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Microstructure Control And Correlation To Creep Properties In Grade 91 Steel Weldment After Thermo-Mechanical Treatments And An Fe-30cr-3al Alloy Strengthened By Fe2nb Laves Phase, Benjamin Allen Shassere
Microstructure Control And Correlation To Creep Properties In Grade 91 Steel Weldment After Thermo-Mechanical Treatments And An Fe-30cr-3al Alloy Strengthened By Fe2nb Laves Phase, Benjamin Allen Shassere
Doctoral Dissertations
Type IV cracking in weldments of steel pipes after creep deformation is a concern in modern fossil-fueled power plants. Two possible methods for minimizing or eliminating Type IV cracking will be discussed. The first method alters the initial microstructure of typical Grade 91 steel base metal before welding, while the second provides baseline microstructure characteristics and creep performance of a new alloy that is strengthened by the intermetallic Fe2Nb Laves phase. The initial microstructure of the Grade 91 steel can be controlled by Thermo-Mechanical Treatments, which aids in precipitation of fine (5-10 nm) MX particles in austenite before transformation to …
Evaluation Of The Potential For Weld-Related Cracking In Cast 20cr-32ni-1nb Heat-Resistant Stainless Steel, John William Bohling
Evaluation Of The Potential For Weld-Related Cracking In Cast 20cr-32ni-1nb Heat-Resistant Stainless Steel, John William Bohling
Masters Theses
Steam reforming of hydrocarbons is an important process for the production of hydrogen for industrial needs, such as ammonia synthesis. Due to the high temperature conditions (700 °C–900 °C), reformer furnace components require materials with excellent creep properties and thus highly alloyed austenitic stainless steels are typically employed. For reformer outlet manifolds, a cast, heat-resistant stainless steel with the composition 20Cr-32Ni-1Nb (ASTM A351 Grade CT15C) is widely used. However, after service exposure this alloy exhibits problems with liquation cracking in the base metal heat-affected zone (HAZ) during repair welding. In the work presented herein, two heats of material from centrifugally-cast …