Papers by Keyword: R-Value

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Authors: K. Clay, P.N. Quested, Roger Morrell, Ken P. Mingard
Abstract: Control of single crystal orientation in modern gas turbine components is a critical quality control issue for optimum reliable behaviour, and an increasingly important aspect of trade. This paper reviews industrial practice for the determination of primary crystal orientation and for the determination of 'disorientation' (R-value) between sub-grains. Different techniques and measurement conventions are compared, and the errors of measurement have been assessed through a European round-robin. Causes of poor reproducibility in 'disorientation' measurement have been identified by EBSD investigations. Recommendations for unified practice have been made in a Good Practice Guide as a precursor to a new industry-wide standard.
Authors: F. Kaiser, Dietmar Letzig, Jan Bohlen, A. Styczynski, Ch. Hartig, Karl Ulrich Kainer
Authors: Natsuko Sugiura, Naoki Yoshinaga
Abstract: Electro-deposited pure iron has a very sharp and isotropic <111>//ND fiber texture and a needle shaped grain elongated in the ND. This pure iron exhibits an r-value of over 7, and it is difficult to explain such a high r-value only from the texture. Specific {110} plane slips, which are perpendicular to the sheet surface, exclusively act in this material and this limitation of the active slip system is the main mechanism behind the extraordinarily high r-value. Thus, tensile deformation by this slip system doesn’t require a decrease in thickness. In this study, the mechanism of this slip system limitation is investigated. Because both the {110} slip plane and grain boundary are perpendicular to the sheet surface, the slip plane can easily connect with adjacent grains. This good continuity of slip plane with adjacent grain may have an influence on the choice of slip system.
Authors: Taku Sakai, K. Yoneda, Yoshiyuki Saito
Authors: Chad W. Sinclair, J.D. Mithieux
Abstract: Obtaining optimal mechanical properties for highly formable ferritic stainless steel sheet requires careful control over recrystallization and texture. This is, in some cases, hampered by the slow approach to final recrystallization associated with the disappearance of deformed grains with particular orientations. The important mechanical properties for formability (e.g. the yield strength and r-value) are thus strongly dependent on the final few percent recrystallization. In this study, it has been attempted to correlate the microstructure and texture of ferritic stainless steel sheet to its mechanical properties as measured in uniaxial tension. It is shown that careful consideration of the evolution of texture and microstructure with recrystallization may explain the observed trends.
Authors: Natsuko Sugiura, Naoki Yoshinaga
Abstract: Electro-deposited pure iron has a quite sharp and isotropic <111>//ND fiber texture and a needle-shaped grain elongated in ND. This pure iron shows an r-value exceeding 7, which is difficult to explain from the texture alone. In this study the deformation behavior of electro-deposited pure iron was investigated to reveal the mechanism behind the extremely high r-value. The post-deformation surface slip lines indicated that the particular <110> plane slips, which are perpendicular to ND, exclusively act in the specimen. The tensile deformation caused by this slip system does not require any decrease in thickness, hence the extraordinary high r-value is mainly attributable to this limitation of the active slip system. Presumably, the needle-shaped microstructure affected the limitation of the slip system.
Authors: Y. Funakawa, T. Inazumi, Yoshihiro Hosoya, T. Murayama
Authors: Shi Hoon Choi, Jin-Hwan Chung
Authors: Zhan Ying Liu, Yang Liu, Yu Qian Wang, Jin Chen
Abstract: Through the rolling and performance test, effect of cold-rolled micro-carbon steel rolling parameters and annealing temperature has been obtained on deep-drawing properties. Rolling texture was detected by X-ray diffraction and analyzed by a quantitative of ODF. R-plastic strain ratio was consistent with texture analysis, which provided with a basis for formulating the process parameters of cold-rolled and annealing of micro-carbon steel.
Authors: Zhan Yinɡ Liu, Yu Qian Wang, Xin Lu, Jin Chen
Abstract: Rub of roll and strip has effect on the texture form of surface strip, in IF steel rolling. The <110>//ND density decreased in surface strip in good lubrication condition rolling, the rolling texture become evenly in thickness direction, {111} texture is dominant, so that r-value increased. Otherwise, the {111} texture become unevenly and r-value decreased. It is must better lubricated for r-value rise, the conclusion is verified by the rolling text and texture analysis.
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