|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical and Creep Behavior of Advanced Materials: A SMD Symposium Honoring Prof. K. Linga Murty
||L-118: High Temperature Tensile Properties and Related Microstructural Evolution of Grade 92 Steel
||Sultan F. Alsagabi, Somayeh Pasebani, Indrajit Charit
|On-Site Speaker (Planned)
Ferritic-martensitic steels with good high temperature mechanical properties have many promising applications in fossil and nuclear power plants. In this work, a F92 steel was tensile tested from room to elevated temperatures (up to 700<SUP>o</SUP>C). This material exhibited higher strength than traditional P92 steels. The reasons for the observed changes in mechanical properties were investigated by studying microstructural characteristics in deformed specimens using transmission electron microscopy. The microstructural evolution accelerated significantly under loading as temperature increased. For instance, the deformed microstructure at 600°C showed early stages of M<SUB>23</SUB>C<SUB>6</SUB> precipitate formation under loading. These M<SUB>23</SUB>C<SUB>6</SUB> precipitates showed more coarsening tendency whereas the MX-type precipitates retained their size. As coarsening of M<SUB>23</SUB>C<SUB>6</SUB> precipitates progressed at elevated temperatures, the strength gradually decreased as the solid solution strengthening deteriorated by removing W and Mo from the solid solution matrix. High temperature creep properties of this steel is also discussed.
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