Effect of state of carbon on fatigue properties and dislocation structure of Fe-0.017mass%C alloy

Nobuyuki Yoshimura, Kohsaku Ushioda, Yuichi Yoshida, Eisaku Sakurada, Mitsuharu Yonemura, Motomichi Koyama, Hiroshi Noguchi, Chihiro Watanabe

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Carbon plays an important role in controlling the mechanical properties of steels. In this study, the effect of different states of carbon―solute carbon, fine transgranular cementite, or coarse intergranular cementite―on the fatigue properties of Fe-0.017mass%C alloy was investigated. Transmission electron microscopy was used to examine the dislocation structure. Rigorous X-ray line profile analysis was conducted to evaluate the change in dislocation density, dislocation arrangement, and dislocation character as a function of the state of carbon. The fatigue limit ratio (fatigue strength/ultimate tensile strength) under the constant stress amplitude conditions was the highest for the solute carbon specimen, followed by the transgranular cementite and intergranular cementite specimens. The solute carbon specimen exhibited a prominent vein dislocation structure, whereas the transgranular cementite and intergranular cementite specimens showed tangled and cellular dislocation structures, respectively. X-ray line profile analysis revealed that the vein structure presumably consisted of a bunch of edge dislocations, whereas the cell structure mostly consisted of screw dislocations. The fractured surface of the solute carbon specimen showed large asperity and no clear striations, whereas the transgranular and intergranular cementite specimens revealed clear striations. Moreover, large cracks were observed along the striations, presumably owing to the existence of cementite.

Original languageEnglish
Pages (from-to)212-219
Number of pages8
JournalMaterials Science and Engineering A
Volume732
DOIs
Publication statusPublished - Aug 8 2018

Fingerprint

cementite
Carbon
Fatigue of materials
carbon
striation
solutes
veins
X rays
Edge dislocations
Screw dislocations
Steel
screw dislocations
edge dislocations
profiles
tensile strength
Tensile strength
x rays
Transmission electron microscopy
Cracks
cracks

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Yoshimura, N., Ushioda, K., Yoshida, Y., Sakurada, E., Yonemura, M., Koyama, M., ... Watanabe, C. (2018). Effect of state of carbon on fatigue properties and dislocation structure of Fe-0.017mass%C alloy. Materials Science and Engineering A, 732, 212-219. https://doi.org/10.1016/j.msea.2018.06.082

Effect of state of carbon on fatigue properties and dislocation structure of Fe-0.017mass%C alloy. / Yoshimura, Nobuyuki; Ushioda, Kohsaku; Yoshida, Yuichi; Sakurada, Eisaku; Yonemura, Mitsuharu; Koyama, Motomichi; Noguchi, Hiroshi; Watanabe, Chihiro.

In: Materials Science and Engineering A, Vol. 732, 08.08.2018, p. 212-219.

Research output: Contribution to journalArticle

Yoshimura, Nobuyuki ; Ushioda, Kohsaku ; Yoshida, Yuichi ; Sakurada, Eisaku ; Yonemura, Mitsuharu ; Koyama, Motomichi ; Noguchi, Hiroshi ; Watanabe, Chihiro. / Effect of state of carbon on fatigue properties and dislocation structure of Fe-0.017mass%C alloy. In: Materials Science and Engineering A. 2018 ; Vol. 732. pp. 212-219.
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