Maurice Tutor

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Teaching Since: May 2017
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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 04 Mar 2018 My Price 4.00

harden steel ball bearings

In heat treating to harden steel ball bearings  it is desirable to increase the surface temperature for a short time without significantly warming the interior of the ball. This type of heating can be accomplished by sudden immersion of the ball in a molten salt bath with T∞ = 1300 K and h = 5000 W/m2 ∙ K. Assume that any location within the ball whose temperature exceeds 1000 K will be hardened. Estimate the time required to harden the outer millimeter of a ball of diameter 20 mm, if its initial temperature is 300 K.           

 

 

Answers

Maurice Tutor
(5)
Status NEW Posted 04 Mar 2018 09:03 PM My Price 4.00

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