Estimation of phase transformation behavior and high temperature properties in SUS410 using visualization techniques

Fukumoto, Shigeo; Iwasaki, Yuuji; Hojo, Masatake; Inoue, Hiroshige

doi:10.2207/qjjws.31.201

Cited by 1 publication

(1 citation statement)

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“…The specimens were then set in an alumina crucible with an inner diameter of 8 mm and a height of 3.5 mm. In-situ observations 8) were conducted using a confocal scanning laser microscope (Yonekura Manufacturing Co., Ltd.) combined with an infrared image furnace. The atmosphere in the furnace was ultra-high-purity Ar ( > 99.9999 vol%).…”

Section: In-situ Observation During Heat Treatmentmentioning

confidence: 99%

High-temperature Embrittlement in Si-added Austenitic Stainless Steel

Iwasaki

Fukumoto

2020

ISIJ Int.

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High-temperature tensile tests, a cast-slab microstructure investigation, and an in-situ observation of the dissolution behavior of 17%Cr-14%Ni-4%Si-Nb steel during heat treatment were conducted. The ductility suddenly decreased at above 1 200°C. A microstructure observation near the cast-slab surface suggests that the solidification mode was a divorced eutectic ferrite-austenite; in addition, the precipitation of Fe 16 Nb 6 Si 7 (G phase) occurred inside the δ phase and at the δ/γ interface. The temperature at which solidification was completed, as calculated using DICTRA, was 1 331°C; hence, the embrittlement at about 1 200°C, observed during the high-temperature tensile tests, was different from the I-zone embrittlement caused by the residual liquid phase during solidification. The in-situ observations showed that liquefaction occurred from the δ phase near the δ/γ interface at above 1 180°C. The high-temperature embrittlement was attributed to compositional liquefaction, in which the G phase was precipitated inside the δ phase and at the δ/γ interface during the cooling process after solidification provided Si and Ni owing to the dissolution upon reheating .

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Section: In-situ Observation During Heat Treatmentmentioning

confidence: 99%