Formation of nanosized martensite particles in stainless steels

M. Shimojo; T. Inamura; T. H. Myeong; K. Takashima; Y. Higo

doi:10.1007/s11661-001-0257-9

Formation of nanosized martensite particles in stainless steels

M. Shimojo, T. Inamura, T. H. Myeong, K. Takashima, Y. Higo

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

Martensitic transformations occur in steels and other metals when the material is quenched or cooled. During the transformation, a metastable phase transforms in an autocatalytic way into a thermodynamically stable phase. Thus, it has been considered to be impossible to control the size of martensite in the order of nanometers. Here, we report the formation and dispersion of nanosized martensite in stainless steels by controlling the dislocation density and temperature. Electron microscopy revealed that martensite particles of approximately 5 nm in diameter were dispersed. Since both work hardening and precipitation hardening are effective in this material, this would be an additional, newly discovered strengthening mechanism for steels.

Original language	English
Pages (from-to)	261-265
Number of pages	5
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	32
Issue number	2
DOIs	https://doi.org/10.1007/s11661-001-0257-9
Publication status	Published - 2001 Feb
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys

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AU - Inamura, T.

AU - Myeong, T. H.

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AU - Higo, Y.

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AB - Martensitic transformations occur in steels and other metals when the material is quenched or cooled. During the transformation, a metastable phase transforms in an autocatalytic way into a thermodynamically stable phase. Thus, it has been considered to be impossible to control the size of martensite in the order of nanometers. Here, we report the formation and dispersion of nanosized martensite in stainless steels by controlling the dislocation density and temperature. Electron microscopy revealed that martensite particles of approximately 5 nm in diameter were dispersed. Since both work hardening and precipitation hardening are effective in this material, this would be an additional, newly discovered strengthening mechanism for steels.

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