Heat Treatment of Weld Part in 15-5 PH Stainless Steel and Manufacturing of Actual Hydrofoil for a High Speed Passenger Craft

• Published in: ISIJ International 1998/08/15, Vol.38(8), pp.866-874
• Main Authors: Fujita, Akitsugu, Kawano, Takayuki, Sueoka, Hidetoshi, Sakai, Fumikazu
• Format: Article
• Language: English
• Subjects: 15-5 PH stainless steel; Applied sciences; deformation; Exact sciences and technology; heat treatment; high-speed passenger crafts; hydrofoils; Joining, thermal cutting: metallurgical aspects; mechanical properties; Metals. Metallurgy; phase transformation; welded assembly; Welding
• ISSN: 0915-1559; 1347-5460
• DOI: 10.2355/isijinternational.38.866

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.