Study of Transverse Shrinkage Generated in Steel with Phase Transformation by Welding

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  • 溶接によって生じる相変態を有する鋼の横収縮に関する研究
  • ヨウセツ ニ ヨッテ ショウジル ソウヘンタイ オ ユウスル コウ ノ ヨコ シュウシュク ニ カンスル ケンキュウ

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Abstract

This paper deals with the effect of phase transformation on the transverse shrinkage by comparing experimental data and numerical results of transverse shrinkage generated by welding. Both mild steel with non-transformation effect and 3.5Ni-steel with transformation effect were welded by laser welding. The transverse shrinkage of 3.5 Ni steel was almost equal to that of mild steel. This reason is the following two causes:(1) the transformation expansion on cooling process makes the transverse shrinkage small and (2) thermal shrinkage of austenite phase before martensite transformation on cooling process makes the transverse shrinkage large. The total shrinkage obtained from above two reciprocal causes on cooling process is not affected very much by phase transformation.

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