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scientific edition of Bauman MSTU
SCIENCE & EDUCATION
Bauman Moscow State Technical University. El № FS 77 - 48211. ISSN 1994-0408
Study of Short–Time Creep of New Turbine Steel
# 11, November 2014
DOI: 10.7463/1114.0733687
Article file:
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Low-carbon steels have good corrosion and technological properties. Hot deformation is the main operation to make details from these steels. Mathematical modeling of steel stress-strain behavior is used to optimize the process of hot forming. The purpose of this work is an experimental study of the mechanical properties of low-carbon alloy steel 01X13N04 at high temperatures. L.M. Kleiner, N.P. Melnikov, and I.N. Bogachyova focused on the microstructure of these steels and on the influence of structural parameters over mechanical properties in their works.
The article mainly emphasizes the construction of mathematical model correctly describing a behavior of the material at high temperatures. The phase composition was defined by theoretical analysis of the steel at specified temperatures. Flat samples were tested by tension in vacuum at temperatures 850°C-1000 °C. The resulting diagram was converted into actual stress - the actual strain taking into account changes in the cross-sectional area. The resulting curves can be conventionally divided into two parts: the hardening up to the maximum stress and, after reaching the maximum stress, necking, which leads to destruction. The hardening up to the maximum stress was studied in details. The material is uniformly deformed there. Necking and its evolution are not considered. The best description of the curves corresponds to the theory of creep hardening. For the most accurate description of the phenomenon, dependences on the grain size and temperature were introduced in equation. Parameters of the equation were determined by the least square method. Analysis of parameters has shown that material has low strain rate sensitivity. Attention was also paid to the verification of the results. Comparison of experimental and theoretical curves of deformation at different strain rates confirmed that the chosen law and set parameters are adequate.
References
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Publications with keywords: tension, deformation, low-carbon stainless steel, creep
Publications with words: tension, deformation, low-carbon stainless steel, creep
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