Selection of Hot Plastic Deformation Regimes for Large Workpieces According to Mechanical Energy Distribution Criteria
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SELECTION OF HOT PLASTIC DEFORMATION REGIMES FOR LARGE WORKPIECES ACCORDING TO MECHANICAL ENERGY DISTRIBUTION CRITERIA B. K. Barakhtin,1 S. N. Petrov,2 K. A. Okhapkin,3 Yu. M. Markova,4 and E. A. Vasil’eva5
UDC 669.018.48:621.73.01
Work is devoted to selecting parameters for a hot plastic deformation regime for alloy KhN55MVTs-ID on the basis of analyzing a distribution map for mechanical energy dissipation coefficients. The map is constructed from results of simulation modeling of deformation regimes for alloy samples in the temper–3 –1 ature range 900–1140 °C and strain rates of 10 –10 sec . Metallographic analysis and a study of the sructure using electron microscopy are used for dissipation coefficients close to extreme values. The expediency of using a map for the process of finding favorable conditions for hot plastic deformation of alloy KhN55MVTs-ID is demonstrated. Keywords: heat-resistant alloy, hot plastic deformation, simulation modeling, dissipation coefficient, microstructure.
For atomic energy engineering objects that during operation experience high energy action of various nature nickel alloy KhN55MVTs-ID has been developed with a γ-solid solution structure. Use of a solid solution strengthening mechanism and selection of the original alloy system makes it possible to provide long-term stability for a set of alloy structural and mechanical properties. The complex production cycle for preparing semifinished products, including melting in a vacuum induction furnace, vacuum-arc remelting, and forging in presses requires detailed analysis and control of hot plastic deformation regimes with the aim of maintaining metal quality taking account of features of structural changes within the material during production. The problem of selecting a hot working regime acquires especial importance when plastic deformation of large ingots of strong alloy is required, intended for operation under conditions of thermal and other complex actions [2]. One version of resolving this problem is simulation modeling of plastic deformation actions. Data obtained in a real time regime (in situ) about the mechanical behavior of test alloy in the form of estimates of introduced mechanical energy distribution will make it possible to construct a map of the process on “plastic deformation rate–temperature” coordinates. By means of this it is possible to find an answer to the question of what to do. The following verification of solutions with procedures of structural studies answers the question of what the result may be. An overall conclusion makes it possible to select the best metal treatment regime. The Aim of the Work is demonstration and substantiation of the efficiency of using maps for a process plotted from simulation modeling data for hot plastic deformation operations. NITs Kurchatov Institute, TsNII KM Prometei, St. Petersburg, Russia. 1 E-mail: [email protected]. 2 3 4 5
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