It is found that significant radial variations of cracking temperature and cracking reaction rate exist due to boundary layer near the inner wall.
但是管内近壁面处由于存在边界层，始终存在着明显的径向温差；近管壁处始终是裂解的高速率区，副反应也主要发生在管壁区。
The results show that the wheel hub cracking during radial impact testing was caused by excessive content of magnesium in the alloy as well as the overheating of the alloy during the solution process.
结果表明 ，轮毂在径向冲击检测时开裂的主要原因是镁含量偏高 ，以及热处理加热温度高造成组织过热所致。
The results show that the wheel hub cracking during radial impact testing was caused by excessive content of magnesium in the alloy as well as the overheating of the alloy during the solution process.
即叶轮断裂是由于锻造加热时温度控制不好导致过热，在随后的淬火工序中又因加热温度过低，组织固溶强化效果差等综合原因所致。
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