Tribological Performance Improvement of Bearing Steel GCr15 by an Alternating Magnetic Treatment

doi:10.1007/s40195-017-0587-2

Abstract

Abstract:

This paper discusses the tribological performance of the bearing steel GCr15 treated by an alternating magnetic field. The wear test results showed that the average of wear mass losses decreased by nearly 80% after the magnetic treatment, compared to those before the magnetic treatment. The micro-hardness and microstructures (i.e., grain size, carbide morphology and dislocation distribution) before and after the magnetic treatment were experimentally investigated, and the mechanism of the tribological performance improvement of the bearing steel GCr15 due to the magnetic treatment was then revealed based on the above results.

Key words: Tribological performance, Magnetic treatment, Bearing steel

Yan-Li Song, Cheng Yu, Xia Miao, Xing-Hui Han, Dong-Sheng Qian, Xu Chen. Tribological Performance Improvement of Bearing Steel GCr15 by an Alternating Magnetic Treatment[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(10): 957-964.

Figures/Tables 14

Fig. 1 Uniaxial compressive tests performed on GCr15 steel

Fig. 2 Hysteresis loop of GCr15 steel [21]

Fig. 3 Photographs of samples before and after wearing tests: a before and b after treatments

Table 1 Results of wear tests

Group no.	Before treatment		After treatment
Group no.	1	2	3	4
Time (min)	480	400	480	400
Mass before wear (g)	6.5280	6.5330	6.5079	6.5263
Mass after wear (g)	6.4458	6.5116	6.4938	6.5196
Wear mass loss (g)	0.0822	0.0214	0.0141	0.0067
Average of wear mass loss (g)	0.0518	0.0104

Fig. 4 Measured friction coefficients before and after the magnetic treatments

Fig. 5 Average and standard deviation of the friction coefficients

Fig. 6 Micro-Vickers-hardness of GCr15 before and after the magnetic treatments

Fig. 7 Metallographic images of GCr15 before a and after b the magnetic treatments

Fig. 8 Carbide distribution of GCr15 before and after the magnetic treatment: a before treatment; b after treatment

Fig. 9 Carbide size of GCr15 before and after the magnetic treatments

Fig. 10 Process of carbide particle refinement under the action of a magnetic field: a the initial state, b the intermediate state and c the final state

Fig. 11 Dislocation structures before a and after b the magnetic treatments

Fig. 12 Mechanism of Frank-Read dislocation multiplication [27]

Fig. 13 Cellular sub-grain structure after magnetic treatment

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