Complex Precipitates of TiN-MCx in GCr15 Bearing Steel

Version 1 : Received: 23 May 2019 / Approved: 24 May 2019 / Online: 24 May 2019 (08:46:40 CEST)
Version 2 : Received: 25 May 2019 / Approved: 28 May 2019 / Online: 28 May 2019 (11:06:35 CEST)

A peer-reviewed article of this Preprint also exists.

Tian, Q.; Wang, G.; Yuan, X.; Wang, Q.; Sridhar, S. Complex Precipitates of TiN-MC_x in GCr15 Bearing Steel. Metals 2019, 9, 641. Tian, Q.; Wang, G.; Yuan, X.; Wang, Q.; Sridhar, S. Complex Precipitates of TiN-MCx in GCr15 Bearing Steel. Metals 2019, 9, 641.

Abstract

Nitride and carbide are the second phases which play an important role in the performance of bearing steel, and their precipitation behavior is complicated. In this study, TiN-MC_x precipitations in GCr15 bearing steels were obtained by non-aqueous electrolysis, and their precipitation mechanisms were studied. TiN is the effective heterogeneous nucleation site for Fe₇C₃ and Fe₃C, therefore, MC_x can precipitate on the surface of TiN easily, its chemistry component consists of M₃C and M₇C₃ (M = Fe, Cr, Mn) and Cr₃C₂. TiN-MC_x with high TiN volume fraction, TiN forms in early stage of solidification, and MC_x precipitates on TiN surface after TiN engulfed by the solidification advancing front. TiN-MC_x with low TiN volume fraction, TiN and MC_x form in late stage of solidification, TiN can not grow sufficiently and is covered by a large number of precipitated MC_x particles.

Keywords

non-aqueous electrolysis; TiN-MCx; precipitation; bearings; high carbon chromium bearing steel

Subject

Engineering, Industrial and Manufacturing Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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