Press Formability of YAG Laser Welded 0.3%C TRIP Steels

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  • YAGレーザ接合した0.3%C TRIP鋼板のプレス成形性
  • YAG レーザ セツゴウ シタ 0 3パーセント C TRIP コウハン ノ プレス セイケイセイ

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In the present work, to improve the press formability of the combination of the 0.3%C transformation-induced plasticity (TRIP)-aided dual-phase steel (TDP steel) and 0.1%C TDP steel, the mechanical properties and press formability (stretch-formability and deep drawability) of YAG laser welded tailored blanks were investigated. An as-cold-rolled sheet steel with the chemical composition of (0.1-0.3)C-1.5Si-1.5Mn (mass%) was used in this study. For butt welding, the blank obtained after the heat treatment was cut using a fine cutter, and YAG laser processing equipment was used. The press formability was evaluated from the maximum stretch-height (H_<max>) and the limiting drawing ratio (LDR). Tensile tests and press forming tests have been conducted for laser butt welded joints obtained from the combination of the different steel. It is thought that this was assisted to TRIP of the TDP steel because the tensile strength of the 0.1%C TDP steel is consequentially lower than that of the 0.3%C TDP steel. High ductility and the high stretch-formability were able to be secured by the tailored blank.

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