Effects of V or Cu Addition on High-Temperature Tensile Properties of High-Ni-Containing Austenitic Cast Steels Used for High-Performance Turbo-Charger Housings

Jisung Yoo, Won Mi Choi, Seok S Sohn, Byeong Joo Lee, Gi Yong Kim, Hyungjun Kim, Won Doo Choi, Yong Jun Oh, Sunghak Lee

Research output: Contribution to journalArticle

Abstract

For maintaining high-performance turbo-charger housings at higher exhaust-gas temperatures, e.g., 1050 °C, a high-Ni(20 wt%)-containing austenitic steel (ASTM HK40 steel) has been actively modified. As a promising method, the solid-solution hardening obtained from the V or Cu addition was utilized in this study. Five austenitic cast steels were made by adding V or Cu in the modified HK40 steel (N16 steel; 4%-Ni replacement by 4.6%-Mn), and the high-temperature property improvement was explained by detailed microstructural evolutions coupled with thermodynamically calculated phase diagrams. The V- or Cu-added steels showed improvements in high-temperature properties over the N16 steel because the addition of V or Cu raised both austenite matrix hardness and volume fraction of M 7 C 3 carbide. Considering that only 3.6–4.8 vol% of M 7 C 3 was present in the five austenitic cast steels, the strengths were affected more by the matrix hardness. When the V or Cu content was quite high, however, the ferrite or Cu-coring is formed, thereby leading to the serious deterioration of high-temperature properties. The V- or Cu-added steels within proper contents are applicable well to automotive turbo-charger housings requiring or emphasizing high-temperature tensile properties.

Original languageEnglish
Pages (from-to)285-294
Number of pages10
JournalMetals and Materials International
Volume25
Issue number2
DOIs
Publication statusPublished - 2019 Mar 8
Externally publishedYes

Fingerprint

Steel
tensile properties
Tensile properties
casts
steels
High temperature properties
Temperature
Hardness
hardness
Austenitic steel
Microstructural evolution
exhaust gases
Exhaust gases
Austenite
matrices
gas temperature
austenite
Phase diagrams
Ferrite
Carbides

Keywords

  • Cu-coring
  • High-Ni-containing austenitic cast steel
  • M C carbide
  • Turbo-charger housing
  • V or Cu addition

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Effects of V or Cu Addition on High-Temperature Tensile Properties of High-Ni-Containing Austenitic Cast Steels Used for High-Performance Turbo-Charger Housings. / Yoo, Jisung; Choi, Won Mi; Sohn, Seok S; Lee, Byeong Joo; Kim, Gi Yong; Kim, Hyungjun; Choi, Won Doo; Oh, Yong Jun; Lee, Sunghak.

In: Metals and Materials International, Vol. 25, No. 2, 08.03.2019, p. 285-294.

Research output: Contribution to journalArticle

Yoo, Jisung ; Choi, Won Mi ; Sohn, Seok S ; Lee, Byeong Joo ; Kim, Gi Yong ; Kim, Hyungjun ; Choi, Won Doo ; Oh, Yong Jun ; Lee, Sunghak. / Effects of V or Cu Addition on High-Temperature Tensile Properties of High-Ni-Containing Austenitic Cast Steels Used for High-Performance Turbo-Charger Housings. In: Metals and Materials International. 2019 ; Vol. 25, No. 2. pp. 285-294.
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