Does heat treat effect the stiffness of 4140 type material?

[homebrewdude]

I am trying to calculate the deflections when a 4140 bar is loaded.

Do the properties change when it is heat treated to around 35 Rc?

I am guessing I would adjust the Youngs Modulus.

any suggestions?

 

[israelkk]

No, for al practical uses the young modulus does not change therefore the stiffness does not change.

 

[metengr]

Young's Modulus will not change with heat treatment. Other mechanical properties like ultimate tensile, yield strength and ductility (% elongation) will change with corresponding heat treatment.

I would use the standard beam formula to determine deflection. In general, the geometry of the beam (cross section) will have the greatest affect on deflection.

 

[EdStainless]

No, there shouldn't be a noticable change.
Some alloys, like the PH grades do change modulus when aged, but not this type of material.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

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