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 4113| 17
 
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调质层的厚度怎么计算? | 
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 点评
既然硬度提高了,那么组织是发生变化了的 
 
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 热处理之家,我爱我家 
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 点评
谢谢马老夸奖。对40Cr和45钢、球铁比较熟悉,其他材质接触不多。 
 
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