Abstract
An elastic plastic fracture toughness test was carried out at 4K and 290K to clarify the fracture mechanism of Inconel 718. It was revealed, at 4K, that pop-in behavior was dominant until final fracture and that this material was quite brittle. The elastic plastic fracture toughness corresponds well with plane strain fracture toughness. The tearing modulus is comparatively low if the energy level just before final pop-in is employed to obtain the J-R curve. On the other hand, at 290K, this material is ductile although the fracture toughness is less than that at 4K. The material strength contributes to the difference in fracture toughness between 4K and 290K. Microscopic examination shows that, at 4K, a small dimple zone is often located at the initial crack front although a cleavage facet or twinning is dominant at the fracture surface. However, at 290K, only a dimple zone is found on the fracture surface.
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