Tensile　tests　and　ratcheting　tests　were　performed　on　a　316LN　austenitic　stainless　steel　at　300　°C,　400　°C,　500　°C,　and　600　°C,　respectively,　to　study　the　influence　of　dynamic　strain　aging　(DSA)　on　deformation　behavior　and　microstructural　evolution.　The　DSA　temperature　range　in　present　work　was　determined　to　be　≥　400　°C　in　both　uniaxial　tests　and　ratcheting　tests.　Especially　in　the　ratcheting　tests,　a　sudden　drop　in　ratcheting　strain　accumulation　as　well　as　in　steady　ratcheting　strain　rate　was　evident　when　the　temperature　raising　from　300　°　to　400　°C.　While　within　the　DSA　temperature　region,　the　ratcheting　behavior　was　insensitive　to　the　temperature.　Microstructural　examinations　revealed　dislocation　cells　and　tangles　in　the　sample　ratcheted　at　300　°C　(free　of　DSA),　while　complex　dislocation　structure　in　the　samples　ratcheted　at　≥　400　°C　(with　DSA)　that　was　consisted　mainly　by　high-density　dislocation　walls,　planar　slip　bands,　and　Lomer-Cottrell　locks.　This　clearly　indicates　a　change　in　predominant　ratcheting　deformation　mechanism　from　cross-slip　at　DSA-free　temperature　region　to　planar-slip　at　DSA　region.　It　was　further　demonstrated　that,　within　the　temperature　range　from　400　°C　to　600　°C,　the　DSA-induced　hardening　effect　balanced　with　the　thermally-activated　softening　effect　and　this　balance　led　to　temperature-insensitive　ratcheting　behavior　as　experimentally　observed.　Finally,　the　DSA-affected　dislocation　structure　was　quantitatively　evaluated　in　the　ratcheted　samples,　with　an　aim　in　correlating　to　the　ratcheting　behavior.　©　2022　Elsevier　B.V.