冷間加工した純チタンの粒界ぜい化と応力腐食割れ(腐食防食小特集)

概要

論文の詳細を見る
The susceptibility to intergranular embrittlement and stress corrosion cracking (SCC) of cold-rol-led commercially pure titanium in a CH_3OH/0.4% HCl solution at room temperature was examined fractographically. The results obtained from stress-free exposure tests showed a very small weight loss. In the subsequent tensile tests in air, the mechnical properties deteriorated greatly due to intergranular embrittlement though there was less dependent on rolling reduction. The resulting appearance consisted of intergranular and ductile fracture of which the area fraction approximated to a constant value, independently of rolling reduction. The threshold stress to SCC occurrence did not exist essentially, and its potential range corresponded with the active region of anodic polarization diagram. The uneven general corrosion appeared when the potential was moved to the positive direction. The fracture modechanged from an intergranular into a transgranular fracture which was characterized by the fluted pattern. Here, the former are a fraction increased with increasing rolling reduction and the latter inversely disappeared.
1994-11-15