ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The features of the creep deformation of γ-single phase single crystals with thecomposition of Ni-20mass%Cr are characterized by the extended transient stage, which consists ofStage I and Stage II. In the Stage I, the creep rate just after loading remains unchanged, while thecreep rate decreases continuously in Stage II.In the single crystals except for the single crystals with the stress axis of [001] and [1,–11], thepredominant creep deformation using the primary slip plane continues. By this deformation, thecross section of specimen turns to elliptical in shape. However, in the single crystals with theangle between stress axis and primary slip plane (111) is more than 45°, the deformation using theprimary slip plane does not continue, as a result, the duration of Stage II turn to shorter one. Thesingle crystal with the stress axis of [011] has the largest angle of 55°.In this study, the deformation manner during transient stage of single crystal with the stress axisof [011] orientation is investigated from the two viewpoints. The first one is to clarify the changein deformation manner with decreasing the stress. As a result, with decreasing the stress, the StageI become clear and strain during Stage I and Stage II become small, furthermore, the decreasingratio of creep rate with definite strain becomes larger. While, the second viewpoint is toinvestigate the change in crystallographic orientation of the [011] single crystals with creepdeformation using the inverse pole figure obtained by the EBSD method. As a result, at the stressof 29.4 MPa, the spot of stress axis turns from the [011]-[1,–11] line to the 〈1,–01〉 direction.While, at the stress of 19.6 MPa, the stress axis moves for the [1,–11] pole along the [011]-[1,–11]line from the [011] pole. And, it is noteworthy that the spot widely spread from the [011] poleduring transient stage. This indicates the large distortion in the primary slip plane and theevidence of heterogeneous deformation
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.870.pdf
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