Primary ferrite nucleation by Oxide+TiN to improve corrosion resistance and mechanical properties of duplex stainless steel weld

• Project/Area Number: 24K17531
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: Osaka University
• Principal Investigator: HOU YUYANG 大阪大学, 接合科学研究所, 助教 (60905933)
• Project Period (FY): 2024-04-01 – 2026-03-31
• Project Status: Granted (Fiscal Year 2024)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2025: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2024: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: Duplex stainless steel / Nucleation / weld microstructure / corrosion resistance / mechanical property

Outline of Research at the Start

Excellent resistance to corrosion and outstanding mechanical properties in the weld metal of duplex stainless steel (DSS) is the continuous pursuit for the key and environmental applications. While the columnar primary ferrite brings out coarse weld microstructure and has deteriorated the above-mentioned performance. Primary ferrite nucleation by Oxide+TiN will be applied to balance the austenite content and refine the weld microstructure of DSS. Through this research to achieve high corrosion resistance and improved mechanical properties (toughness and tensile property) of DSS weld metal.