求翻译：热处理后的力学性能发生一定变化，同种热处理工艺下，硬度随着碳含量增加而增加；冲击韧性随碳含量的增加高先降低后升高；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？

Occurrence of certain changes in the mechanical properties after heat treatment, the same kind of heat treatment process, the hardness increased with increasing carbon content; impact toughness of high first decreased and then increased with increasing carbon content; carbon content of a certain eve

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After the heat treatment mechanics performance has certain change, under the homogeneous heat treatment craft, degree of hardness increases along with the carbon content increases; The resilience increases after the carbon content raises reduces first elevates; When carbon content certain, the heat

Heat treatment Hou of mechanical performance occurs must changes, same heat treatment technology Xia, hardness as carbon content increased and increased; shock toughness with carbon content of increased high first reduced Hou rise; carbon content must Shi, heat treatment makes organization uniform o