Modeling thermal and irradiation-induced swelling effects on the integrity of Ti3SiC2/SiC joints

JOURNAL OF NUCLEAR MATERIALS

卷:495

Article

Nguyen, Ba Nghiep¹  Henager, Charles H., Jr.¹  Kurtz, Richard J.¹ 

[1] Pacific Northwest Natl Lab, POB 999,MSIN J4-55, Richland, WA 99352 USA

关键词: SiC;    Fusion materials;    Joining;    Swelling;    Neutron irradiation;    Thermal expansion;    Damage modeling;    Finite element;   

DOI  :  10.1016/j.jnucmat.2017.09.011

来源: Elsevier

【 摘 要 】

Previously, results for CVD-SiC joined by a solid state displacement reaction to form a dual-phase SiC/MAX phase joint subsequently irradiated at 800 degrees C to 5 dpa indicated some cracking in the joint. This paper elucidates the cracking origin by developing a model that accounts for differential thermal expansion and irradiation-induced swelling between the substrate and joint materials by using a continuum damage mechanics approach with support from micromechanical modeling. Damage accumulation in joined specimens irradiated at four temperatures (300 degrees C, 400 degrees C, 500 degrees C and 800 degrees C) is analyzed. We assume the experimental irradiation dose is sufficient to cause saturation swelling in SiC. The analyses indicate that the SiC/MAX joint survives irradiation-induced swelling at all the irradiation temperatures considered. The joint experiences only minor damage when heated to and irradiated at 800 degrees C as well as cooling to room temperature. The prediction agrees with the experimental findings available for this case. However, the joint heated to 300 degrees C suffers severe damage during irradiation-induced swelling at this temperature, and additional damage after cooling to room temperature. Irradiation at 400 degrees C and subsequent cooling to room temperature produced similar damage to the irradiation 300 degrees C case, but to a lesser extent. The joint heated to 500 degrees C and irradiated at this temperature suffered only very minor damage, but further moderate damage occurred after cooling to room temperature. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free