Microstructural investigation of CoNiCrAlY coated Ni-based single crystal superalloy prepared by LPPS

Takashi Sakai, Mitsuhiro Shibata, Hideyuki Murakami, Seiji Kuroda

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Recent demand in increasing the efficiency of gas turbines has led the component materials to be exposed at much higher operating temperatures, which accordingly accelerates the microstructural deterioration of the coated materials, mainly caused by the interaction between the coated layer and the substrate. Therefore, controlling the chemistry of interfaces by the coating process is one of the most important keys to minimizing the microstructural changes during service. In this study, effects of surface treatments and coating conditions on microstructure changes of Ni-based superalloy substrates were investigated. CoNiCrAlY (AMDRY 9954) powder was coated on Ni-based single crystal superalloy TMS-82+ by low pressure plasma spraying (LPPS). It was found that grit-blasted treatment drastically distorted the coherent γ/γ′ microstructure of substrates, which accordingly promoted the uniform and accelerated precipitation of topologically close-packed (TCP) phases by the post heat treatment at 1273 K for 30 min. On the other hand, specimens without the grit-blast treatment had less amount of TCP precipitates, but showed preferred precipitation orientation along 〈011〉{100} direction. Surface preheating and surface sputter cleaning seemed to have less influences on microstructure change compared to the grit-blast treatment.

Original languageEnglish
Pages (from-to)1665-1670
Number of pages6
JournalMaterials Transactions
Volume47
Issue number7
DOIs
Publication statusPublished - 2006 Jul 1
Externally publishedYes

Fingerprint

grit
plasma spraying
Plasma spraying
heat resistant alloys
Superalloys
low pressure
Single crystals
blasts
microstructure
Microstructure
single crystals
Substrates
Coated materials
Coatings
Preheating
gas turbines
surface treatment
operating temperature
deterioration
Powders

Keywords

  • Grit blasting
  • Orientation dependence
  • Orientation imaging microscopy (OIM)
  • Phase transformation
  • Topologically close packed (TCP) phase

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

Microstructural investigation of CoNiCrAlY coated Ni-based single crystal superalloy prepared by LPPS. / Sakai, Takashi; Shibata, Mitsuhiro; Murakami, Hideyuki; Kuroda, Seiji.

In: Materials Transactions, Vol. 47, No. 7, 01.07.2006, p. 1665-1670.

Research output: Contribution to journalArticle

Sakai, Takashi ; Shibata, Mitsuhiro ; Murakami, Hideyuki ; Kuroda, Seiji. / Microstructural investigation of CoNiCrAlY coated Ni-based single crystal superalloy prepared by LPPS. In: Materials Transactions. 2006 ; Vol. 47, No. 7. pp. 1665-1670.
@article{53937908b29247c2bdbbeeb004c523bc,
title = "Microstructural investigation of CoNiCrAlY coated Ni-based single crystal superalloy prepared by LPPS",
abstract = "Recent demand in increasing the efficiency of gas turbines has led the component materials to be exposed at much higher operating temperatures, which accordingly accelerates the microstructural deterioration of the coated materials, mainly caused by the interaction between the coated layer and the substrate. Therefore, controlling the chemistry of interfaces by the coating process is one of the most important keys to minimizing the microstructural changes during service. In this study, effects of surface treatments and coating conditions on microstructure changes of Ni-based superalloy substrates were investigated. CoNiCrAlY (AMDRY 9954) powder was coated on Ni-based single crystal superalloy TMS-82+ by low pressure plasma spraying (LPPS). It was found that grit-blasted treatment drastically distorted the coherent γ/γ′ microstructure of substrates, which accordingly promoted the uniform and accelerated precipitation of topologically close-packed (TCP) phases by the post heat treatment at 1273 K for 30 min. On the other hand, specimens without the grit-blast treatment had less amount of TCP precipitates, but showed preferred precipitation orientation along 〈011〉{100} direction. Surface preheating and surface sputter cleaning seemed to have less influences on microstructure change compared to the grit-blast treatment.",
keywords = "Grit blasting, Orientation dependence, Orientation imaging microscopy (OIM), Phase transformation, Topologically close packed (TCP) phase",
author = "Takashi Sakai and Mitsuhiro Shibata and Hideyuki Murakami and Seiji Kuroda",
year = "2006",
month = "7",
day = "1",
doi = "10.2320/matertrans.47.1665",
language = "English",
volume = "47",
pages = "1665--1670",
journal = "Materials Transactions",
issn = "1345-9678",
publisher = "Japan Institute of Metals (JIM)",
number = "7",

}

TY - JOUR

T1 - Microstructural investigation of CoNiCrAlY coated Ni-based single crystal superalloy prepared by LPPS

AU - Sakai, Takashi

AU - Shibata, Mitsuhiro

AU - Murakami, Hideyuki

AU - Kuroda, Seiji

PY - 2006/7/1

Y1 - 2006/7/1

N2 - Recent demand in increasing the efficiency of gas turbines has led the component materials to be exposed at much higher operating temperatures, which accordingly accelerates the microstructural deterioration of the coated materials, mainly caused by the interaction between the coated layer and the substrate. Therefore, controlling the chemistry of interfaces by the coating process is one of the most important keys to minimizing the microstructural changes during service. In this study, effects of surface treatments and coating conditions on microstructure changes of Ni-based superalloy substrates were investigated. CoNiCrAlY (AMDRY 9954) powder was coated on Ni-based single crystal superalloy TMS-82+ by low pressure plasma spraying (LPPS). It was found that grit-blasted treatment drastically distorted the coherent γ/γ′ microstructure of substrates, which accordingly promoted the uniform and accelerated precipitation of topologically close-packed (TCP) phases by the post heat treatment at 1273 K for 30 min. On the other hand, specimens without the grit-blast treatment had less amount of TCP precipitates, but showed preferred precipitation orientation along 〈011〉{100} direction. Surface preheating and surface sputter cleaning seemed to have less influences on microstructure change compared to the grit-blast treatment.

AB - Recent demand in increasing the efficiency of gas turbines has led the component materials to be exposed at much higher operating temperatures, which accordingly accelerates the microstructural deterioration of the coated materials, mainly caused by the interaction between the coated layer and the substrate. Therefore, controlling the chemistry of interfaces by the coating process is one of the most important keys to minimizing the microstructural changes during service. In this study, effects of surface treatments and coating conditions on microstructure changes of Ni-based superalloy substrates were investigated. CoNiCrAlY (AMDRY 9954) powder was coated on Ni-based single crystal superalloy TMS-82+ by low pressure plasma spraying (LPPS). It was found that grit-blasted treatment drastically distorted the coherent γ/γ′ microstructure of substrates, which accordingly promoted the uniform and accelerated precipitation of topologically close-packed (TCP) phases by the post heat treatment at 1273 K for 30 min. On the other hand, specimens without the grit-blast treatment had less amount of TCP precipitates, but showed preferred precipitation orientation along 〈011〉{100} direction. Surface preheating and surface sputter cleaning seemed to have less influences on microstructure change compared to the grit-blast treatment.

KW - Grit blasting

KW - Orientation dependence

KW - Orientation imaging microscopy (OIM)

KW - Phase transformation

KW - Topologically close packed (TCP) phase

UR - http://www.scopus.com/inward/record.url?scp=33748577695&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33748577695&partnerID=8YFLogxK

U2 - 10.2320/matertrans.47.1665

DO - 10.2320/matertrans.47.1665

M3 - Article

AN - SCOPUS:33748577695

VL - 47

SP - 1665

EP - 1670

JO - Materials Transactions

JF - Materials Transactions

SN - 1345-9678

IS - 7

ER -