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In this paper, the microstructure, microtexture and macrotexture of DC04 deep drawing automobile steel in different process states are studied, transverse and longitudinal yield strength, tensile property, percentage elongation after fracture, n value and r value as well as which in direction of 45° of the test steel with thickness of 0.6~2.0 mm are with statistical analysis. The results indicated that the fluctuation of transverse and longitudinal tensile property, n value and r value and which in direction of 45° of the test steel with thickness of 0.6~1.0 mm was great as well as proportion of cracked parts was 79.7%; the stability of such properties as transverse and longitudinal tensile property, n value and r value and which in direction of 45° of the test steel with thickness of 1.2~2.0 mm was improved as well as proportion of cracked parts was 20.3%. The microstructure of as-hot-rolled test steel is mainly equiaxed crystal ferrite, surface layer is with deformation textures {001}<110>, {112}<110> and {554}<225>, subsurface layer is with deformation texture {111}<112> as well as the core is mainly with rotating cubic texture {001}<110>; the microstructure of acid-rolled test steel is mainly fibrous ferrite, main textures are α texture {112}<110>, γ texture {111}<110> and λ texture {001}<110>; the microstructure of annealed test steel and finished product is mainly recrystallized ferrite, annealed test steel is composed of stronger γ texture ({111}<112> and {111}<110>) and α texture, finished product is mainly composed of γ texture {111}<112>. The macrotexture of test steel with good formability is γ texture ({111}<110> and {111}<112>) as well as intensity is around 10; the macrotexture of test steel with poorer formability is mainly {100}<011> and {112}<110>, intensities are 9.00 and 8.54 respectively as well as proportion of macrotexture {111}<110> favorable to deep drawing is smaller.
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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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