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Changes in Carburized Microstructures and Creep Properties of Nb-Added SCH13A Heat-Resistant Cast Steel due to Different Pouring Temperatures

Tetsuya Okuyama, Ngo Huynh Kinh Uuan,Masaki Kudo,Kuniaki Mizuno,Koreaki Koizumi

JOURNAL OF THE JAPAN INSTITUTE OF METALS AND MATERIALS（2023）

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Abstract
The relationship between pouring temperature and carburized microstructure of 1%Nb-added SCH13A heat-resistant cast steel manufactured by the self-hardening mold casting process at pouring temperatures of 1753 K, 1823 K and 1883 K was investigated. The creep the creep properties revealed that the volume of primary carbides and the number of voids and micro-cracks in carbides generated due to than that of the as-cast specimens. Additionally, pouring at 1823 K exhibits the longest rupture time among the samples poured at three different
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Key words
vacuum carburizing quenching, heat - resistant cast steel, primary carbide, creep properties
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