Creep rupture ductility of Gr.91 and Gr.92 at 550°C to 700°C. (3rd July 2020)

• Record Type: Journal Article
• Authors: Abe, Fujio
• Is Part Of: Materials at high temperatures. Volume 37:Number 4(2020)
• Page Start: 243
• Page End: 255
• Publication Date: 2020-07-03
• Subjects: Gr.91 -- Gr.92 -- time to rupture -- reduction of area -- total elongation -- boron nitride -- creep void -- necking -- creep ductility parameter; Materials at high temperatures -- Periodicals; High temperatures -- Periodicals; 620.1121705
• DOI: 10.1080/09603409.2020.1771659
• Languages: English
• ISSNs: 0960-3409

Abstract

ABSTRACT: The creep rupture ductility has been investigated for Gr.91 and Gr.92 at 550 to 700°C for up to 118, 648.8 h. The degradation in the reduction of area (RA) is more significant in Gr.92 than in Gr.91 at 550°C to 700°C. The boron nitride particles are responsible for the degradation in RA in Gr.92 at long times by accelerating the formation of creep voids. The creep ductility parameter λ decreases to small values below 5 for Gr.92 at long times at 650°C and 700°C, while that is larger than 5 for Gr.92 at 550°C and 600°C and for Gr.91 at 550°C to 700°C. The data exhibiting λ > 5 and λ < 5 in the λ versus time diagram correspond to the data in the necking and creep void dominant regions, respectively, in the RA versus total elongation diagram.