dc.contributor.advisor | Harimkar, Sandip P. | |
dc.contributor.author | Dekhane, Aditya Deepak | |
dc.date.accessioned | 2014-09-24T14:18:28Z | |
dc.date.available | 2014-09-24T14:18:28Z | |
dc.date.issued | 2013-07-01 | |
dc.identifier.uri | https://hdl.handle.net/11244/11151 | |
dc.description.abstract | Ferritic-martensitic (FM) steels are well known for the combination of properties such as high strength and good ductility. Modified 9Cr-1Mo is a popular FM steel widely used as a high temperature (250- 400?C) tubing material in power generation industry. This modified 9Cr-1Mo steel can be effectively used as a material for rings and races of hybrid bearings operating at 350-500?C. Refining the grain size to nanometer scale substantially improves the mechanical properties of steel. The nanostructured modified 9Cr-1Mo steel is expected to retain high hardness and wear resistance at elevated temperatures. In this work nanostructured modified 9Cr-1Mo steel is processed by spark plasma sintering of nanocrystalline steel powder. The nanocrystalline powder is produced by ball milling of as-received modified 9Cr-1Mo steel plate. A detailed x-ray diffraction analysis of a ball milled powder is performed to measure the crystallite size. The powder is spark plasma sintered at 500?C, 800?C and 1100?C for 5 min and 10 min holding time.The relative density more than 97% and the grain size < 1 μm are observed for the samples sintered at 800 and 1100?C temperature. An increase of about 200% in microhardness is achieved for the sample sintered at 1100?C as compared to the as-received modified 9Cr-1Mo steel plate. A systematic wear analysis of the sintered samples and as-received plate is performed with alumina and silicon nitride balls. A detailed microscopic analysis of the wear mechanisms is performed. The order of magnitude lower wear rate is observed in the samples sintered at 800 and 1100?C as compared to as-received plate. The improvement in wear behavior can be attributed to the reduction in grain size of the sintered samples. | |
dc.format | application/pdf | |
dc.language | en_US | |
dc.publisher | Oklahoma State University | |
dc.rights | Copyright is held by the author who has granted the Oklahoma State University Library the non-exclusive right to share this material in its institutional repository. Contact Digital Library Services at lib-dls@okstate.edu or 405-744-9161 for the permission policy on the use, reproduction or distribution of this material. | |
dc.title | Wear Behavior of Spark Plasma Sintered Nanostructured Modified 9Cr-1Mo Steel | |
dc.type | text | |
dc.contributor.committeeMember | Kalkan, Kaan | |
dc.contributor.committeeMember | Singh, Raman P. | |
osu.filename | Dekhane_okstate_0664M_12960.pdf | |
osu.accesstype | Open Access | |
dc.description.department | Mechanical Engineering | |
dc.type.genre | Thesis | |