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Outline
The effects of two different deformation processes（process 1 and process 2） on the micro-structure and mechanical properties of reduced activation ferrite/martensite （RAFM） steel （Fe-0.21C-11.76Cr-1.41W-0.20V-0.17Ta-0.63Si-0.51Mn-0.015N， mass fraction/%） tubes are studied. The results show that when the rolling deformation of process 1 gradually increases from 44% to 66%， the tubes’ martensitic matrix transforms into fine ferritic matrix， the yield strength（σy） increases from 302 MPa to 407 MPa， the elongation（El） decreases from 28.6% to 25.8%， and the tensile strength（σU） remains basically unchanged. The matrix microstructure of process 2 （deformation amount 53%-57%） tubes also undergoes the transformation from martensite to ferrite， but due to the relatively small deformation amount， complete recrystallization is delayed， and σy decreases from 487 MPa to 364 MPa， and El increases from 23.9% to 36.3%. The tubes of two processes are subjected to the same forward and tempering treatments after final rolling with 44% and 66% deformation respectively. The microstructure of the finished tubes shows that carbide particles are evenly distributed on the matrix of lath martensite， and their mechanical properties at room temperature are equivalent（σy=590-597 MPa，σU=810-817 MPa，El=20.7%-22.8%）. However， the high-temperature mechanical properties of the finished tubes of process 2 （σy=357 MPa，σU=380 MPa，El=16.3%） are slightly lower than that of process 1 （σy=383 MPa，σU=446 MPa，El=21.6%）.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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