Study of the Microstructural Evolution of Tempered Martensite Ferritic Steel T91 upon Ultrasonic Nanocrystalline Surface Modifiction
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In this work, various electron microscopy and analysis techniques were used to investigate the microstructural evolution of a 9% Cr tempered martensite ferritic (TMF) steel T91 upon ultrasonic nanocrystalline surface modification (UNSM) treatment. The micro-dimpled surface was analyzed by scanning electron microscopy. The characteristics of plastic deformation and gradient microstructure of the UNSM treated specimens were clearly revealed by crystal orientation mapping of electron backscatter diffraction (EBSD), with flexible use of the inverse pole figure, image quality, and grain boundary misorientation images. Transmission electron microscope (TEM) observation of the specimens at different depths showed the formation of dislocations, dense dislocation walls, subgrains, and grains in the lower, middle, upper, and top layers of the treated specimens. Refinement of the M23C6 precipitates was also observed, the size and the number density of which were found to decrease as depth from the top surface decreased. The complex microstructure and microstructural evolution of the TMF steel samples upon the UNSM treatment were well-characterized by combined use of EBSD and TEM techniques.
Abstract
In this work, various electron microscopy and analysis techniques were used to investigate the microstructural evolution of a 9% Cr tempered martensite ferritic (TMF) steel T91 upon ultrasonic nanocrystalline surface modification (UNSM) treatment. The micro-dimpled surface was analyzed by scanning electron microscopy. The characteristics of plastic deformation and gradient microstructure of the UNSM treated specimens were clearly revealed by crystal orientation mapping of electron backscatter diffraction (EBSD), with flexible use of the inverse pole figure, image quality, and grain boundary misorientation images. Transmission electron microscope (TEM) observation of the specimens at different depths showed the formation of dislocations, dense dislocation walls, subgrains, and grains in the lower, middle, upper, and top layers of the treated specimens. Refinement of the M23C6 precipitates was also observed, the size and the number density of which were found to decrease as depth from the top surface decreased. The complex microstructure and microstructural evolution of the TMF steel samples upon the UNSM treatment were well-characterized by combined use of EBSD and TEM techniques.
참고문헌 (20)
- Ahn D, "Effect of ultrasonic nano-crystalline surface modification on the microstructural evolution and mechanical properties of Al5052 alloy", Surf. Interface Anal, 44, pp.1415~1417 (2012)
- Amanov A, "Microdimpled surface by ultrasonic nanocrystal surface modification and its tribological effects", Wear, 286-287, pp.136~144 (2012)
- Chen Y, "Corrosion behavior of ferriticmartensitic steel T91 in supercritical water", Corros. Sci, 48, pp.2843~2854 (2006)
- Cherif A, "Effects of ultrasonic nanocrystal surface modification (UNSM) on residual stress state and fatigue strength of AISI 304", J. Mater. Eng. Perform, 19, pp.282~286 (2010)
- He Y, "Microstructural evolution of X20CrMoV12.1 steel upon long-term on-site exposure in power plants", Adv. Sci. Lett, 4, pp.1416~1423 (2011)
- He Y, "Characterization of the nano-scale surface layer of a tempered martensitic steel synthesized by ultrasonic nanocrystalline surface modification treatment", Sci. Adv. Mater, 6, pp.2260~2268 (2014)
- Lu S, "Strain-induced microstructure refinement in a tool steel subjected to surface mechanical attrition treatment", J. Mater. Sci. Technol, 26, pp.258~263 (2010)
- Morito S, "The morphology and crystallography of lath martensite in alloy steels", Acta Mater, 54, pp.5323~5331 (2006)
- Panait C G, "Evolution of dislocation density, size of subgrains and MX-type precipitates in a P91 steel during creep and during thermal ageing at 600oC for more than 100,000 h", Mater. Sci. Eng. A, 527, pp.4062~4069 (2010)
- Payton E J, "On the nature of internal interfaces in a tempered martensite ferritic steel and their evolution during long-term creep", Scripta. Mater, 66, pp.1045~1048 (2012)
- Ren X, "Effect of grain refinement on corrosion of ferritic-martensitic steels in supercritical water environment", Mater. Corros, 61, pp.748~755 (2010)
- Rojas D, "9%Cr heat resistant steels: Alloy design, microstructure evolution and creep response at 650°C", Mater. Sci. Eng. A, 528, pp.5164~5176 (2011)
- Scarlin R B, "Method for the surface treatment of ferritic", martensitic 9-12% Cr steel, 2009
- Shen Y Z, "Precipitate phases of a ferritic", martensitic 9% Cr steel for nuclear power reactors, 2009, pp.239, 648~654
- Tan L, "Effect of shot-peening on the oxidation of alloy 800H exposed to supercritical water and cyclic oxidation", Corros. Sci, 50, pp.2040~2046 (2008)
- Umemoto M, "Formation of nanocrystalline structure in steels by air blast shot peening", Meter. Trans, 44, pp.1488~1493 (2003)
- Wang L M, "Grain size effects on the austenitization process in a nanostructured ferritic steel", Acta Mater, 59, pp.3710~3719 (2011)
- 유대황, "Effect of Ultrasonic and Air Blast Shot Peening on the Microstructural Evolution and Mechanical Properties of SUS304", Journal of the Korean Physical Society, 54(3), pp.1161~1166 (2009), 한국물리학회
- Zhong X Y, "The characteristic of oxide scales on T91 tube after long-term service in an ultra-supercritical coal power plant", J. Supercrit. Fluids, 72, pp.68~77 (2012)
- Zhou L, "Strain-induced refinement in a steel with spheroidal cementite subjected to surface mechanical attrition treatment", Acta Mater, 56, pp.78~87 (2008)