Spot Welded Tensile Properties in Automobile Ultrahigh Strength TRIP-aided Martensitic Steel Sheet

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  • Nagasaka Akihiko
    Department of Mechanical Engineering, National Institute of Technology (KOSEN), Nagano College
  • Hojo Tomohiko
    Institute for Materials Research, Tohoku University
  • Aoki Katsuya
    Advanced Course of Production and Environment System, National Institute of Technology (KOSEN), Nagano College
  • Koyama Hirofumi
    Department of Mechanical Engineering, National Institute of Technology (KOSEN), Nagano College
  • Shimizu Akihiro
    Department of Mechanical Engineering, National Institute of Technology (KOSEN), Nagano College

Bibliographic Information

Other Title
  • 自動車用超高強度TRIP型マルテンサイト鋼板のスポット溶接引張特性
  • ジドウシャヨウ チョウコウキョウド TRIPガタ マルテンサイト コウバン ノ スポット ヨウセツ ヒッパリ トクセイ

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Abstract

<p>Effect of heat-affected zone (HAZ) softening on tensile strength (TS) and total elongation (TEl) of spot welded ultrahigh strength TRIP-aided martensitic (TM) steel sheet was investigated for automobile applications. Tensile test was performed on an Instron type tensile testing machine at a crosshead speed of 3 mm/min (strain rate of 8.3×10–4 s–1), using spot welded specimen.</p><p>The results are as follows.</p><p>(1) The spot welded specimen at the current value (I) of 6.5 kA for the TM steel with the maximum stress (TS*) of 1450 MPa and the fracture elongation (TEl*) of 7.0% was superior to that of hot stamping steel (the HS1 steel), and it was found that the TS* and the TEl* for the TM steel possessed those of base metal specimen for the HS1 steel with the tensile strength (TS) of 1469 MPa and the total elongation (TEl) of 7.7%.</p><p>(2) The TRIP effect for the TM steel with an excellent strength-ductility balance (TS×TEl) of 14.4 GPa% (i.e. the tensile strength (TS) of 1532 MPa and the total elongation (TEl) of 9.4%) suppressed HAZ softening and was able to express a high maximum stress (TS*) of 1450 MPa for the TM steel of the spot welded specimen.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 106 (7), 438-447, 2020

    The Iron and Steel Institute of Japan

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