Distribution of Boron in 9.5Cr–1.5MoCoVNbNB Martensitic Heat-Resistant Steel Studied by Secondary Ion Mass Spectroscopy and atom Probe Tomography

9.5Cr–1.5MoCoVNbNB heat-resistant steel has been designed for use at 620 ℃ in ultra-supercritical power plants and has been acknowledged as the most promising martensitic heat-resistant steel for turbine rotors. With the addition of 100 ppm B, the resulting precipitates and inclusions endow the stee...

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Bibliographic Details
Published in:Metals and materials international 2024, 30(4), , pp.990-1001
Main Authors: Yin, Huifang, Zhao, Jiqing, Bao, Hansheng, Ge, Wenqing, Yin, Fengshi, Hu, Ri, Jia, Hongshuai
Format: Article
Language:English
Subjects:
Alloying elements
Carbides
Characterization and Evaluation of Materials
Chemistry and Materials Science
Dimpling
Engineering Thermodynamics
Heat and Mass Transfer
Heat resistant steels
Inclusions
Machines
Magnetic Materials
Magnetism
Manufacturing
Martensitic stainless steels
Materials Science
Metallic Materials
Power plants
Precipitates
Processes
Secondary ion mass spectroscopy
Solid Mechanics
Spectrum analysis
Tomography
Turbines
재료공학
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Summary:9.5Cr–1.5MoCoVNbNB heat-resistant steel has been designed for use at 620 ℃ in ultra-supercritical power plants and has been acknowledged as the most promising martensitic heat-resistant steel for turbine rotors. With the addition of 100 ppm B, the resulting precipitates and inclusions endow the steel with improved properties. However, the direct observation and quantitative analysis of B distribution in 9.5Cr–1.5MoCoVNbNB heat-resistant steel are lacking. Herein, the distribution of B in 9.5Cr–1.5MoCoVNbNB heat-resistant steel was analyzed. The results of secondary ion mass spectroscopy (SIMS) revealed that B segregated at the boundaries after tempering, and those of atom probe tomography (APT) revealed that B atoms were evenly distributed in M 23 C 6 carbide particles during aging at 620 ℃. The coarsening of M 23 C 6 carbides was found to be a process of alloy element redistribution. The BN inclusions might be detrimental during the tensile rupture fracture because the fish-eye fracture mode was observed. Cavity coalescence mainly occurs around type-B dimples (without BN particles). Graphical Abstract
ISSN:1598-9623
2005-4149
DOI:10.1007/s12540-023-01563-y