A research institute specializing in Materials Science

Advanced Metals Division

Department of High Temperature Materials

Head of Department
Choi, Baig-gyu

Department Introduction

Department of High Temperature Materials is performing alloy development, process optimization, test and evaluation of property, and failure analysis research on structural alloys applied to high temperature service. Major research materials of the center are superalloys, which are mainly applied to industrial gas turbine, power generation steam turbine, aerospace engine, and defence facilities. The efficiency of the advanced energy plant area such as nuclear plant, hydrogen plant is greatly dependent on the key technologies related to superalloys whose application is continuously expanding.

+82-55-280-3321

Major Activities

Re reduction single crystal superalloy and thermal barrier coating related domestic and international patent applications 4 cases, patent registration 1 case, 4 articles publication
Development of superalloys for energy plant application : 1 patent applied, 1 patent registered, 2 papers published
A symposium on materials for future power generation and superalloys (10/25, Daegu convention center)
Gas turbine cluster materials/manufacturing workshop (5/17, CECO, Changwon)

Major Research Area

Development of rare element abatement single crystal superalloy
Development of high efficient superalloys for energy plant application
Development of 3D printing technology for Ni-base superalloys
Single crystal superalloy development for J-class gas turbines

Future Research Plan

  • Development of Re-free single crystal superalloy
  • High temperature mechanical testing and materials DB construction for gas turbines
  • Development of 3D printing and post heat treatment technologies for Ni-base superalloys
  • Superalloys for energy plant : Development of key technologies for commercialization

Major R&D Activities

Development of multi-performance single crystal superalloys and advanced thermal barrier coating technology for gas turbine applications

  • Developed single-crystal super-heat-resistant alloy with excellent creep and fatigue properties comparable to commercial 3% Re alloy while reducing Re to 1.5%.
  • Even after long-term exposure at high temperature, TCP phase formation was lower than that of commercial alloy, and thermal stability was also excellent.
  • The interfacial compatibility between the developed single crystal alloy and the commercial bond coating was better than that of the commercial alloy due to the narrower interfacial reaction layer thickness.
Comparison of creep properties between commercial alloy CMSX-4 and the developed alloys
γ/γ′ microstructure of the developed alloy after creep test

Development of a wrought nickel base superalloy for high efficiency energy plant

  • Development of a nickel base new alloy showing excellent combination of cyclic oxidation/steam oxidation resistances and creep properties.
  • The creep life of the developed alloy is 2,644 hr. at 760℃/283MPa, which is better than 1,000hr. of the commercial Haynes 282 alloy.
  • The new alloy can be used for 760℃ A-USC steam turbine.
  • The developed alloy has a good formability at temperatures higher than 1130℃ with a strain rate over 1/s.
Comparison of cyclic/steam oxidation resistances and creep properties of the developed alloy for high efficient energy plant applications

Superalloy development for hot parts of 1600℃ class gas turbines

  • Development of single crystal superalloys for hot parts of 1600℃ J-class gas turbines for future domestic high efficiency power generation. The final goal is to attain temperature capability of 1100℃ and superior oxidation resistance to CMSX-4.
  • Computational alloy design utilizing artificial intelligence approach (response surface method and neural network)
  • 1100℃/137MPa creep life longer than standard developed alloy by 167%
  • 950℃ low cycle fatigue life longer than target alloy by 175%
Creep curve for 1100℃ creep tests
950 oC low cycle fatigue property