Improved Creep Property of Super304H Steel with Minute Amounts of TiC/TiB2 Nano-Particles at 600 °C and 330 MPa

• Published in: Metals and materials international Vol. 30; no. 7; pp. 1805 - 1816
• Main Authors: Liu, Xingyu, Han, Ying, Duan, Zhenxin, Zu, Guoqing, Qiu, Feng, Zhu, Weiwei, Ran, Xu
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 2024; Springer Nature B.V
• Subjects: Austenitic stainless steels; Characterization and Evaluation of Materials; Chemistry and Materials Science; Copper; Creep life; Creep rate; Creep strength; Engineering Thermodynamics; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Nanoparticles; Phases; Precipitation hardening; Processes; Solid Mechanics; Titanium carbide; Titanium diboride; Nano-sized Ceramic Particles; Creep behavior; Precipitation; Stainless steel
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-023-01605-5

Super304H steel, imbued with trace amounts of TiC/TiB 2 nano-particles, was fabricated to assess the influence of nano-particles on its creep properties under the condition of 600 °C/330 MPa. Our findings elucidate that the inclusion of trace TiC/TiB 2 led to a 21% improvement in the creep life of Super304H steel, while diminishing the creep rate from 6.6 × 10 −5 h −1 to 5.7 × 10 −5 h −1 . The synergistic precipitation strengthening of the nano-scale Cu-rich phases, needle-like M 23 C 6 phases, and NbN phases was primarily responsible for this exceptional creep resistance. During the long-term creep process, the nano-scale Cu-rich phase was very stable with little change. In the Super304H steel, M 23 C 6 and NbN phases had a non-coherent interface and an orientation relationship of 001 NbN // 001 M 23 C 6 . M 23 C 6 and NbN phases in the Super304H steel incorporating minute TiC/TiB 2 nano-particles also had a non-coherent interface but a 1 - 10 NbN // 2 - 33 M 23 C 6 orientation relationship. The M 23 C 6 and NbN phases effectively impede the dislocation movement and were shown to increase the creep strength considerably. Graphical abstract