Evaluation of Titanium Carbonitride Particles Using Image Analysis and Assessment of their Impact on Machinability

Abstract:

A car manufacturer makes crankshafts of materials from various suppliers. The steels from individual batches differed in their grinding behaviour, despite being supplied as a single steel grade. Some deliveries were repeatedly associated with much faster wear of grinding wheels than others. Consequently, the ground surfaces of the crankshafts developed visible patterns and, in some cases, surface cracks. The excessive wear in grinding wheels was suspected to be caused by titanium precipitates. The purpose of this investigation was to identify the phases in which titanium is present in the steels, describe the morphology, sizes and distribution of their particles and compare these aspects for materials from the three suppliers. It was found that titanium was present in the form of carbides or carbonitrides, whose morphology, sizes, distributions and quantities of particles varied greatly between the suppliers. These variations were identified as the cause of the differences in grinding behaviour.

• Periodical: Solid State Phenomena (Volume 270)
• Pages: 130-135
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.270.130
• Online since: November 2017
• Authors: Petr Martínek*, Jana Míšková, Peter Sláma
• Keywords: Evaluation of Titanium Carbonitrides, Image Analysis, Machinability

References

[1] J. Cejp, K. Macek, The influence of heat treatment on ductility of micro-alloyed low carbon steels. METAL 2002 - 11th International Conference on Metallurgy and Materials, Tanger s. r. o., Ostrava. (in Czech).

[2] A. Pardo, et al., Influence of Ti, C and N concentration on the intergranular corrosion behaviour of AISI 316Ti and 321 stainless steels, Acta Materialia 55 (2007) 2239–2251.

DOI: 10.1016/j.actamat.2006.11.021

[3] P. Podaný, P. Martínek, Thermomechanical Processing of Micro-alloyed Steel, Materiali in tehnologije/Materials and technology, 48(6). Ljubljana, 2014. p.5 / 855-859. ISSN 1580-2949.

[4] P. Podany, M. Balcar, Properties of low carbon steel with various microalloying additions after particular thermomechanical processing, (2011) Materials Science and Technology Conference and Exhibition 2011, MS and T'11, 1, pp.735-742.

[5] P. Podaný, M. Zemko, M. Balcar, Development of forging technology for microalloyed steel for oil industry, (2010) METAL 2010 - 19th International Conference on Metallurgy and Materials, Conference Proceedings, pp.287-292.

[6] C. Zhou, R. Priestner, The Evolution of Precipitates in Nb-Ti Micro alloyed Steels during Solidification and Post-solidification Cooling. ISIJ International, 1996, Vol. 36, pp.1397-1405.

DOI: 10.2355/isijinternational.36.1397

[7] A. Pandit, Strain induced precipitation of complex carbonitrides in Nb V and Ti V icroalloyed steels, Scripta Materialia, 53 (2005) 11, 1309–1314.

DOI: 10.1016/j.scriptamat.2005.07.003

[8] P. Podaný, P. Martínek, J. Nacházel, M. Balcar, Heat Treatment of Reactor Vessel Steel 08CH18N10T, AIST Steel Properties and Applications Conference Proceedings - Combined with MS and T'12, Materials Science and Technology 2012, Pittsburgh, USA, ISBN 978-1-935117-27-8.