MUMBAI, India, Sept. 22 -- Intellectual Property India has published a patent application (202641097992 A) filed by Mani Pandi A S; Mallika S; and Dr. V S Senthil Kumar on August 13, 2026, for System And Method For Surface Layer Treatment Of Superalloy Substrates To Enhance Near- Surface Mechanical Attributes.
Inventors include Mani Pandi A S; and Dr. V S Senthil Kumar.
The application for the patent was published on September 18, 2026, under issue no. 38/2026.
Abstract: The present invention relates to a solid-state thermo-mechanical surface modification method and system for enhancing near-surface mechanical properties of nickel- based superalloys, particularly Hastelloy C22. The method employs a pinless friction stir tool formed from virgin K20 tungsten carbide and having an 18 mm flat contact tip, mounted on a vertically rotatable CNC spindle inclined at 2.5° relative to a normal axis. The tool is rotated at 900 rpm and plunged to a controlled depth of 0.45–0.48 mm while traversing at 8–10 mm/min under ambient conditions. Frictional heating, severe plastic deformation, and dynamic recrystallization are generated without melting or introducing secondary reinforcement materials, producing a refined, equiaxed surface microstructure. Under optimized processing conditions, the modified Hastelloy C22 surface achieves an ultimate tensile strength of up to 834.26 N/mm² and a yield strength of up to 716.08 N/mm². The invention provides a controlled, unreinforced solid-state route for improving near-surface mechanical performance of superalloy substrates.
Disclaimer: Curated by HT Syndication.
