ASME
Seminar
Metal Improvement With Shot Peening
David Massie of
the Metal Improvement Co. Inc.,
Inc. gave our Section a seminar on shot peening on June 13, 2003.
Shot peening
produces compressive stresses on the outside surfaces of metal parts.
This prevents
crack propagation, stress corrosion cracking, and can improve austempered
ductile iron (ADI) sufficiently to replace steel forgings with ADI.
Improvement in
fatigue life is spectacular. Resistance
to hydrogen sulfide stress cracking, was
increased up to and greater than 2400% in one case study.
Other cases produced improvements
of 75% or much more. Careful process control is needed to get the desired
results. Improper peening can introduce cracks.
Shot peening is
extensively used to improve parts in many industries.
It is used in combination with a
variety of surface treatments. It is used to compensate for residual stresses
caused by welding, forming, and casting, etc. It is also used to form sheet
metal parts.
Before he
retired, Bill Koenecke was Chief Engineer of the Metal Improvement Co.
He designed process systems for them. Bill gave considerable service
to our Section.
He was in an
automobile accident last March, and continues to suffer.
Let us hope for
his complete recovery.
For those who
missed the seminar, a comprehensive manual or a CD may be obtained
by calling 201- 843-7800, or E-mail: Info@metalimprovement.com.
Submitted by Sid
Goodman
