Life prediction for an iron-based superalloy

1997-08-15
Orhaner, FO
Tekin, E
Tubes made of Nb-stabilised 25%Cr35%Ni iron-based superalloys have been extensively used in the radiant sections of naphta cracking furnaces where ethylene production is done. Since the tubes are generally replaced before reaching their design lives of 100000 hrs for such systems realistic remaining life predictions become essential for economy and safety.

Suggestions

Performance assessment of cement grout borehole plugs in basalt
Akgün, Haluk (Elsevier BV, 1994-01-01)
Flow tests have been conducted on expansive cement grout plugs with diameters of 160 mm and 200 mm, and length-to-diameter ratios of one, in boreholes in basalt blocks and in steel pipes. Two types of flow tests have been performed: pseudo-constant head tests and transient pulse tests. Hydration temperatures of cement grout plugs have been monitored in steel pipes with inside diameters ranging from 110 mm to 200 mm. During flow tests, basalt blocks have fractured, presumably due to water injection pressure,...
Laboratory production of calcium sulfoaluminate cements with high industrial waste content
Canbek, Ogulcan; Shakouri, Sahra; Erdoğan, Sinan Turhan (Elsevier BV, 2020-02-01)
A drawback of conventional calcium sulfoaluminate (CSA) cement production is the use of the costly raw material bauxite as a source of alumina to form the main clinker phase ye'elimite. Replacement of bauxite with industrial wastes can benefit CSA cements economically and environmentally. This study demonstrates the use of high amounts of red mud, a sulfate-rich/high-lime fly ash, and desulfogypsum as raw materials in producing CSA clinkers and cements with better mechanical performances than an all-natural...
Compressive strength development of calcium aluminate cement-GGBFS blends
Kirca, Onder; Yaman, İsmail Özgür; Tokyay, Mustafa (2013-01-01)
The compressive strength development of calcium aluminate cement (CAC) and ground granulated blast furnace slag (GGBFS) blends that were subjected to different curing regimes are investigated. The blends had GGBFS/CAC ratios between 0% and 80%, by mass. Mortar specimens, prepared with a water:binder:sand ratio of 1:2:6, were subjected to seven different curing regimes and the compressive strengths were monitored up to 210 days. In order to understand the effect of temperature on compressive strength develop...
Recycling of Polymer Waste Using Different Techniques
Sivri, Seda; Sezgi, Naime Aslı; Dilek Hacıhabiboğlu, Çerağ; Department of Chemical Engineering (2023-1-26)
Polylactic acid (PLA) is the most widely known renewable biodegradable polymer due to its mass production, good processability, optical, mechanical, thermal, and barrier properties. Hence, the production rate of PLA increased gradually during the last decade. However, PLA is known to have slow degradation rate in soil and marine environments, leading to significant waste accumulation with widespread usage of the polymer. Thus, recycling of PLA waste will become a significant environmental concern in near fu...
Torrefaction of pine wood in a continuous system and optimization of torrefaction conditions
Keivani, Babak; Gultekin, Selin; OLGUN, HAYATİ; Atımtay, Aysel (2018-12-01)
Red pine wood particles were torrefied in a screw conveyor reactor system continuously having a capacity of 5 kg/hour. During torrefaction, operating conditions were very important. Changes in the reactor temperature and the reactor residence times had large influences on product yields. With increasing torrefaction temperature, the volatile matter and oxygen content of biomass decreased, while fixed carbon content and heating value greatly increased. Design-Expert software package was used for the design o...
Citation Formats
F. Orhaner and E. Tekin, “Life prediction for an iron-based superalloy,” 1997, p. 769, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65665.