The effect of hydrogen on fracture toughness of the Fe-Ni-Co superalloy IN903 Moody, N. R. ; Stoltz, R. E. ; Perra, M. W. Abstract Publication: Metallurgical Transactions A Pub Date: August 1987 DOI: 10.1007/BF02646659 Bibcode: 1987MTA....18.1469M