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Home Georgian Technologies Wear Resistant Products with Enduring Operational Life

Wear Resistant Products with Enduring Operational Life

Description

Short operational life of wear resistant products has been global problem for over 50 years.

Operational life of wear resistant cast products from foundry steels (e.g. a protective casing of a ball mill and spheres for milling, grinding plates, cheeks and plates of crushers, crown for dipper teeth, wheel bandages, etc.) is 4 – 12 months (for some articles 3 – 5 months) and then they break because of strong abrasion and cracking. Strong abrasion and cracking can be explained by unsatisfactory resistibility to friction and impact - dynamic forcing. Additionally, rejection of these products, due to unsatisfactory hardness and impact strength frequently makes up to 10 % of the total production.

At present opportunities of increase properties of metal alloys by using of traditional alloying and modification methods have practically exhausted themselves. Using in these processes refractory oxide, nitride or carbon - nitride nanomaterials, which are characterized by high sedimentation stability at a level of dislocation structures, enables useful increasing of mechanical and technological properties of products.

New technology of dispersion strengthening of austenitic manganese alloy (so–called Hadfield Steel) by using the nano - Al2O3 and vanadium has been developed. The sizes of nanoparticles were in the range of 30 – 90 nm. The investigations were carried out in 10 – kg and 50 – kg induction furnaces.

Innovative Aspect and Main Advantages

The main technical advantage of the proposal is that presented technology provides manufacturing of nanooxide structural steel by additive of nanomaterial directly in liquid metal, in particular, in casting ladle. Also proposed method is very simple and does not need purchase of the expensive equipment.

In comparison with the prototype – Hadfield Steel, the developed technology provides the increase in the strength and the plastic, and impact properties of the alloy up to 40%, while the increase in the strength does not reduce the plasticity of the alloy. The wear resistance increases by 25 %. The received results will allow increasing of products operational life at least 1.5 times.

Areas of Application

Mining; railways; cement works and construction industries.

Crown for dipper teeth
Fig. 1 Crown for dipper teeth: a) moulding; b) complete product.

Stage of Development

Development phase - laboratory tested; the analysis of technical feasibility is being carried out; Georgian patent application has been submitted.

Contact Details

F.Tavadze Institute of Metallurgy and Materials Science
15, Al Kazbegi 0160 Tbilisi, Georgia
Contact person: Anatol Oakley
Tel.: (+995 32) 37 9945
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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