@article{scholars9151,
           pages = {38--54},
       publisher = {Inderscience Publishers},
         journal = {International Journal of Microstructure and Materials Properties},
            year = {2017},
           title = {Investigation on microstructure and mechanical properties on varying surface region of a serviceexposed IN738 turbine blade},
             doi = {10.1504/IJMMP.2017.087661},
          number = {1-2},
            note = {cited By 0},
          volume = {12},
            issn = {17418410},
          author = {Owolabi, A. L. and Megat-Yusoff, P. S. M. and Said, M. A. M.},
        keywords = {Carbides; Coarsening; Creep; Grain boundaries; High resolution transmission electron microscopy; Mechanical properties; Nickel alloys; Ostwald ripening; Precipitation (chemical); Structure (composition); Superalloys; Tensile stress; Turbine components, Contributing factor; Creep properties; Gamma prime; Grain boundary carbides; Hardness values; Microstructural transformations; Microstructure and mechanical properties; Propagation of cracks, Turbomachine blades},
             url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032664672&doi=10.1504\%2fIJMMP.2017.087661&partnerID=40&md5=661b83f31bffcc4d9747e5b2c5fddbf0},
        abstract = {The study investigates the microstructural transformation and mechanical properties of nickel-based IN738 super-alloy turbine blade after service exposure of 52,000 h at temperature of {\^A}{$\pm$}720{\^A}oC for the degradations and stress rupture profile. The grain boundary carbides, decomposition and the transformation of MC carbides (gamma prime ({\^I}3) and creep cavities are analysed. The growth of {\^I}3 precipitates in the microstructure was investigated using transmission electron microscopy. It was observed that gamma prime ({\^I}3) possesses high coarsening at inter-dendritic area than in the dendrite core. Thus implies a contributing factor in the interface between the carbides, grain boundaries and the gamma prime ({\^I}3) films preferential location for nucleation and propagation of cracks and creep cavities. The coarsening behaviour of {\^I}3 precipitates adhere with the Ostwald ripening. The average hardness values of the inside and outside portion of the turbine blade was 325 and 298 HV10, respectively. {\^A}{\copyright} 2017 Inderscience Enterprises Ltd.}
}