Analysis of mechanical property distribution in multiphase ultra-fine-grained steels by nanoindentation

The strength characteristics of microphases in ultra-fine-grained steels were analyzed using nanoindentation and AFM. It was found that there were fine ferrite grains ( 1–2 μ m) formed by a strain-induced dynamic transformation in ultra-fine-grained steels. They had equiaxed and polygonal grain shap...

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Veröffentlicht in:	Scripta materialia 2001-12, Vol.45 (12), p.1401-1406
Hauptverfasser:	Choi, Yeol, Yong Choo, Wung, Kwon, Dongil
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Cross-disciplinary physics: materials science rheology Deformation, plasticity, and creep Exact sciences and technology Hardness Materials science Metals. Metallurgy Nanoindentation Physics Strain-induced dynamic transformation ferrite Treatment of materials and its effects on microstructure and properties Ultra-fine-grained steels
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Beschreibung
Zusammenfassung:	The strength characteristics of microphases in ultra-fine-grained steels were analyzed using nanoindentation and AFM. It was found that there were fine ferrite grains ( 1–2 μ m) formed by a strain-induced dynamic transformation in ultra-fine-grained steels. They had equiaxed and polygonal grain shape, and higher hardness and elastic modulus than coarse ferrite transformed statically. Strengthening factors of strain-induced dynamic transformation ferrite were analyzed in terms of cementite particles and dislocation density.
ISSN:	1359-6462 1872-8456
DOI:	10.1016/S1359-6462(01)01176-9