Answer :
For a Jominy distance of 12.7 mm and a bar diameter of 38.1 mm, the H coefficient is approximately 5.08.
The H coefficient in Jominy hardenability testing represents the cooling rate at a specific distance from the quenched end of a Jominy test specimen. It is used to assess the hardenability of a material.
The H coefficient is calculated using the formula:
H = (d^2) / (t - d/2)
Where:
H = H coefficient
d = Jominy distance (in this case, 12.7 mm)
t = Bar diameter (in this case, 38.1 mm)
Substituting the given values into the formula, we have:
H = (12.7^2) / (38.1 - 12.7/2)
H = (161.29) / (38.1 - 6.35)
H = 161.29 / 31.75
H ≈ 5.08
Therefore, for a Jominy distance of 12.7 mm and a bar diameter of 38.1 mm, the H coefficient is approximately 5.08.
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