Effect of rare earth alloying on creep rupture of economical 21Cr-11Ni-N heat-resistant austenitic steel at 650 °C
作者： Lei CHEN , Hongjun LONG , Xingang LIU , Miao JIN , Xiaocong MA
DOI: 10.1016/S1002-0721(16)60047-9
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摘要: Abstract The effect of rare earth (RE) on creep rupture economical 21Cr-11Ni-N heat-resistant austenitic steel was investigated at 650 °C under different stress levels. It found that RE could increase the time to rupture, especially long-term duration. logarithm (lg t r ) a linear function applied (σ). addition favorable generating high fraction low-coincidence site lattice (CSL) boundaries which possible cause for improving resistance. fracture surface RE-added exhibited less intergranular cracks suggesting alteration nature grain due presence RE. changed morphology chromium carbides from continuous network shape fragmentary distribution another longer These results strongly suggested alloying played crucial role in
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