Wear Mechanisms Analysis of Dies Used in the Process of Hot Forging a Valve Made of High Nickel Steel

• Autorzy: Hawryluk M. , Gronostajski Z. , Kaszuba M. , Krawczyk J. , Widomski P. , Ziemba J. , Zwierzchowski M. , Janik M.

Identyfikatory

DOI

10.24425/amm.2018.125131

• Języki publikacji: EN

Abstrakty

EN

The study presents a durability analysis of dies used in the first operation of producing a valve-type forging from high nickel steel assigned to be applied in motor truck engines. The analyzed process of producing exhaust valves is realized in the forward extrusion technology and next through forging in closed dies. It is difficult to master, mainly due to the increased adhesion of the charge material (high nickel steel) to the tool’s substrate. The mean durability of tools made of tool steel W360, subjected to thermal treatment and nitriding, equals about 1000 forgings. In order to perform a thorough analysis, complex investigations were carried out, which included: a macroscopic analysis combined with laser scanning, numerical modelling by FEM, microstructural tests on a scanning electron microscopy and light microscopy (metallographic), as well as hardness tests. The preliminary results showed the presence of traces of abrasive wear, fatigue cracks as well as traces of adhesive wear and plastic deformation on the surface of the dies. Also, the effect of the forging material being stuck to the tool surface was observed, caused by the excessive friction in the forging’s contact with the tool and the presence of intermetallic phases in the nickel-chromium steel. The obtained results demonstrated numerous tool cracks, excessive friction, especially in the area of sectional reduction, as well as sticking of the forging material, which, with insufficient control of the tribological conditions, may be the cause of premature wear of the dies.

Słowa kluczowe

EN

tool wear; tools durability; destructive mechanisms; valve engine; high nickel steel

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2018
• Tom: Vol. 63, iss. 4
• Strony: 1963--1974
• Opis fizyczny: Bibliogr. 28 poz., fot., rys.

Twórcy

autor

Hawryluk M.

• Wroclaw University of Science and Technology, Metal Forming and Metrology, 5 Lukasiewicza Str., 50-371 Wrocław, Poland

autor

Gronostajski Z.

• Wroclaw University of Science and Technology, Metal Forming and Metrology, 5 Lukasiewicza Str., 50-371 Wrocław, Poland

autor

Kaszuba M.

• Wroclaw University of Science and Technology, Metal Forming and Metrology, 5 Lukasiewicza Str., 50-371 Wrocław, Poland

autor

Krawczyk J.

• Wroclaw University of Science and Technology, Metal Forming and Metrology, 5 Lukasiewicza Str., 50-371 Wrocław, Poland

autor

Widomski P.

• Wroclaw University of Science and Technology, Metal Forming and Metrology, 5 Lukasiewicza Str., 50-371 Wrocław, Poland

autor

Ziemba J.

• Wroclaw University of Science and Technology, Metal Forming and Metrology, 5 Lukasiewicza Str., 50-371 Wrocław, Poland

autor

Zwierzchowski M.

• Wroclaw University of Science and Technology, Metal Forming and Metrology, 5 Lukasiewicza Str., 50-371 Wrocław, Poland

autor

Janik M.

• Valves Extrusion, Mahle Polska

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Uwagi

EN

This study was founded by National Centre for Research and Development, Poland (grant no. TECHMATSTRATEG1/348491/10/NCBR/2017).