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A blacksmith use 0.76 wt. % C steel to produce a knife. He wanted to produce with hardness of 55 HRC and 65 HRC .

A blacksmith use 0.76 wt. % C steel to produce a knife. He wanted to produce with hardness of 55 HRC and 65 HRC . Plot the heat treatment route using the TTT diagram, assuming the cooling start at 80C above eutectoid temperature.

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