Full
Outline
To enhance the light weighting level of a certain commercial vehicle, AZ80 and AZ80-T6 magnesium alloy wheels are produced using high-strength magnesium alloy as the raw material through forging and heat treatment. During the vehicle road test, the AZ80-T6 magnesium alloy wheels passed the verification, whereas the as-forged AZ80 wheels exhibited cracking and air leakage. Taking the AZ80 magnesium alloy wheels with the shortest failure mileage as an example, a failure analysis is conducted. It is observed that the cracks ran along the rotation direction and are close to the rim edge. Through material physical and chemical inspection such as chemical composition, room temperature mechanical properties, and metallographic scanning, it is found that the wheel forging process is normal. Combining with the simulation analysis of the radial force conditions of the magnesium alloy wheels, it is discovered that the safety factor of the AZ80 magnesium alloy wheels is lower than that of the AZ80-T6 magnesium alloy wheels, and the insufficient strength is the main cause of failure. After replacing the AZ80-T6 state magnesium alloy wheels in the road test, the verification is passed.
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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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