Enhancing the high temperature plasticity of a Cu-containing austenitic stainless steel through grain boundary strengthening

摘要: Abstract The addition of 3 wt% Cu to heat-resistant SUS 304H austenitic steel enhances its high temperature mechanical properties. To further improve the properties, particularly creep resistance and ductility at temperatures, a post-solutionizing heat-treatment method that involves an intermediated annealing either 700 or 800 °C after solutionizing for durations up 180 min was employed. purpose this is precipitate planar Cr 23 C 6 grain boundaries, which results in boundaries getting serrated. Detailed microstructural analyses these ‘grain boundary engineered’ alloys conducted their performance, both room 750 °C, evaluated. While size texture are unaffected due hold, volume fraction Ʃ3 twin found increase significantly. strength enhancement only marginal, significantly, especially temperature. A marked also noted, attributed reduction sliding by serrations suppression cavitation through optimization spacing precipitates. special performed with holding time 3 h 700 °C resulted optimum combination strength,