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On the non-equilibr...
On the non-equilibrium segregation of Boron in 9-12%Cr steels
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Fedorova, I. (författare)
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Grumsen, F. B. (författare)
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- Liu, Fang (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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visa fler...
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Hald, J. (författare)
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visa färre...
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(creator_code:org_t)
- 2017
- 2017
- Engelska.
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Ingår i: 4th International ECCC Creep & Fracture Conference.
- Relaterad länk:
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https://research.cha...
Abstract
Ämnesord
Stäng
- The addition of only 20-150 ppm of boron to martensitic 9-12%Cr steels has a strong enhancing effect on their creep strength, and boron-added martensitic creep strength enhanced steels have been introduced in power plant constructions. Boron is found to redistribute in the martensitic steels during cooling after normalizing in a non-equilibrium segregation process. In this work we attempt to quantify boron segregation during solution treatment in a martensitic 9%Cr steel containing 108 ppm of boron by atom probe tomography and transmission electron microscopy. The investigated material was a solution treated at 1100C for 1 h and cooled in air. Plate-like boride of Cr2B was found on a prior austenite grain boundary (PAGB). The distribution of B, Cr, Fe, Co, Mo, C and other elements in boride and matrix was quantified. Boron is considered to segregate onto PAGBs by non-equilibrium mechanism.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
Nyckelord
- atom probe tomography
- non-equilibrium segregation
- Martensitic creep resistant steels
- boron
Publikations- och innehållstyp
- kon (ämneskategori)
- ref (ämneskategori)