2024-03-29T05:52:12Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/757522022-11-17T02:08:08Zhdl_2115_20045hdl_2115_139過包晶炭素鋼の包晶変態とオーステナイト結晶粒形成Peritectic Transformation and Austenite Grain Formation for Hyper-peritectic Carbon Steel丸山, 徹松浦, 清隆工藤, 昌行伊藤, 洋一dendrite arm spacingdirectional solidificationgrain growthperitectic reactionphase transformationsegregation560Three binds of solidifying regions, (L+δ), (L+δ+γ) and (L+γ) have been observed in an unidirectional solidified hyper-peritectic steel sample quenched from a temperature above the solidus temperature. The primary δ phase in the (L+δ) region solidifies to a dendritic structure, and the fine columnar γ grains are exist in the boundary part of the (L+γ) region near to the (L+δ+γ). The columnar shape of the fine γ grains is caused by the shape of δ-dendrite. A transition from the fine γ grains to coarse columnar γ grains occurs in the (L+γ) region when a volume fraction of liquid lowers. The structure of coarse columnar γ grain have no relation with dendrite structure. The fine columnar γ grains disappear as a result of growth of coarse columnar γ grain. The measured temperature ranges for the (L+δ+γ) region agree with those calculated under a non-equilibrium condition. The end temperatures of peritectic reaction and solidification calculated are somewhat lower than the equilibrium temperatures, and are independent of solidification rate.日本鉄鋼協会Journal Articleapplication/pdfhttp://hdl.handle.net/2115/75752https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/75752/1/Tetsu-to-Hagane%2085%288%29_585.pdf0021-15751883-2954AN00151251鉄と鋼8585855911999-08-01jpninfo:doi/10.2355/tetsutohagane1955.85.8_585著作権は日本鉄鋼協会にあるpublisher