Full
Outline
Taking the quenched and tempered Cr-Ni-Mo alloy steel for brake discs of high-speed trains as the research object，the morphology of the secondary phase is observed and the size is measured by transmission electron microscopy，and the secondary phase is identified by energy spectrum analysis and electron diffraction；the principle of full-field strain measurement by geometric phase analysis （GPA） is explained in detail，it is proposed to use the geometric phase analysis to study the matching relationship in a certain direction at the interface between the matrix and the secondary phase through the bicrystal electron diffraction pattern obtained by the Fourier transform of high-resolution transmission electron microscopy （HRTEM） images of the matrix and the secondary phase. The results show that the secondary phase of Cr-Ni-Mo alloy steel used in brake discs for high-speed trains is mainly in the form of rods，and there are a small amount of secondary phase with small size and approximately round shape；the energy spectrum analysis combined and the electron diffraction method shows that the secondary phase with approximately round shape and small size particles is the Mn-containing M23C6 carbides；the strain fields in the x，xy and y directions at the interface between the matrix and the secondary phase M23C6 is obtained by geometric phase analysis，the matching relationship between matrix crystal planes and the secondary phase M23C6 crystal planes is determined to be semi-coherent.
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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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