56
A. V. Taran et al.
Table 3 Tribological properties
№
Sample
Fiction moment, N/m
COF
Width of wear track, mm
1
Initial AISI 430
8.5
0.76
3.75
2
B 4 C 0.5 µm
7
0.62
3.27
3
B 4 C 3.0 µm
8
0.71
3.77
4
Initial AISI D3
6
0.53
1.78
5
B 4 C 0.5 µm
7
0.62
1.64
6
B 4 C 3.0 µm
3.5
0.31
0.45
Table 4 Nanoidentation results
№
AISI 430
AISI D3
B 4 C
E, GPa H, GPa H/E
E, GPa H, GPa H/E
E, GPa H, GPa H/E
1
204.496 3.727
0.018 248.499 9.414
0.038 211.176 14.378 0.068
2
184.049 4.084
0.021 242.637 9.371
0.039 225.678 16.616 0.074
3
203.588 3.872
0.019 259.652 9.436
0.036 233.211 16.643 0.071
4
205.773 3.99
0.019 235.89
8.796
0.037 215.366 15.99
0.074
5
198.272 3.61
0.018 254.216 9.045
0.036 222.788 15.476 0.069
6
202.134 4.559
0.022 238.713 8.919
0.037 218.522 15.837 0.072
7
209.751 3.8
0.018 245.074 9.345
0.038 227.821 16.386 0.072
Average 201.151 4.092
0.02
246.383 9.189
0.037 222.08
15.904 0.071
4 Conclusions
1. A method is proposed for hardening the surface of low- and high-carbon steel
products by B4C coating deposited by the ion-plasma method using a highfrequency plasma source with an external magnetic field.
2. Tribological tests of the coating of boron carbide with a thickness of 0.5 and
3.0 µm on substrates of AISI 430 and AISI D3 steels were carried out. The
influence of the base on the adhesion to the coating is revealed.
3. The optimal parameters were obtained using a B4C coating with a thickness of
3.0 µm deposited on AISI D3 high-carbon steel, which provides higher friction
characteristics, significantly increases the wear resistance of the working surface,
and reduces the wear of the mating part.
4. The physical–mechanical characteristics of the substrate and the hardening
coating are comparatively studied. The nanohardness values were in the range of
14–16.6 GPa. It was found that the B4C coating has 3.89 times higher hardness
than uncoated AISI 430 steel and 1.73 times higher in comparison with bare AISI
D3 steel.
A. V. Taran et al.
Table 3 Tribological properties
№
Sample
Fiction moment, N/m
COF
Width of wear track, mm
1
Initial AISI 430
8.5
0.76
3.75
2
B 4 C 0.5 µm
7
0.62
3.27
3
B 4 C 3.0 µm
8
0.71
3.77
4
Initial AISI D3
6
0.53
1.78
5
B 4 C 0.5 µm
7
0.62
1.64
6
B 4 C 3.0 µm
3.5
0.31
0.45
Table 4 Nanoidentation results
№
AISI 430
AISI D3
B 4 C
E, GPa H, GPa H/E
E, GPa H, GPa H/E
E, GPa H, GPa H/E
1
204.496 3.727
0.018 248.499 9.414
0.038 211.176 14.378 0.068
2
184.049 4.084
0.021 242.637 9.371
0.039 225.678 16.616 0.074
3
203.588 3.872
0.019 259.652 9.436
0.036 233.211 16.643 0.071
4
205.773 3.99
0.019 235.89
8.796
0.037 215.366 15.99
0.074
5
198.272 3.61
0.018 254.216 9.045
0.036 222.788 15.476 0.069
6
202.134 4.559
0.022 238.713 8.919
0.037 218.522 15.837 0.072
7
209.751 3.8
0.018 245.074 9.345
0.038 227.821 16.386 0.072
Average 201.151 4.092
0.02
246.383 9.189
0.037 222.08
15.904 0.071
4 Conclusions
1. A method is proposed for hardening the surface of low- and high-carbon steel
products by B4C coating deposited by the ion-plasma method using a highfrequency plasma source with an external magnetic field.
2. Tribological tests of the coating of boron carbide with a thickness of 0.5 and
3.0 µm on substrates of AISI 430 and AISI D3 steels were carried out. The
influence of the base on the adhesion to the coating is revealed.
3. The optimal parameters were obtained using a B4C coating with a thickness of
3.0 µm deposited on AISI D3 high-carbon steel, which provides higher friction
characteristics, significantly increases the wear resistance of the working surface,
and reduces the wear of the mating part.
4. The physical–mechanical characteristics of the substrate and the hardening
coating are comparatively studied. The nanohardness values were in the range of
14–16.6 GPa. It was found that the B4C coating has 3.89 times higher hardness
than uncoated AISI 430 steel and 1.73 times higher in comparison with bare AISI
D3 steel.