Optical microscopy-Based damage quantification

an example of cryogenic deformation of a dual-Phase steel

Nao Uehata, Motomichi Koyama, Shusaku Takagi, Kaneaki Tsuzaki

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We evaluated the availability of an optical-microscopy-based damage quantification method in a ferrite/ martensite dual-phase steel, and interpreted the obtained results toward screening damage evolution behavior under various test conditions. In this study, we employed this method for tensile deformation at 20, −100, and −180°C to analyze the temperature dependence of damage evolution in cryogenic regime as a case study. The damage evolution behavior was classified into regimes of damage nucleation, damage arrest, and damage growth to fracture, irrespective of the deformation temperature in a cryogenic temperature range. Coupled with some high-resolution observations, the damage nucleation and damage arrest sites were identified to be martensite and ferrite, which are common regardless of the deformation temperatures. This indicates that ferrite acted as a damage arrest site even at −180°C. However, a critical strain for damage growth to fracture decreased drastically by decreasing the temperature to −180°C. The distinct reduction in the critical strain is attributed to the transition of ferrite cracking mode from ductile to brittle mechanisms.

Original languageEnglish
Pages (from-to)179-185
Number of pages7
JournalISIJ International
Volume58
Issue number1
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

Steel
Cryogenics
Optical microscopy
Ferrite
Martensite
Nucleation
Temperature
Screening
Availability

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Optical microscopy-Based damage quantification : an example of cryogenic deformation of a dual-Phase steel. / Uehata, Nao; Koyama, Motomichi; Takagi, Shusaku; Tsuzaki, Kaneaki.

In: ISIJ International, Vol. 58, No. 1, 01.01.2018, p. 179-185.

Research output: Contribution to journalArticle

Uehata, Nao ; Koyama, Motomichi ; Takagi, Shusaku ; Tsuzaki, Kaneaki. / Optical microscopy-Based damage quantification : an example of cryogenic deformation of a dual-Phase steel. In: ISIJ International. 2018 ; Vol. 58, No. 1. pp. 179-185.
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