C clustering and partitioning by static strain aging in cold-rolled 16Cr-5Ni supermartensitic stainless steel. (February 2021)

• Record Type: Journal Article
• Authors: Gwon, Hojun; Kim, Sung-Ho; Jeon, Jong Jin; Kim, Sung-Joon
• Is Part Of: Scripta materialia. Number 192(2021)
• Page Start: 106
• Page End: 110
• Publication Date: 2021-02
• Subjects: Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.10.016
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Static strain aging behavior of cold-rolled 16Cr-5Ni supermartensitic stainless steel was investigated after it had been aged for 30 min at 400°C. In uniaxial tensile tests of 20% cold-rolled specimens, increase of yield strength to ~300 MPa and decrease of strain hardening rate were observed in the aged specimen, compared to the as-rolled specimen. In interrupted tensile tests, delayed martensitic transformation was observed in the aged specimen. Dilatometry analysis detected volume shrinkage during the 30 min holding period at 400°C indicating partitioning of carbon (C) from α' martensite to austenite. The clustering of C in α' martensite was confirmed by impulse internal friction technique with observation of Cottrell atmosphere formation. 3D atom probe tomography analysis revealed partitioning of C atoms into austenite and clustering of C atoms in the α' martensite. The remarkable increase of yield strength was attributed to redistribution of C atoms during the aging treatment. Graphical Abstract: Image, graphical abstract