Development of severe torsion straining process for rapid continuous grain refinement

Katsuaki Nakamura, Koji Neishi, Kenji Kaneko, Michihiko Nakagaki, Zenji Horita

    Research output: Contribution to journalArticlepeer-review

    51 Citations (Scopus)


    This study presents a rapid continuous process for grain refinement in metallic materials through severe plastic deformation (SPD). The principle is described and the process is applied to an Al-5056 alloy and an S45C carbon steel. The new process, designated in this study the severe torsion straining process (STSP), consists of producing a local heated zone in a rod and introducing torsion strain into the zone by rotating one end with the other. The process is continuous because the straining is achieved while the rod is moved so that the heated zone is shifted along the rod. The STSP does not require the use of any die and can be applicable to pipes or wires. Fine-grained structures produced with the STSP are confirmed using optical microscopy and transmission electron microscopy. Tensile properties are measured and compared with the unstrained fully annealed samples. The feasibility of the STSP is discussed with respect to the rotation speed and moving speed.

    Original languageEnglish
    Pages (from-to)3338-3342
    Number of pages5
    JournalMaterials Transactions
    Issue number12
    Publication statusPublished - Dec 2004

    All Science Journal Classification (ASJC) codes

    • General Materials Science
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering


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