The symmetrical steel/titanium/titanium/steel billet assembly and vacuum hot rolling bonding process were adopted to investigate the effect of rolling reduction ratio on the interfacial microstructure and properties of TA1 commercially pure titanium-EH40 steel composite plates. The micromorphology and element diffusion behavior at the titanium-steel interface were characterized by means of optical microscopy (OM), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Meanwhile, the effect of interfacial microstructure on mechanical properties under different reduction ratios was analyzed. The results showed that the interfacial bonding strength increased significantly with the rise of reduction ratio. When the rolling reduction ratio increased from 3 to 6, the interfacial shear strength and bonding strength increased by 84 MPa and 67 MPa, respectively. The interfacial reaction layers were composed of β -Ti, TiC and FeTi phases under all reduction ratio conditions. With the increase of reduction ratio, the interfacial bonding quality was improved, while the total thickness of the interfacial reaction layer and the thickness of the brittle layer showed a decreasing trend. The reduction of interfacial defects and the thinning of the reaction layer were the microstructural factors responsible for the improvement of interfacial bonding properties.
| 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 |