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

研究成果: Article

19 引用 (Scopus)

抜粋

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.

元の言語English
ページ(範囲)1288-1295
ページ数8
ジャーナルMaterials Transactions
51
発行部数7
DOI
出版物ステータスPublished - 2010 7 1

    フィンガープリント

ASJC Scopus subject areas

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

これを引用

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