An investigation was made on the creep crack growth behaviour under static load at 1023 Kfor Ni-base superalloy GH30 exposed to air and air+10% SO<sub>2</sub>.T
Studies were made of the calculation of fractal dimension of transverse impact fracture sur-face,and of the correlation between impact toughness of steel and pa
An additive of Y to Ni<sub>3</sub>Al based alloy may form a phase YNi<sub>5</sub> which increases in amount withthe increase of Y content.It was found that the
Creep crack growth behavior of Fe-Cr15-Ni25 alloys with different grain boundary featureshas been studied.Cavities nucleate at triple junctions of grain boundar