The use of microstructural evolution in a coated nickel base superalloy, IN738, as a time–temperature recorder Mohamed R. Shaheedullah 2134/34902 https://repository.lboro.ac.uk/articles/thesis/The_use_of_microstructural_evolution_in_a_coated_nickel_base_superalloy_IN738_as_a_time_temperature_recorder/9230684 Nickel base superalloys are used for turbine blades in gas turbine engines, and are required to operate at very high temperatures (≈900°C) for long periods of time in an aggressive environment. A particular problem is that although the operating times of such blades are generally well-known, their effective operating temperatures are less well defined due to variations in position and metal-gas temperature. The microstructure of this material is known to evolve as a function of time and temperature. The aim of this research is to develop a model that will enable the microstructure to act as a time temperature recorder for IN738LC industrial gas turbine blades. [Continues.] 2018-09-17 13:28:24 untagged Materials Engineering not elsewhere classified