Mar aging Steel

[patwalsh]

Hi,
does anyone have experience of MARAGING STEEL shinkage during heat treatment?

I understand that it can shrink approx 0.0004" per inch on external diameters. Does the same apply to internal bores and a linear reduction in the actual measured diameter occur, or is it a case where the cubic volume of the material decrease and the measured diameter of an internal bore would effectively;y increase?

Thanks in advance

 

[Maui]

What specific grade of maraging steel are you referring to? Different grades can have very different heat treated microstructures with corresponding differences in the amount of growth.

Maui

http://www.EngineeringMetallurgy.com

 

[EdStainless]

In general maraging alloys will experience a volumetric changes when annealed, and an opposite change when they are aged.
These are volumetric changes, either all dimensions increase, or all dimensions decrease.



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[Compositepro]

Patwalsh, you have a common misconception that every engineer should have learned to avoid, as it is a critical concept for problem solving. If there is volumetric shrinkage of a material, all dimensions shrink, including holes. There are some special cases where if the outside diameter is constrained, then a hole may get bigger. Constraints will result in internal stresses in the material.