PSI - Issue 36

Olexandr Ivanov et al. / Procedia Structural Integrity 36 (2022) 223–230 Olexandr Ivanov et al. / Structural Integrity Procedia 00 (2021) 000 – 000

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6

Fig. 5. Experimental calculated temperature dependences of thermal density for experimental electrode material.

A comparison of the calculated and experimental values of the thermal cycle (Fig. 5) shows that they are in good agreement. This gives grounds for expanding the calculated range to values that correspond to the geometry of different working bodies. The calculation of isotherms in the XOZ and XOY planes were performed (Fig. 6).

-10

-8

-6

-4

-2

0

x

10 C 00 º

14 C 00 º

8 C 00 º

6 C 00 º

-0,4

4 C 00 º

-0,8

-1,2

z

200 º C

y

1,5

1,0

0,5

-6

-2

-10

-8

-4

x

0

14 C 00 º

10 C 00 º

800 º C

6 C 00 º

4 C 00 º

-0,5

200 º C

-1,0

Fig. 6. Isotherms for a quasi-stationary temperature field in the XOY and XOZ planes, calculated for surfacing with experimental electrodes.

Analysis of the constructed isotherms, together with the temperature dependences of the change in the phase composition of the coatings of the Fe-Ti-Mo-B- C system, show that the width of the penetration zone is ⁓ 1.0 cm and the depth is ⁓ 0.5 cm. Such geometry of the penetration zone is in accordance with the obtained experimental data and allows to effectively strengthen a wide range of work surfaces, which are operated under conditions of intense abrasive wear, including screws for the manufacture of building ceramics, woodworking tools and others. Microstructure of experimental material (Fig. 7, a) consist of few phases: large (~ 8 μm) grains of regular shape are centered in the eutectic-like areas, which are surrounded with a homogeneous phase. Also, there are smaller grains (~ 1 μm) which are located i nside of a bigger one. Such grains could be identified as a titanium carbide, which are formed at a higher temperatures and are a modifiers for the forming of Fe(Mo, B) 2 grains. According to the XRD-pattern analysis (Fig. 7, b) phases in the structure are as follows: Fe(Mo, B) 2 - is in the form of sufficiently large, faceted and uniformly distributed grains; TiC - occupies the central regions of Fe(Mo, B) 2 grains and is part of eutectic colonies in the form of dispersed inclusions; ferrite - is part of the eutectic (the vast majority) and partly formed around the grains of Fe(Mo, B) 2 ; Fe 2 B almost completely is part of the eutectic and does not occur as a separate structural component.