Puli Wang , Jinyao Ma , Peizhi Cui , Tong Wang , Nan Dong , Peide Han
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Enhancement of intergranular corrosion resistance of Super304H by a two-step gradient cooling strategy
Niobium (Nb) addition could enhance the thermal stability of Super304H through the formation of Nb(C, N) precipitates. This study proposes an innovative two-step gradient cooling strategy that promotes dispersed Fe, Cr, Ni-round Nb(C, N) re-precipitation in the matrix. Through the strategy, the deleterious precipitation of M23C6 at grain boundaries (GBs) is significantly inhibited compared to the solution-treated Super304H during 650 °C isothermal aging. The distribution and element optimized Nb(C, N) through the strategy is of great significance for improving the thermal stability and intergranular corrosion (IGC) resistance of Super304H during service.
期刊介绍：
Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review.
Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials.
Contributions include, but are not limited to, a variety of topics such as:
• Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors
• Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart
• Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction
• Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots.
• Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing.
• Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic
• Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive
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