Wakasa K, Yamaki M, Nakatuka A, Nishimura T
Shika Rikogaku Zasshi. 1981 Oct;22(60):290-4.
Early-fracture in tensile specimens was found in Ni-base casting alloys which were obtained in conventional casting condition. In 32 Ni-23 Cu-25 Mn alloy, intercrystalline fracture occurred in both early-fractured and normal ductile specimens. On the contrary, intercrystalline and innercrystalline fracture were, respectively, found in early-fractured and normal samples. As the fracture process, voids formed by stress-concentration around A-grain and brittle fracture of soft B-grain in 32 Ni-23 Cu-25 Mn alloy, while voids occurred by stress-concentration around inclusion as chromium carbide and slip deformation on the maximum shear stress plane in 84 Ni-9 Cr alloy.
在常规铸造条件下获得的镍基铸造合金的拉伸试样中发现了早期断裂。在32Ni-23Cu-25Mn合金中，早期断裂和正常韧性试样均出现沿晶断裂。相反，在早期断裂和正常试样中分别发现了沿晶断裂和穿晶断裂。作为断裂过程，在32Ni-23Cu-25Mn合金中，A晶粒周围因应力集中形成孔洞，软B晶粒发生脆性断裂；而在84Ni-9Cr合金中，孔洞是由碳化物等夹杂物周围的应力集中形成的，并且在最大剪应力平面上发生滑移变形。
