Growth Kinetics of Laves Phase and Its Effect on Creep Rupture Behavior in 9Cr Heat Resistant Steel |
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| Affiliation: | 1. Shagang School of Iron and Steel,Soochow University,Suzhou 215021,Jiangsu,China;2. School of Mechanical and Electric Engineering,Soochow University,Suzhou 215021,Jiangsu,China;3. Laser and 0ptoelectronics Technologies Institute of Ningbo,China Academy of Engineering Physics,Ningbo 315100,Zhejiang,China;4. Suzhou Nuclear Power Research Institute,Suzhou 215004,Jiangsu,China |
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| Abstract: | The effects of Laves phase formation and growth on creep rupture behaviors of P92 steel at 883 K were studied.The microstructural evolution was characterized using scanning electron microscopy and transmission elec-tron microscopy.Kinetic modeling was carried out using the software DICTRA.The results indicated Fe2 (W,Mo) Laves phase has formed during creep with 200 MPa applied stress at 883 K for 243 h.The experimental results showed a good agreement with thermodynamic calculations.The plastic deformation of laths is the main reason of creep rupture under the applied stress beyond 160 MPa,whereas,creep voids initiated by coarser Laves phase play an effective role in creep rupture under the applied stress lower than 160 MPa.Laves phase particles with the mean size of 243 nm lead to the change of creep rupture feature.Microstructures at the vicinity of fracture surface,the gage portion and the threaded ends of creep rupture specimens were also observed,indicating that creep tensile stress enhances the coarsening of Laves phase. |
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| Keywords: | heat resistant steel Laves phase microstructure plastic deformation creep rupture |
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