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| Microstructure Evolution Research of Cr-Co-Mo-Ni Gear and Bearing Steel Under Action of Temperature and Stress Coupling |
| HOU Zhi-peng1,2,YANG Mao-sheng2,ZHAO Kun-yu1,BAI Li-guo3 |
1.Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2. Special Steel Research Institute, Center Iron and Steel Research Institute, Beijing 100081, China
3.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract Creep-rupture test was performed under the temperature of 500℃ and different stresses for heat treated high temperature Cr-Co-Mo-Ni gear and bearing steel. The creep-rupture strength obtained by interpolation was 1022MPa at the state of 500℃ for 500h. The microstructure of the samples, before and after creep-rupture test, was investigated by OM, SEM and TEM. The results show that the rupture time extends from 96.4h to 845.8h, the average size of carbides in the matrix increases from 0.3μm to 0.5μm and the area ratio increases from 1.65% to 3.85% with the stresses reduced from 1150MPa to 950MPa at the state of 500℃. With the reduction of stresses and the extension of rupture time, the martensite lath changes with shear deformation, fragmentation and rearranges. And the dislocation density decreases. The precipitated phase is always M6C before and after creep-rupture test.
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Received: 30 August 2013
Published: 28 April 2014
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2014, Vol. 49 
