SA-06-5(120) CREEP DAMAGE AND CRACK GROWTH IN STEEL WELDS(Flaw Assessment at Elevated Temperature 1)
スポンサーリンク
概要
- 論文の詳細を見る
The operational experience in high temperature plants indicates that in the majority of cases where creep crack initiation and growth occurs, defects predominate in the vicinity of weldments. The state of the art in time dependent fracture analysis is that the concepts used for homogeneous bodies are commonly applied to creep crack growth in weldments. The crack growth rate is correlated with C^*(t) in the extensive creep regime according to ASTM standard E1457. However, specific issues pertinent to welds such as deformation and crack growth behaviour due to the variations in microstructure through weld cross-section and brittle HAZ call for a systematic study, as addressed in the present work. This paper reports on the creep deformation behaviour and analysis of crack growth data obtained on high strength martensitic steel Grade P91 similar welds at 600℃. The weldments were produced in pipe butt weld geometry. The tests were carried out on cross-weld compact tension, CT, type specimens for tests durations of 300 to 4000 hrs that produced crack growth data in small-scale creep to extensive creep ranges for welds and HAZs. The emphasis is placed on the test procedure and the crack tip parameters in correlating the creep crack growth in weldments that will lead to provision of guidelines for acceptable methodologies for assessment and analysis of laboratory creep crack growth test data of weldments.
- 一般社団法人日本機械学会の論文
- 2001-06-03
著者
関連論文
- SA-06-5(120) CREEP DAMAGE AND CRACK GROWTH IN STEEL WELDS(Flaw Assessment at Elevated Temperature 1)