Microstructure Evolution in Isothermal Heat Treatment of 0Cr32Ni7Mo4NDuplex Stainless Steel

Yu Lai Chen; Hong He; Fei Fang

doi:10.4028/www.scientific.net/MSF.789.314

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HomeMaterials Science ForumMaterials Science Forum Vol. 789Microstructure Evolution in Isothermal Heat...

Microstructure Evolution in Isothermal Heat Treatment of 0Cr32Ni7Mo4NDuplex Stainless Steel

Abstract:

The microstructure evolution of as-cast 0Cr32Ni7Mo4N hyper duplex stainless steel during the isothermal heat treatment in the temperature range of 800°C-1300°Cwas studied in the present investigation. The morphologies and precipitates were observed and determined by using optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The results show that eutectoid decomposition reaction (δ→σ+γ₂) take place in ferrite (δ) phase during isothermal heat treatment in the temperature range of 800°C-1000°C. Sigma (σ) phase and secondary austenite (γ₂) phase coexist as cellular structure. Lamellar Cr₂N precipitates in δ phase mostly when isothermal heat treatment at 800°Cand 850°C, while it only appears in γ phase between 900°C and 1050°C. As the annealing temperature rising, the quantity of σ phase, Cr₂N and γ₂ phase decreases. The volume fraction ratio of ferrite and austenite is stable between 1100°C and 1300°C, and γ → δ transformation is hard to occur.

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Periodical:

Materials Science Forum (Volume 789)

Pages:

314-319

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https://doi.org/10.4028/www.scientific.net/MSF.789.314

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Online since:

April 2014

Authors:

Yu Lai Chen*, Hong He, Fei Fang

Keywords:

Cr₂N, Eutectoid Decomposition, Microstructure Evolution, Sigma Phase, Stainless Steel (SS)

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