Computation of Residual Stresses due to Phase Transformations during Quenching of Hollow Cylinders.
ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET WEAPONS LAB
Pagination or Media Count:
A previous paper described a method for computing the stresses due to the combined effects of transient temperatures and material phase transformations. The general purpose finite element program ADINATADINA was used to compute both the transient temperatures and the associated stresses. The problem considered was that of an axisymmetric hollow cylinder undergoing a water-spray quench. The present work considers a similar model, but is better able to describe the residual stress state because of the availability of a more accurate set of properties for the material expansion due to the phase transformation. Effects on the transient and residual stresses due to modifications of the material expansion and varying quench rates are discussed. It was found that the stresses due to the transformation are more severe than those due to the transient temperatures alone. Inelastic behavior is found to occur in all the cases considered and high residual stresses can exist on the inner and outer surfaces. While dependent on actual material composition, these residual stresses can lead to queunch cracking. The model describes the rapid quenching of steel gun tubes for the purpose of developing a martensitic grain structure and desired physical properties in the tube.
- Fabrication Metallurgy