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41.需要检验非金属夹杂物的钢种是很多的,有高碳钢、中碳钢,也有低碳钢.它们的处理状态不同,会造成硬度上的很大差别.磨抛时,一般硬基体上的夹杂物不易产生拖尾、剥落.如果仅对来样做夹杂物分析时,试样最好先经淬火处理,使基体的硬度增加并使其均匀一致,这样有利于夹杂物的检验和评定.42.对轧制钢材或锻钢件进行非金属夹杂物检验时,应取钢材的纵剖面.因为,易变形的非金属夹杂总是沿钢材变形方向伸长,即使脆性夹杂物也均沿变形方向排列,所以取纵剖面进行夹杂物的鉴定和评级,具有代表性.如果不考虑
41. Need to test the non-metallic inclusions of steel is very large, there are high-carbon steel, medium carbon steel, there are low-carbon steel.They are different processing conditions, will cause a great difference in hardness. Inclusion of the substrate is not easy to produce tailings, spalling.If only to do sample analysis of inclusions, the sample is best quenched first, so that the hardness of the matrix increases and make it uniform, which is conducive to the inspection of inclusions And assessment.42 When testing non-metallic inclusions in rolled or forged steel, the longitudinal section of the steel is to be taken because the non-metallic inclusions that are easily deformable are always elongated in the direction of the deformation of the steel, and even brittle inclusions Are arranged along the deformation direction, so take the vertical section of inclusions identification and rating, representative .If not