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- Title
How TEM Projection Artifacts Distort Microstructure Measurements: A Case Study in a 9 pct Cr-Mo-V Steel.
- Authors
Monsegue, Niven; Reynolds, William; Hawk, Jeffrey; Murayama, Mitsuhiro
- Abstract
Morphological data obtained from two-dimensional (2D) and three-dimensional (3D) transmission electron microscopy (TEM) observations were compared to assess the effects of TEM projection errors for submicron-size precipitates. The microstructure consisted of MC carbides in a 9 pct Cr-Mo-V heat resistant steel before and after exposure to creep conditions. Measurements obtained from about 800 carbides demonstrate that particle size and spacing estimates made from 2D observations overestimate the more accurate values obtained from 3D reconstructions. The 3D analysis also revealed the MC precipitates lengthen anisotropically along lath boundary planes, suggesting that coarsening during the early stage of creep in this alloy system is governed by grain boundary diffusion.
- Subjects
TRANSMISSION electron microscopy; VANADIUM steel; MICROSTRUCTURE; HEAT resistant steel; KIRKENDALL effect; CARBIDES
- Publication
Metallurgical & Materials Transactions. Part A, 2014, Vol 45, Issue 9, p3708
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-014-2331-0