求翻译：碳含量一定时，热处理使组织均匀化对铁铜合金的硬度的影响特点是：铸态的硬度较高，正火后硬度会降低，调质后硬度比正火低，退火后硬度最低；而对于冲击韧性，铸态较低，正火后有所升高，调质后又有所上升，退火后冲击韧性最高；是什么意思？

Certain carbon content, heat treatment enables organizations to influence the characteristics of the homogenization of the hardness of the iron and copper alloy: cast of high hardness, the hardness after normalizing will reduce the hardness after quenching and normalizing low minimum hardness after

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When carbon content certain, the heat treatment causes the organization uniformization to the hard copper alloy degree of hardness influence characteristic is: Cast condition degree of hardness is high, after the fire degree of hardness can reduce, after the quenching and tempering the solidity rati

Carbon content must Shi, heat treatment makes organization uniform of on iron copper alloy of hardness of effects features is: casting State of hardness higher, are fire Hou hardness will reduced, adjustable mass Hou hardness than are fire low, annealing Hou hardness minimum; and for shock toughness

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