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ZL-201合金铸件经T4处理后,用单铸试样或铸件上切取试样,测得的机械性能应符合表1的规定。然而在实际生产中,往往因组成ZL-201合金的中间合金(铝铜、铝锰、铝钛)杂质含量过高,而造成铸件在T4状态下强度低于技术条件规定的指标,具体参数见表2。这些铸件即使重复淬火和调整淬火工艺参数都无法使强度再次升高。我们根据T5状态的性能与时效温度(175℃×4h)的关系设想,能否从60～150℃温度区间中找到一个适合的温度,能使强度偏低的铸件经低温时效后,其强度值可升高到规定值
ZL-201 alloy castings after T4 treatment, with a single cast sample or cast on the sample, the measured mechanical properties shall comply with the provisions of Table 1. However, in the actual production, often due to the composition of the ZL-201 alloy (Al-Cu, Al-Mn, Al-Ti) impurity content is too high, resulting in the strength of the casting in the T4 state is lower than the technical conditions of the indicators, the specific parameters Table 2. Even if these castings are quenched and tempered, the strength of the castings can not be raised again. According to the relationship between the performance of T5 state and the aging temperature (175 ℃ × 4h), we can find out whether a proper temperature can be found in the temperature range from 60 ℃ to 150 ℃. After low temperature aging, the strength value Can be raised to the specified value