Four-dimensional annihilation behaviors of micro pores during surface cold working

Hiroyuki Toda, Tomoyasu Yamaguchi, Mitsuru Nakazawa, Yoshimitsu Aoki, Kentaro Uesugi, Yoshio Suzuki, Masakazu Kobayashi

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The aimihilation behavior of micro pores in an aluminum alloy casting during surface cold working was continuously observed using the synchrotron radiation microtomography. To analyze micro pore annihilation behavior, the displacement of artificially dispersed particles was measured and thereby local strain distributions were mapped in high-density. A peening treatment annihilated most of the micro pores with a diameter of over 10 μm in the upper part of the specimen that could initiate fatigue cracks. The annihilation behavior of the micro pores could be understood as a function of effective strain locally accumulated around them, and not as a function of local hydrostatic strain. The effective strain varied significantly, with some large pores remaining where local effective plastic strain was relatively low. The complete annihilation of large pores in the surface layer suggests that the application of sufficiently long surface cold working is effective in improving the high-cycle fatigue properties.

Original languageEnglish
Pages (from-to)1288-1295
Number of pages8
JournalMaterials Transactions
Volume51
Issue number7
DOIs
Publication statusPublished - 2010 Jul

Fingerprint

cold working
Cold working
porosity
Shot peening
Synchrotron radiation
peening
Aluminum alloys
Plastic deformation
Casting
strain distribution
Fatigue of materials
hydrostatics
aluminum alloys
surface layers
synchrotron radiation
plastics
cracks
cycles

Keywords

  • Healing
  • Pore
  • Strain mapping
  • Surface hardening
  • X-ray microtomography

ASJC Scopus subject areas

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

Cite this

Toda, H., Yamaguchi, T., Nakazawa, M., Aoki, Y., Uesugi, K., Suzuki, Y., & Kobayashi, M. (2010). Four-dimensional annihilation behaviors of micro pores during surface cold working. Materials Transactions, 51(7), 1288-1295. https://doi.org/10.2320/matertrans.M2010069

Four-dimensional annihilation behaviors of micro pores during surface cold working. / Toda, Hiroyuki; Yamaguchi, Tomoyasu; Nakazawa, Mitsuru; Aoki, Yoshimitsu; Uesugi, Kentaro; Suzuki, Yoshio; Kobayashi, Masakazu.

In: Materials Transactions, Vol. 51, No. 7, 07.2010, p. 1288-1295.

Research output: Contribution to journalArticle

Toda, H, Yamaguchi, T, Nakazawa, M, Aoki, Y, Uesugi, K, Suzuki, Y & Kobayashi, M 2010, 'Four-dimensional annihilation behaviors of micro pores during surface cold working', Materials Transactions, vol. 51, no. 7, pp. 1288-1295. https://doi.org/10.2320/matertrans.M2010069
Toda, Hiroyuki ; Yamaguchi, Tomoyasu ; Nakazawa, Mitsuru ; Aoki, Yoshimitsu ; Uesugi, Kentaro ; Suzuki, Yoshio ; Kobayashi, Masakazu. / Four-dimensional annihilation behaviors of micro pores during surface cold working. In: Materials Transactions. 2010 ; Vol. 51, No. 7. pp. 1288-1295.
@article{d2fab726d32b4869a6efda5c849f1c6c,
title = "Four-dimensional annihilation behaviors of micro pores during surface cold working",
abstract = "The aimihilation behavior of micro pores in an aluminum alloy casting during surface cold working was continuously observed using the synchrotron radiation microtomography. To analyze micro pore annihilation behavior, the displacement of artificially dispersed particles was measured and thereby local strain distributions were mapped in high-density. A peening treatment annihilated most of the micro pores with a diameter of over 10 μm in the upper part of the specimen that could initiate fatigue cracks. The annihilation behavior of the micro pores could be understood as a function of effective strain locally accumulated around them, and not as a function of local hydrostatic strain. The effective strain varied significantly, with some large pores remaining where local effective plastic strain was relatively low. The complete annihilation of large pores in the surface layer suggests that the application of sufficiently long surface cold working is effective in improving the high-cycle fatigue properties.",
keywords = "Healing, Pore, Strain mapping, Surface hardening, X-ray microtomography",
author = "Hiroyuki Toda and Tomoyasu Yamaguchi and Mitsuru Nakazawa and Yoshimitsu Aoki and Kentaro Uesugi and Yoshio Suzuki and Masakazu Kobayashi",
year = "2010",
month = "7",
doi = "10.2320/matertrans.M2010069",
language = "English",
volume = "51",
pages = "1288--1295",
journal = "Materials Transactions",
issn = "1345-9678",
publisher = "Japan Institute of Metals (JIM)",
number = "7",

}

TY - JOUR

T1 - Four-dimensional annihilation behaviors of micro pores during surface cold working

AU - Toda, Hiroyuki

AU - Yamaguchi, Tomoyasu

AU - Nakazawa, Mitsuru

AU - Aoki, Yoshimitsu

AU - Uesugi, Kentaro

AU - Suzuki, Yoshio

AU - Kobayashi, Masakazu

PY - 2010/7

Y1 - 2010/7

N2 - The aimihilation behavior of micro pores in an aluminum alloy casting during surface cold working was continuously observed using the synchrotron radiation microtomography. To analyze micro pore annihilation behavior, the displacement of artificially dispersed particles was measured and thereby local strain distributions were mapped in high-density. A peening treatment annihilated most of the micro pores with a diameter of over 10 μm in the upper part of the specimen that could initiate fatigue cracks. The annihilation behavior of the micro pores could be understood as a function of effective strain locally accumulated around them, and not as a function of local hydrostatic strain. The effective strain varied significantly, with some large pores remaining where local effective plastic strain was relatively low. The complete annihilation of large pores in the surface layer suggests that the application of sufficiently long surface cold working is effective in improving the high-cycle fatigue properties.

AB - The aimihilation behavior of micro pores in an aluminum alloy casting during surface cold working was continuously observed using the synchrotron radiation microtomography. To analyze micro pore annihilation behavior, the displacement of artificially dispersed particles was measured and thereby local strain distributions were mapped in high-density. A peening treatment annihilated most of the micro pores with a diameter of over 10 μm in the upper part of the specimen that could initiate fatigue cracks. The annihilation behavior of the micro pores could be understood as a function of effective strain locally accumulated around them, and not as a function of local hydrostatic strain. The effective strain varied significantly, with some large pores remaining where local effective plastic strain was relatively low. The complete annihilation of large pores in the surface layer suggests that the application of sufficiently long surface cold working is effective in improving the high-cycle fatigue properties.

KW - Healing

KW - Pore

KW - Strain mapping

KW - Surface hardening

KW - X-ray microtomography

UR - http://www.scopus.com/inward/record.url?scp=77956146005&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77956146005&partnerID=8YFLogxK

U2 - 10.2320/matertrans.M2010069

DO - 10.2320/matertrans.M2010069

M3 - Article

VL - 51

SP - 1288

EP - 1295

JO - Materials Transactions

JF - Materials Transactions

SN - 1345-9678

IS - 7

ER -