Composite Behavior of Lath Martensite Steels Induced by Plastic Strain, a New Paradigm for the Elastic-Plastic Response of Martensitic Steels

T. Ungár, Stefanus Harjo, Takuro Kawasaki, Yo Tomota, Gábor Ribárik, Zengmin Shi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Based on high-resolution neutron diffraction experiments, we will show that in lath martensite steels, the initially homogeneous dislocation structure, i.e., homogeneous on the length scale of grain size, is disrupted by plastic deformation, which, in turn, produces a composite on the length scale of martensite lath packets. The diffraction patterns of plastically strained martensitic steel reveal characteristically asymmetric peak profiles in the same way as has been observed in materials with heterogeneous dislocation structures. The quasi homogeneous lath structure, formed by quenching, is disrupted by plastic deformation producing a composite structure. Lath packets oriented favorably or unfavorably for dislocation glide become soft or hard. Two lath packet types develop by work softening or work hardening in which the dislocation densities become smaller or larger compared to the initial average dislocation density. The decomposition into soft and hard lath packets is accompanied by load redistribution and the formation of long-range internal stresses between the two lath packet types. The composite behavior of plastically deformed lath martensite opens a new way to understand the elastic-plastic response in this class of materials.

Original languageEnglish
Pages (from-to)159-167
Number of pages9
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume48
Issue number1
DOIs
Publication statusPublished - Jan 1 2017

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Martensitic steel
Steel
martensite
Martensite
Plastic deformation
plastics
steels
Plastics
composite materials
Composite materials
plastic deformation
Neutron diffraction
Composite structures
Strain hardening
work softening
Diffraction patterns
Quenching
Loads (forces)
Residual stresses
work hardening

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

Composite Behavior of Lath Martensite Steels Induced by Plastic Strain, a New Paradigm for the Elastic-Plastic Response of Martensitic Steels. / Ungár, T.; Harjo, Stefanus; Kawasaki, Takuro; Tomota, Yo; Ribárik, Gábor; Shi, Zengmin.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 48, No. 1, 01.01.2017, p. 159-167.

Research output: Contribution to journalArticle

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