Model for the final stage of creep failure due to high temperature helium embrittlement

被引：7

作者：

Ryazanov, A ^{[1
]}

Voskoboinikov, RE ^{[1
]}

Trinkaus, H ^{[1
]}

机构：

[1] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, D-52425 JULICH, GERMANY

来源：

JOURNAL OF NUCLEAR MATERIALS | 1996年 / 233卷 / 233-237期

关键词：

D O I：

10.1016/0022-3115(95)00179-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High temperature helium embrittlement (HTHE) is characterized by nucleation and growth of helium bubbles on grain boundaries (GBs) and on triple grain Junctions (TGJs). The final stage of material failure in HTHE is due to premature crack nucleation and accelerated crack growth on GBs and TGJs containing helium bubbles. Crack nucleation would eventually take place by the coalescence of diffusionaly growing cavities but this process may be accelerated by stress concentrations at cavity arrays on GBs and particularly on TGJs due to slip and GB-sliding occuring during creep. In the present paper these processes are modeled in terms of interaction of cavity arrays with a pile-up of dislocations. The critical crack size is calculated in dependence upon cavity density, cavity size and gas content in cavities on TGJs. Fracture criteria for a material containing helium is formulated.

引用

页码：1085 / 1088

页数：4

共 14 条

[11] ENERGETICS AND FORMATION KINETICS OF HELIUM BUBBLES IN METALS [J].

TRINKAUS, H .

RADIATION EFFECTS AND DEFECTS IN SOLIDS, 1983, 78 (1-4) :189-211

[12] MECHANISMS CONTROLLING HIGH-TEMPERATURE EMBRITTLEMENT DUE TO HELIUM [J].

TRINKAUS, H .

RADIATION EFFECTS AND DEFECTS IN SOLIDS, 1987, 101 (1-4) :91-107

[13]

ULLMAIER H, 1992, MATER SCI FORUM, V97, P451, DOI 10.4028/www.scientific.net/MSF.97-99.451

[14] THE INFLUENCE OF HELIUM ON THE BULK PROPERTIES OF FUSION-REACTOR STRUCTURAL-MATERIALS [J].

ULLMAIER, H .

NUCLEAR FUSION, 1984, 24 (08) :1039-1083

← 1 2 →