Disbonding of Overlay Weldment in V-modified 21/4Cr-1Mo Steels

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  • V添加21/4Cr-1Mo鋼の肉盛溶接部の剥離割れ特性
  • V テンカ 21 4Cr 1Mo コウ ノ ニクモリ ヨウセツブ ノ ハクリ

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Abstract

The effect of V on the disbonding between 2 1/4Cr-1Mo steels and austenitic stainless steel overlay was studied metallurgically. The addition of V into the base metal increases resistance to disbonding significantly. STEM and EDX observation showed that the fine precipitates are different in morphology, distribution and composition between V-modified and ordinary steels. The analyses of hydrogen diffusion and hydrogen evolution indicated that the fine precipiates in V-modified steel trap hydrogen and as a result increase the solubility of hydrogen and decrease the diffusion of hydrogen. Theoretical calculation of hydrogen distribution during cooling from high temperature and high pressure conditions showed that both diffusion and solubility of hydrogen in the base metal affects the concentration of hydrogen at the interface between base metal and stainless steel overlay. It is concluded that the fine precipitates in V-modified steel increase resistance to disbonding by reducing the concentration of hydrogen at the interface during cooling.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 75 (5), 798-805, 1989

    The Iron and Steel Institute of Japan

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