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논문 기본 정보

자료유형
학술저널
저자정보
Jeom Yong Choi (Pohang STS Co. Ltd.) Kyung‑Tae Park (Hanbat National University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.9
발행연도
2021.9
수록면
3,105 - 3,114 (10page)
DOI
10.1007/s12540-020-00689-7

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초록· 키워드

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Precipitation and related phase transformation during aging of a hot-rolled Mo-free lean duplex stainless steel (DSS) wereinvestigated. This steel belongs to a class of newly developed TRIP-aided lean DSS. The hot-rolled plate of the present DSSwas solutionized at 1100 °C for 5 min, aged in the temperature range of 600?1000 °C for up to 2 h and then water-quenched. The microstructure of the aged DSS was analyzed by electron backscattered diffraction, (scanning-)transmission electronmicroscopy, and electron probe micro analysis. The Cr2Nrapidly precipitated at the δ-ferrite/γ-austenite phase boundaryand δ grain interior and boundary, but precipitation of the σ phase and carbides was suppressed due to the absence of Mo. A zone of Cr and N depletion related to Cr2Nprecipitation formed on the primary austenite side rather than on the δ-ferriteside, resulting in formation of secondary austenite by consuming the primary austenite as aging proceeded. The secondaryaustenite formation of the present DSS is in contrast to that of conventional Mo-bearing DSS in which the σ phase and secondaryaustenite precipitate on the δ ferrite side. The fractions of Cr2Nand secondary austenite continuously increased duringup to 2 h aging without σ phase precipitation. The similarities and differences of microstructural evolution of the presentTRIP-aided lean DSS and conventional DSS during aging were addressed. The effects of such microstructural evolution onthe room temperature tensile properties of the present DSS were also discussed.

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