Hardfacing of metal-cutting tools by arc welding in vacuum

• Autorzy: Ferdinandov N. V. , Gospodinov D. D.

Identyfikatory

DOI

10.5604/01.3001.0014.1775

• Języki publikacji: EN

Abstrakty

EN

Purpose: To present a technology for hardfacing of metal-cutting tools by arc welding in vacuum. Design/methodology/approach: The experiments were carried out using an installation for arc welding in vacuum. Objects of research were metal cutting tools (lathe knives), made of high-speed steel HS6-5-2 on a base metal of structural steel C45. The structure, hardness and wear resistance after hardfacing and after a triple tempering at 560°C have been determined. The heat resistance of the obtained instruments has been examined. Findings: The microstructural analysis showed that the structure of the built-up layer consisted of martensite, retained austenite and carbides. This was confirmed by the values of measured hardness after welding which were about 63-64 HRC. The triple tempering led to an increase in hardness by 3-4 HRC. It was found that the built-up layers (cutting edges of tools) retain their hardness (HRC=63-65) up to a temperature of 615-620°C, which shows that the heat resistance of the build-up layers was similar to that of the hardened and tempered tools of the same steel. The built-up work-pieces (excluding heat treated) and the reference knife showed the same cutting qualities at cutting speeds in the range of 55 to 120 m/min. It has been found that triple tempering after hardfacing led to increased wear resistance and consequently the durability of the tool also increased due to the higher hardness. Practical implications: The practical application is related to the production of metalcutting tools. Originality/value: The proposed technological method allows to produce defects free built-up layers. The cutting properties of the built-up in vacuum layers are comparable to or better than those of new tools made of steel HS 6-5-2.

Słowa kluczowe

EN

tool materials; wear resistance; hardfacing; heat treatment; hollow cathode arc

PL

materiały narzędziowe; odporność na zużycie; napawanie; obróbka cieplna; katoda wnękowa łukowa

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2020
• Tom: Vol. 99, nr 2
• Strony: 49--56
• Opis fizyczny: Bibliogr 27 poz., rys., tab., wykr.

Twórcy

autor

Ferdinandov N. V.

• Department of Material Science and Technology, Faculty of Mechanical and Manufacturing Engineering, University of Ruse, 8 Studentska str., POB 7017, Ruse, Bulgaria

autor

Gospodinov D. D.

• Department of Material Science and Technology, Faculty of Mechanical and Manufacturing Engineering, University of Ruse, 8 Studentska str., POB 7017, Ruse, Bulgaria

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).