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Microstructural features of plasma nitrided molybdenum alloy steel

Conference Paper


Abstract


  • This research is part of a larger project to investigate the wear and friction of the centre bearing of a rail freight truck. Existing centre bearing surfaces include flame hardened AISI 1030 steel and AISI 1053 cast steel top centres mating against un-greased and/or greased Hadfield steel centre bowl liners, and polyethylene centre bowl liners. The wear life of the unlubricated steels against Hadfield steel is short, greasing the bearings is costly, and industry reports some failures of polyethylene centre bowl liners due to excessive plastic flow and cracking of the rim wall. The present research investigates the materials characterisation of plasma nitrided AISI 4016 molybdenum alloy steel that could be used as an alternative centre bearing surface. The quench and tempered AISI 4016 steel samples were plasma nitrided at 450, 500, 550 and 580°C using 75% N2: 25% H2 mixture gas for 5 hours. The microstructures of the coatings were determined using optical microscopy, and scanning electron microscopy. The treated samples were characterised using x-ray diffraction and microhardness. The optimum condition for this material was achieved at the temperature of 500°C.

Publication Date


  • 2007

Citation


  • Franklin, M. J., Huang, S. W., Chandra, T., & Tieu, K. (2007). Microstructural features of plasma nitrided molybdenum alloy steel. In Materials Science Forum Vol. 539-543 (pp. 1282-1287). doi:10.4028/0-87849-428-6.1282

Scopus Eid


  • 2-s2.0-38349045313

Web Of Science Accession Number


Start Page


  • 1282

End Page


  • 1287

Volume


  • 539-543

Issue


  • PART 2

Abstract


  • This research is part of a larger project to investigate the wear and friction of the centre bearing of a rail freight truck. Existing centre bearing surfaces include flame hardened AISI 1030 steel and AISI 1053 cast steel top centres mating against un-greased and/or greased Hadfield steel centre bowl liners, and polyethylene centre bowl liners. The wear life of the unlubricated steels against Hadfield steel is short, greasing the bearings is costly, and industry reports some failures of polyethylene centre bowl liners due to excessive plastic flow and cracking of the rim wall. The present research investigates the materials characterisation of plasma nitrided AISI 4016 molybdenum alloy steel that could be used as an alternative centre bearing surface. The quench and tempered AISI 4016 steel samples were plasma nitrided at 450, 500, 550 and 580°C using 75% N2: 25% H2 mixture gas for 5 hours. The microstructures of the coatings were determined using optical microscopy, and scanning electron microscopy. The treated samples were characterised using x-ray diffraction and microhardness. The optimum condition for this material was achieved at the temperature of 500°C.

Publication Date


  • 2007

Citation


  • Franklin, M. J., Huang, S. W., Chandra, T., & Tieu, K. (2007). Microstructural features of plasma nitrided molybdenum alloy steel. In Materials Science Forum Vol. 539-543 (pp. 1282-1287). doi:10.4028/0-87849-428-6.1282

Scopus Eid


  • 2-s2.0-38349045313

Web Of Science Accession Number


Start Page


  • 1282

End Page


  • 1287

Volume


  • 539-543

Issue


  • PART 2