The microstructure and mechanical properties of T91 steel processed by ECAP at room temperature
The microstructure and mechanical properties of T91 steel processed by ECAP at room temperature
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DOI：
10.1016/j.jnucmat.2012.12.009
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发表时间：
2013-03
影响因子：
3.1
通讯作者：
Z. Fan;T. Hao;S. X. Zhao;G. Luo;C. S. Liu;Fang Qianfeng
中科院分区：
文献类型：
--
作者：
Z. Fan;T. Hao;S. X. Zhao;G. Luo;C. S. Liu;Fang Qianfeng
In this paper, the 9Cr–1Mo martensitic steel (T91) was processed by ECAP method at room temperature and annealed at 500°C for 2h subsequently. The optical and TEM micrographs exhibit that the average grain size was refined from 20μm for the initial sample to 200nm for the sample ECAP extruded six passes and the martensitic laths were severely destroyed during ECAP processing. With the increasing number of the extrusion passes, the microhardness and the tensile strength increase from 2.7GPa and 730MPa for the initial sample to 3.8GPa and 1160MPa for the sample extruded six passes, while the uniform elongation decreases from 23% to 10%, respectively. After the annealing, the grains grow slightly to 300nm, and the tensile strength of the samples extruded one and six passes decreases to 880MPa and 1140MPa while the elongation increases to 21% and 12%, respectively.
