves were established. HIP treatment leads to an increase of lifetime in comparison with the untreated material. Precipitate depleted zone was observed and crack initiation sites were identified. Dislocation arrangements were studied in TEM. Planar bands containing antiphase boundaries were observed.

Keywords

hot isostatic pressing; Ni-based superalloy; high-temperature low cycle fatigue; fatigue life curves; dislocation structures; planar bands

Key words in English

hot isostatic pressing; Ni-based superalloy; high-temperature low cycle fatigue; fatigue life curves; dislocation structures; planar bands

Authors

ŠULÁK, I.; OBRTLÍK, K.; ČELKO, L.

RIV year

2017

Released

01.06.2016

Publisher

Slovak Academy of Science

Location

Slovak Republic

ISBN

1338-4252

Periodical

KOVOVE MATERIALY-METALLIC MATERIALS

Volume

54

Number

6

State

Slovak Republic

Pages from

471

Pages to

481

Pages count

11

URL

http://www.kovmat.sav.sk/abstract.php?rr=54&cc=6&ss=471

BibTex

@article{BUT130385,
  author="Ivo {Šulák} and Karel {Obrtlík} and Ladislav {Čelko}",
  title="High-temperature low-cycle fatigue behaviour of HIP treated and untreated superalloy MAR-M247",
  journal="KOVOVE MATERIALY-METALLIC MATERIALS",
  year="2016",
  volume="54",
  number="6",
  pages="471--481",
  doi="10.4149/km\{_}2016\{_}6\{_}471",
  issn="0023-432X",
  url="http://www.kovmat.sav.sk/abstract.php?rr=54&cc=6&ss=471"
}