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What is the Vickers hardness of steel after the HPF process?

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What is the Vickers hardness of steel after the HPF process?

(a) 362 Hv

(b) 462 Hv

(c) 562 Hv

(d) 662 Hv

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The above asked question is from Inverse Rate Curves for Steel topic in section Heat treatment of Metals and Alloys of Casting-Forming-Welding II

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The correct answer is (b) 462 Hv

Explanation: The HPF process is a very essential process. The Vickers hardness of the material is found to change after this process is done. The Vickers hardness of steel after HPF process is 462 Hv.

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