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Email this article PERANAN UNSUR REFRAKTORI DIDALAM NICKEL-BASED SUPERALLOYS: SUATU REVIEW[
Abstract
Nickel based superalloys digunakan secara luas sebagai sudu turbin gas mesin pesawat dan pembangkit listrik karena memiliki kapabilitas suhu tinggi yang dapat mempertahankan kakuatan struktur dan stabilitas permukaan. Penambahan unsur refraktori terutama rhenium (Re) ke dalam superalloy berbasis nikel berpengaruh besar terhadap peningkatan kekuatan mekanik pada suhu tinggi khususnya ketahanan terhadap creep. Akan tetapi penambahan dengan jumlah yang besar akan mengakibatkan munculnya fasa TCP yang tidak diinginkan pada kondisi operasi suhu tinggi. Tulisan ini akan mengulas “the role” dari unsur Re ini di dalam superalloy berbasis nikel terutama dikaitkan dengan faktor-faktor penting di dalam material suhu tinggi. Faktor-faktor yang diulas adalah koefisien partisi, misfit kisi, dan perilaku interdifusi unsur rhenium didalam paduan nikel. Akan diulas juga pengembangan nickel based superalloys generasi keempat yang mengandung komposisi yang cocok antara Re dan Ru.
Abstract
Nickel based superalloys are widely used in the aircraft engine and in the land-based gas turbine as the blade material due to its high temperature capability to maintain structural strength and surface stability at elevated temperatures. The addition of refractory elements, particularly rhenium into single crystal nickel based superalloys increases high temperature mechanical properties remarkably especially creep resistance. However, the addition of refractory elements in a large amount in the superalloys induces the formation of the deleterious TCP phases at high temperature. This paper overviews the role of rhenium in the single crystal nickel based superalloys in relation with the important factors in the high temperature processes such as partition coefficient, lattice misfit and interdiffusion behavior of rhenium in the superalloys. In addition, the development of the fourth generation of single crystal nickel based superalloys containing rhenium and ruthenium is discussed briefly
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