Carbide Formation and Matrix Strengthening by Nb Addition in Austenitic Stainless Cast Steels Used for Turbo-Charger-Housing Materials

Jisung Yoo; Won‑Mi Choi; Byeong‑Joo Lee; Gi‑Yong Kim; Hyungjun Kim; Won‑Doo Choi; Yong‑Jun Oh; Sunghak Lee

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자료유형: 학술저널

저자정보: Jisung Yoo (Pohang University of Science and Technology) Won‑Mi Choi (Pohang University of Science and Technology) Byeong‑Joo Lee (Pohang University of Science and Technology) Gi‑Yong Kim (Key Yang Precision) Hyungjun Kim (Key Yang Precision) Won‑Doo Choi (Hanbat National University) Yong‑Jun Oh (Hanbat National University) Sunghak Lee (Pohang University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.10

발행연도: 2020.1

수록면: 1,506 - 1,514 (9page)

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In order to increase the exhaust-gas temperature of austenitic stainless cast steels used for turbo-charger-housings up to1050 °C, the more excellent high-temperature strength should be obtained because it works for keeping a sustainability ofthe housing shape. Three austenitic stainless cast steels were fabricated in this study by adding Nb into the Ni/Mn-replacedconventional ASTM HK40 steel, and their high-temperature strength was investigated in relation with the carbide formationand matrix strengthening. The 1-wt%-Nb-added steel showed the enhancement in high-temperature strength over thenon-Nb-added steel. This indicated that the Nb addition was effective on the strength improvement because it raised boththe fraction of thermally-stable hard MC-type carbides and the austenite-matrix hardness. However, the 1.5-wt%-Nb-addedsteel showed the lower high-temperature strength than the 1-wt%-Nb-added steel, although it contained the more MC carbides. The more MC carbides reduced the matrix hardness, enlarged the hardness difference between carbides and matrix,and deteriorated the high-temperature strength. Our results demonstrate that the strengthened matrix as well as populatedcarbides due to the Nb addition are desirable for further improving the high-temperature strength.

#Turbo-charger housing · Austenitic stainless cast steel · Nb addition · MC carbide · Matrix strengthening · Hightemperature tensile strength

참고문헌 (27)

참고문헌 신청

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Y. -J. Kim / 2009 / Mater. Sci. Eng. A 526:244

G. D. de Almeida Soares / 1991 / Mater. Charact 26:1

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B. Piekarski / 2001 / Mater. Charact 47:181

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