1998 Volume 38 Issue 8 Pages 866-874
Hydrofoils used for high-speed passenger crafts require characteristics such as high strength, high toughness, and high resistance to corrosion. 15-5 PH stainless steel, a precipitation hardening stainless steel, demonstrates such requirements, but welded assembly of the hydrofoil using this material basically requires re-solution treatment after welding. This causes the hydrofoil to show significant deformation, making it difficult to maintain its proper configuration.
The present research work, examines heat treatment conditions intended to inhibit this deformation. The results confirmed that good mechanical properties can be provided to the welded parts and that the impact resistance of the parent material can also be greatly improved by providing solution treatment at a temperature lower than the conventional solution treatment temperature. Furthermore, a heat treatment method to inhibit deformation was elucidated by producing actual hydrofoils on the basis of these fundamental test results, and material testing of the components for the hydrofoil also confirmed that they possess satisfactory characteristics for actual use as hydrofoil material.
