Hai QUI

Senior Researcher
Metallurgical Processing Group

--------------------------------------------------------------------------------

Research Topics

Fracture mechanics/ Welding mechanics/ Safety evaluation of welded structure

List of Articles

Paper in Journal

  1. M. Zhao, T. Hanamura, H. Qiu, K. Nagai and K. Yang, Grain growth and Hall-Petch relaion in dual-sized ferrite/cementite stel with nano-sized cementite particles in a heterogeneous and dense distribution, Scripta Materialia, 54, 6 (2006) pp1193-1197

  2. M. Zhao, T. Hanamura, H. Qiu, K. Nagai and K. Yang, Dependence of strength-elongation balance on the volumen fraction of cementite particles in ultrafine grained ferrite/cementite steels, Scripta Materialia, 54, 7 (2006) pp1385-1389
  3. Ming-Chun Zhao, Toshihiro Hanamura, Hai Qiu, Kotobu Nagai, Y.-Y. Shan and Ke Yang: Difference in the role of non-quench aging on mechanical properties between acicular ferrite and ferrite-pearlite pipeline steelsh, ISIJ International, Vol. 45, 2005, pp. 116-120

  4. Ming-Chun Zhao, Toshihiro Hanamura, Hai Qiu, and Ke Yang: Lath boundary thin-film martensite in acicular ferrite ultralow carbon pipeline steels, Mater. Sci. Eng. A, Vol. 395, 2005, pp. 327-332

  5. Ming-Chun Zhao, Toshihiro Hanamura, Hai Qiu, and Ke Yang: Precipitation of carbonitrides and their strengthening upon non-quench aging for micro-alloyed acicular ferrite pipeline steelsh, Mater. Trans., Vol. 46, No. 4, 2005, pp.784-789

    1. Hai Qiu, Yoshiaki Kawaguchi, Chiaki Shiga: Fracture behavior of ultra-fine grained steel bar under dynamic loading, Journal of Materials Science, Vol. 39, No. 11, 2004, pp.3733-3737.

    2. Hai Qiu, Yoshiaki Kawaguchi, Chiaki Shiga, Manabu Enoki and Teruo Kishi: A high-strength and low-yield-ratio carbon steel bar processed by thermo-mechanical rolling, Materials Science and Technology, Vol. 20, No.9, 2004, pp.1158-1160.

    3. Hai Qiu, Akio Ohmori, Yukito Hagiwara: Mechanical properties of welded joints of 780MPa grade ultra-fine grained steels, ISIJ International, Vol. 43, No. 12, 2003, pp. 2046-2053.

    4. Hai Qiu, Yoshiaki Kawaguchi, Manabu Enoki, Teruo Kishi: Effect of welding thermal cycles and cold working on the fracture toughness of SN490 steel under static and dynamic loading, Materials Science and Technology, Vol. 19, No. 8, 2003, pp. 1045-1049.

    5. Hai Qiu, Yoshiaki Kawaguchi: Strength and deformability of welded joints of 780MPa grade steel plates, Materials Science and Engineering A, Vol. 348, No. 1-2, 2003, pp. 22-28.

    6. Hai Qiu, Manabu Enoki, Teruo Kishi: A model for the dynamic fracture toughness of ductile structural steel, Engineering Fracture Mechanics, Vol. 70, No. 5, 2003, pp. 589-598.

    7. Hai Qiu, Manabu Enoki, Teruo Kishi: A model for the static fracture toughness of ductile structural steel, Engineering Fracture Mechanics, Vol. 70, No. 5, 2003, pp. 599-609.

    8. Hai Qiu, Hisashi Mori, Manabu Enoki, Teruo Kishi: Effect of welding thermal cycle and cold working on the ductility of structural steel under high-speed loading, Materials Science and Engineering A, Vol. A 316, 2001, pp. 217-223.

    9. Hai Qiu, Manabu Enoki, Hisashi Mori, Teruo Kishi: Fracture mechanism and toughness of the welding heat-affected zone in structural steel under static and dynamic loading, Metallurgical and Materials Transactions A, Vol. 31A, No. 11, 2000, pp. 2785-91.

    10. Hai Qiu, Manabu Enoki, Yoshiaki Kawaguchi, Teruo Kishi: Evaluation of dynamic fracture toughness of welding heat-affected zone of structural steel, ISIJ International, Vol. 40 Supplement, 2000, pp. S34-S38.

    11. Hai Qiu, Manabu Enoki, Hisashi Mori, Nobuo Takeda, Teruo Kishi: Effect of strain rate and plastic pre-stain on the ductility of structural steels, ISIJ International, Vol. 39, No. 9, 1999, pp. 955-60.

    12. Hai Qiu, Hisashi Mori, Manabu Enoki, Teruo Kishi: Evaluation of ductile fracture of structural steels by microvoid model, ISIJ International, Vol. 39, No. 4, 1999, pp. 358-64.

    13. Hai Qiu, Hisashi Mori, Manabu Enoki, Teruo Kishi: Development of a three-dimensional model for ductile fracture in materials containing two types of microvoids, ISIJ International, Vol. 39, No. 4, 1999, pp. 352-57.

    14. Hai Qiu, Guangduo Li: Influence of residual stress on the fatigue crack propagation behavior in near-threshold regime for welding joints of 09CuPCrNi, Journal of Dalian Institute of Railway Technology, Vol. 13, No. 4, 1992, pp. 61-67.*Chinese

    15. Hai Qiu, Guangduo Li: Influence of stress ratio R on threshold value ƒĒKth of fatigue crack propagation for welded joints of 09CuPCrNi, Journal of Welding, Vol. 14, No. 1, 1993, pp. 24-29.*Chinese

    16. Guangduo Li, Zhongli Liu, Hai Qiu: A study of fatigue crack propagation law for welded joints of 15MnVNq, Journal of the China Railway Society, Vol. 15, No. 4, 1993, pp. 115-20. *Chinese

    17. Guangduo Li, Hai Qiu, Kenian Li: A distribution of residual stresses in T weld and its vibration stress-relief, Journal of Dalian Institute of Railway Technology, Vol. 12, No. 2, 1991, pp. 66-70. *Chinese

    18. Hai Qiu, Manabu Enoki, Kazuo Hiraoka, Teruo Kishi: Effect of pre-strain on fracture toughness of ductile structural steels under static and dynamic loading, submitted to Engineering Fracture Mechanics.


      Oral Presentation

      1. Hai Qiu, Manabu Enoki, Teruo Kishi: Dynamic fracture toughness of low carbon steel, Pro. 5th Japan International SAMPE Symposium, Oct. 28-31, 1997, Tokyo, Japan.

      2. Hai Qiu, Manabu Enoki, Teruo Kishi: Ductility of low carbon steel used in architecture, Student Poster Session of the 135th ISIJ Meeting April, 1998, Tokyo, Japan.

      3. Hai Qiu, Manubu Enoki, Teruo Kishi: Evaluation of dynamic fracture toughness of welding heat-affected zone of structural steel, The 138th ISIJ Meeting, International Organized Sessions, November 20-22, 1999, Kanazawa, Japan.

      4. Hai Qiu, Manubu Enoki, Teruo Kishi: Development of a fracture toughness model for ductile fracture and evaluation of toughness of low carbon steel, International workshop on the innovative structural materials for infrastructure in 21st century, January 12-13, 2000, Tsukuba, Japan.

      5. Hai Qiu, Manubu Enoki, Teruo Kishi: Development of a fracture toughness model for ductile fracture, 2000 TMS annual meeting, Poster session, March 12-16, 2000, Nashville, Tennessee, USA.

      6. Hai Qiu, Yoshiaki Kawaguchi, Chiaki Shiga: Mechanical properties of the welded joints of ultra-fine grained steels, Fifth workshop on the ultra-steel, January 17-18, 2001, Tsukuba, Japan.

      7. Hai Qiu, Yoshiaki Kawaguchi: Mechanical properties of welded joints of ultra-fine grained steels, CAMP-ISIJ Vol. 14 (2001), 1082.

      8. Hai Qiu, Yoshiaki Kawaguchi and Chiaki Shiga: Charpy impact behavior of ultra-fine grained steels, Charpy Centenary Conference, Poitiers 2-5 October 2001, Vol. 1, pp. 275-82.

      9. Hai Qiu, Yoshiaki Kawaguchi: Strength and toughness of welded joints of ultra-fine grained steels, sixth workshop on the ultra-steel, May 21, 2002, Tsukuba, Japan.

      10. Hai Qiu, Yukito Hagiwara, Kazuo Hiraoka: Fracture toughness of ultra-fine grained steel, 7th workshop on the ultra-steel, June 24-25, 2003, Tsukuba, Japan, 362-363.