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Quality control of cast brake discs

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Figure 2 shows scheme of specimens from brake discs (with  marks). The metallographic specimen etched in NITAL
Fig. 3. Microsection of specimen number 1, etched in Nital,  magnification 100x, (for not ventilated brake disc)
Figure 9 shows scheme of metallography analysis for  perpendicular samples to working surfaces of brake disc

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