Metallurgical evaluation of creep-failed superheater tubes

The dynamic creep rupture of a secondary superheater tube in a 43MW coal-fired boiler by the decarburization and multilayer oxide scale buildup on both sides

“…The classic methodology applied the Larson-Miller Parameter (LMP) to analysis the tube life [5][6][7][8]. In recent studies, researches focused on the aspects of metallurgical and oxide scales [9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Corrosion in biomass combustion: A materials selection analysis and its interaction with corrosion mechanisms and mitigation strategies

“…Creep is defined as a time-dependent plastic deformation under static stresses usually significant at temperatures above one 0.3-0.5T m where T m is the melting temperature of metals [206]. The relevance of creep for the mechanical stability of boiler tubes has been highly recognized by many authors [207][208][209]. Hence, creep strength can be a valuable criterion to rank the best candidates for superheater tubes in biomass-fired boilers.…”

Failure of Secondary Superheater Tube by Caustic Stress Corrosion Cracking (CSCC)

“…Many case studies are reported in the literature about boilers and especially superheater failures, most of which are caused by creep [1][2][3][9][10][11][12]. Movahedi-Rad et al [1] studied a case of superheater tube failure in which lowgrade fuel was used, tubes were overheated, and scale and carbide formation resulted in the final fracture.…”

“…Movahedi-Rad et al [1] studied a case of superheater tube failure in which lowgrade fuel was used, tubes were overheated, and scale and carbide formation resulted in the final fracture. Psyllaki et al [2] focused on the metallurgical factors influenced during high-temperature operation of a pipeline that resulted in its short-time failure by creep rupture in a lignite power plant unit. Purbolaksono et al [3] studied failure of the SA213-T12 primary superheater tube by visual inspection, in situ measurements of hardness, and finite element analyses.…”