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KMID : 0381920130430040164
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Korean Journal of Microscopy
2013 Volume.43 No. 4 p.164 ~ p.172
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Microstructural Evolution of X20CrMoV12.1 Steel upon Short-term Creep Rupture Test
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Mariko Hino
Yinsheng He
Kejian Li
Chang Jungchel
Keesam Shin
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Abstract
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In this work, microstructural and hardness evolution of the X20 steel upon short-term creep test (550℃ to 650℃, 180℃ to 60 MPa) was studied by using scanning electron microscope, electron backscattered diffraction, and transmission electron microscope, microhardness tester. After creep rupture, gauge and grip part of the specimens were microstructurally analyzed. Creep at the 650℃/60 MPa resulted in a rupture at 1,460hours with growth of lath width from 1.31 to 2.87 μm and a grain growth with a more equiaxed feature. There is a close relationship between Microhardness and lath width. The formation and coarsening of Laves phase, which was observed up to 600℃ of creep temperature, was accelerated by the applied stress. Slight coarsening of the M23C6 was observed in the 550℃ and 600℃ crept or aged specimens. The coarsening of M23C6 depended on the temperature, where specimens crept at 650℃ showed higher growth rate. The microstructural evolution of X20 after short-term creep test was extensively discussed in relation to the long-term creep/aging test reported in teratures.
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KEYWORD
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12% Cr, Creep, Microstructure, Laves phase, Microscopy
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