Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7972656 | Materials Science and Engineering: A | 2018 | 23 Pages |
Abstract
The paper reports a substantial improvement of the static and cyclic strength of a Cr-Ni-Ti austenitic stainless steel nanostructured by equal channel angular pressing (ECAP). After ECAP at room temperature or 673â¯K, the mean grain size decreased from 14â¯Âµm to 430â¯nm or 940â¯nm, respectively; corresponding ultimate tensile strength increased from 610â¯MPa to 1230â¯MPa or 940â¯MPa, and the fatigue limit increased from 275â¯MPa to 375â¯MPa or 475â¯MPa. These enhanced strength properties result from the grain refinement assisted by the intensive twinning in the austenite during ECAP at room temperature and 673â¯K as well as partial martensitic transformation during ECAP at room temperature. Moreover, the partial martensitic transformation and an increase in the fraction of high angle grain boundaries during subsequent high-cycle fatigue tests were particularly favorable for the improvement of fatigue properties.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
S.V. Dobatkin, W. Skrotzki, O.V. Rybalchenko, V.F. Terent'ev, A.N. Belyakov, D.V. Prosvirnin, G.I. Raab, E.V. Zolotarev,