The Formation of Submicrometer Scale Grains in a Super304H Steel during Multiple Compressions at 700°C

Marina Tikhonova; Valeriy Dudko; Andrey Belyakov; Rustam Kaibyshev

doi:10.4028/www.scientific.net/MSF.667-669.565

Paper Titles

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Microstructure and Mechanical Properties of Ultra-Fine Grain AZ80 Alloy Processed by Back Pressure Equal Channel Angular Pressing
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Nanostructure Evolution in an Austenitic Stainless Steel Subjected to Multiple Forging at Ambient Temperature
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Mechanical Properties and Microstructures of Severely Plastic Deformed Pure Titanium by Mechanical Milling and Spark Plasma Sintering
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The Formation of Submicrometer Scale Grains in a Super304H Steel during Multiple Compressions at 700°C
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Processing of Ultrafine Grained Cu-30%Zn Alloy through Severe Plastic Deformation Using Accumulative Roll Bonding
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The Evolution of Texture in AA 1050 Alloy Deformed by Equal-Channel Angular Pressing
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Production of Bulk Ultrafine Grained Steel through Severe Plastic Deformation
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Anomalous Property Evolution during Annealing in HPTed SUS 304 Austenitic Stainless Steel
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The Formation of Submicrometer Scale Grains in a Super304H Steel during Multiple Compressions at 700°C

Abstract:

The deformation behavior and the microstructure evolution in a 304-type austenitic stainless steel were studied in multiple forging tests at temperature of 700°C. The flow stresses increased to its maximum value with straining to about 1 and, then, slightly decreased resulting in a steady state deformation behavior at strains above 3. The structural changes were characterized by the development of a spatial net of deformation subboundaries, the misorientations of which increased to the values typical of conventional grain boundaries. The number of ultrafine grains increased with straining, leading to development of submicrocrystalline structure. The fraction of submicrocrystalline structure composed of ultrafine grains with an average size of about 300 nm exceeded 0.7 after straining to 2.