Microstructure Impacts on Mechanical Properties in a High Temperature Austenitic Stainless Steel
Austenitic and super-austenitic stainless steels are a critical component of the spectrum of high temperature materials. With respect to power generation, alloys such as Super 304H and NF709 span a gap of capability between ferritic and martensitic high chromium steels and nickel-based alloys in boiler tube applications for both conventionally fired boilers and heat-recovery steam generators (HRSG). This research explores a wrought version of a cast austenitic stainless steel, CF8C-Plus or HG10MNN, which offers promise in creep strength at relatively low cost. Various manufacturing techniques have been employed to explore the impact of wrought processing on nano-scale microstructure and ultimately performance, especially in high temperature creep. Transmission electron microscopy has been used to quantify and characterize the creep-strengthening particles examining the relationship between traditional melting and extrusion as compared to powder metallurgy.
Purdy, D.; Maziasz, P. J.; Wharry, J.; and Dolph, C.. (2016). "Microstructure Impacts on Mechanical Properties in a High Temperature Austenitic Stainless Steel". Advances in Materials Technology for Fossil Power Plants: Proceedings from the 8th International Conference, 377-387.