Rate Of Growth Of Wedge Type Intercrystalline Creep Micro-cracks Of Nickel Aluminide Alloys
Author(s)
A.M. Hashem
Abstract
Rate of growth of wedge type intercrystalline
creep micro-cracks of nickel aluminide alloys
A.M. Hashem
Production Eng. & Design Dept., Faculty of Engineering, Minia
University, Egypt
Abstract
Under high temperature creep is active. Intercrystalline creep micro-cracks
takes place due to the initiation and growth of intercrystalline cavities.
Polycrystalline nickel aluminide with boron alloy was investigated. This
alloy was produced by powder metallurgical using Hot Isostatic Pressing
(HIP). Various heat treatments were used to produce different initial grain
size. The grain sizes were 20.7, 21.05, 101.5 and 106.0 p.m. The micro-
cracks has been studied after creep fracture at a temperatures of 800, 850
and 900 °C and a stress levels of 20 to 90 MPa. The creep fracture surfaces
of longitudinal section of specimens which exhibited creep were examined
by using an image analysis system. The growth rate, length, thickness and
area of the micro-crack of the fractured speci
Keywords
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