One steel containing 0.6 wt pct C, 0,78 wt pct Mn, and 0.32 wt pct Cr was austenitized at 840 °C for 1 hour and cooled at two rates. Microstructural evaluation by light optical and scanning electron metallography showed a change in the pearlite microstructure. Cooling in air as compared to furnace cooling reduced the pearlite interlamellar spacing and increased the hardness. The slower cooling resulted in a lower tensile strength, higher tensile elongation, and a different fracture appearance.

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