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Iranian Journal of Materials Forming، جلد ۱۰، شماره ۴، صفحات ۴۵-۵۱
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عنوان انگلیسی An Analysis of Efficiency Parameter and its Modifications Utilized for Development of Processing Maps
چکیده انگلیسی مقاله The efficiency parameter, which is frequently utilized in the literature, can be expressed as η=(2m/m+1), where m is the strain rate sensitivity. The efficiency parameter is determined from a set of m values based on the strain rate and the temperature displayed in a three-dimensional map known as the power dissipation map. This method works if the test results for σ vs.  at constant strain and temperature have a power-law distribution. Otherwise, it is incorrect to assess dissipation efficiency using the slope of the  graph. The present study proposes additional adjustments to the existing ones suggested in the literature for the prior technique by offering a scheme for evaluating η.  Power dissipation maps for different techniques are developed at strains of 0.2 and 0.7 using X80 steel as a model material. In spite of the fact that the approaches rely on different assumptions and that there are differences in the temperature and strain rate at which the dissipation efficiency peak appears, there are some similarities in the power dissipation maps of all approaches when they are compared at different strains. In conclusion, although the conventional approach is erroneous, it is the most feasible and straightforward one.
کلیدواژه‌های انگلیسی مقاله Metal Forming, Hot deformation, Efficiency parameter, Dissipation map, Processing map
نویسندگان مقاله H. Eskandari |
Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

M. Reihanian |
Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

S.R. Alavi-Zaree |
Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

نشانی اینترنتی https://ijmf.shirazu.ac.ir/article_7436_aa4d3393009f088954b66f673af5bbea.pdf
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