Friction surfaced tool steel (H13) coatings on low carbon steel: A study on the effects of process parameters on coating characteristics and integrity

Tool steel H13 was friction surfaced on low carbon steel substrates. Mechtrode (consumable rod) rotational speed and substrate traverse speed were varied, keeping the axial force constant. The effects of process parameters on coating characteristics and integrity were evaluated. A process parameter window was developed for satisfactory deposition of tool steel coatings. Coating microstructures were examined using optical microscopy, scanning electron microscopy, and transmission electron microscopy. Microhardness tests, shear tests, and bend tests were conducted on coatings. The results show that coating width is a strong function of mechtrode rotational speed, while coating thickness is mainly dependent on substrate traverse speed. Lower mechtrode rotational speeds results in wider coatings, while higher substrate traverse speeds produce thinner coatings. Thinner coatings exhibit higher bond strength than thicker coatings. Coatings show no carbide particles, yet exhibit excellent hardness (above 600 HV) in as-deposited condition due to their martensitic microstructure.

[1]  H. K. Rafi,et al.  Microstructure and Properties of Friction Surfaced Stainless Steel and Tool Steel Coatings , 2010 .

[2]  Andrew W. Batchelor,et al.  Study of the interfacial phenomena during friction surfacing of mild steel with tool steel and inconel , 1998 .

[3]  Andrew W. Batchelor,et al.  Friction surfacing of metal coatings on steel and aluminum substrate , 1997 .

[4]  V. I. Vitanov,et al.  Decision support system to optimise the Frictec (friction surfacing) process , 2000 .

[5]  Ivan Voutchkov,et al.  On the thermo-mechanical events during friction surfacing of high speed steels , 2001 .

[6]  G. Madhusudhan Reddy,et al.  Friction surfacing: novel technique for metal matrix composite coating on aluminium–silicon alloy , 2009 .

[7]  Y. Nakayama.  Introduction to fluid mechanics , 1997 .

[8]  Yue Zhang,et al.  Transferring mechanism of the coating rod in friction surfacing , 2008 .

[9]  V. I. Vitanov,et al.  Process parameters selection for friction surfacing applications using intelligent decision support , 2005 .

[10]  L. Svensson,et al.  The austenite grain structure of low-alloy steel weld deposits , 1986 .

[11]  Hoseon Yoo.  Analytical solutions to the unsteady close-contact melting on a flat plate , 2000 .

[12]  Xuemei Liu,et al.  Finite difference modeling on the temperature field of consumable-rod in friction surfacing , 2009 .

[13]  Andrew W. Batchelor,et al.  Study of the interfacial phenomena during friction surfacing of aluminium with steels , 1997 .

[14]  V. I. Vitanov,et al.  An integrated approach to friction surfacing process optimisation , 2001 .

[15]  R. Weck.  Review Lecture - The need for new welding processes , 1977, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[16]  A. S. Rao,et al.  Microstructural aspects of plasma transferred arc surfaced Ni-based hardfacing alloy , 2007 .

[17]  M. Maalekian,et al.  Friction welding – critical assessment of literature , 2007 .

[18]  Microstructure and properties of the TiC/Fe-based alloy hardfacing layers , 2005 .