The influence of electron-beam welding parameters on heat-affected-zone microfissuring in INCOLOY 903

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INTRODUCTION

INCOLOY* 903 is a wrought low coefficient of expansion Fe-Ni-Co base superalloy hardened by Ni3(A1, Ti, Nb) 3/' phase. Its coefficient of expansion value of about one-half of the conventional Fe-Ni- or Ni-based superalloys is achieved through a low (