Materials Letters· 2026Q2
Grain-boundary Cr2N precipitation triggers severe impact embrittlement in S32750 super duplex stainless steel
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Short summary
Lamellar Cr2N precipitates along ferrite/ferrite grain boundaries in S32750 super duplex stainless steel, even at low volume fractions (~1.4 vol%), drastically reduce impact energy from 260 J to 97 J after 60 min aging at 650 °C.
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Key points
- Lamellar Cr2N precipitates along ferrite/ferrite grain boundaries in S32750 steel after aging at 650 °C.
- Low volume fraction (~1.4 vol%) of Cr2N caused severe impact embrittlement.
- Impact energy reduced from 260 J to 97 J after 60 min aging at 650 °C.
- Crack propagation occurs preferentially along ferrite/Cr2N interfaces.
- Grain-boundary connectivity and lamellar morphology, not volume fraction alone, dominate embrittlement.
AI-generated from the title and abstract; the full text is not read.
Abstract
Cr 2 N precipitation and its impact on mechanical properties were investigated in S32750 super duplex stainless steel aged at 650–750 °C. Lamellar Cr 2 N rapidly precipitated along ferrite/ferrite grain boundaries after only 5 min at 650 °C and progressively decorated the boundaries during aging. Despite its low volume fraction, grain-boundary Cr 2 N caused severe impact embrittlement with little effect on tensile strength. Notably, only ∼1.4 vol% Cr 2 N reduced the impact energy from 260 to 97 J after aging at 650 °C for 60 min. Fractographic analysis revealed preferential crack propagation along ferrite/Cr 2 N interfaces, promoting intergranular fracture. These results demonstrate that grain-boundary connectivity and lamellar morphology, rather than Cr 2 N volume fraction alone, dominate the impact embrittlement of S32750.
The authors' abstract, as published at the source. Materials Letters, 2026 · DOI ↗
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Field: Metals and Alloys
Metals and AlloysMaterials Science