On the mechanical behavior of austenitic stainless steel with nano/ultrafine grains and comparison with micrometer austenitic grains counterpart and their biological functions

Mechanical behavior of the austenitic stainless steel under monotonic and cyclic loading at room temperature has been mathematically predicted. Materials like SS 316 LN exhibit cyclic hardening behavior under cyclic loading. Based on the characteristics of yield surface, cyclic hardening can be classified into isotropic and kinematic hardening. Armstrong-Frederic model is used for predicting the kinematic hardening of this material. It is basically a five parameter, nonlinear kinematic hardening model. Cyclic tests for various ranges were carried out to derive the isotropic material parameter required for modeling. Kinematic hardening material parameter required for modeling were computed based on both monotonic tension and torsion tests. By using these parameters the developed program is able to model the mechanical behavior of austenitic stainless steel under monotonic and cyclic loading conditions at room temperature. Comparison of the predicted results with the experimental results shows that the kinematic hardening material parameters derived from the monotonic torsion tests were in good agreement than that of the monotonic tension tests. Also it is recommended to use more material parameter constitutive models to improve the accuracy of the mathematical predictions for the material behavior under cyclic loading.

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Mechanical Behavior of a Metastable Austenitic Stainless Steel

10.1051/esomat/200906016 ◽

2009 ◽

Cited By ~ 1

Author(s):

P. Haušild ◽

P. Pilvin ◽

M. Karlík

Keyword(s):

Stainless Steel ◽

Austenitic Stainless Steel ◽

Mechanical Behavior ◽

Metastable Austenitic Stainless Steel

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.667-669.565 ◽

2010 ◽

Vol 667-669 ◽

pp. 565-570 ◽

Cited By ~ 2

Author(s):

Marina Tikhonova ◽

Valeriy Dudko ◽

Andrey Belyakov ◽

Rustam Kaibyshev

Keyword(s):

Stainless Steel ◽

Steady State ◽

Austenitic Stainless Steel ◽

Deformation Behavior ◽

Structural Changes ◽

Submicrocrystalline Structure ◽

Ultrafine Grains ◽

Maximum Value ◽

Average Size ◽

Super304h Steel

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.

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