Effect of microstructural banding in hot-work tool steel on thermal expansion anisotropy

• Autorzy: Pawłowski B. , Bała P. , Dziurka R. , Krawczyk J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The objective of the present work was to study the effect of the microstructural banding on the thermal anisotropy of hot-work tool steel used for die for aluminium alloy die-casting. In particular, the major purpose of this research was to find possible correlation between geometrically oriented thermal expansion coefficient values and the presence of number of parallel cracks on the working surface of die. Design/methodology/approach: The studies were performed on the specimens which were cut from the failed prematurely die along the three axes of the coordinate system (X-axe was parallel to the cracks direction). Macroscopic, metallographic, SEM and dilatometric examination were made. Findings: Surface cracks of die are parallel to the microstructural banding orientation. Differences in the values of thermal expansion coefficient determined along the three axes of the coordinate system probably promote cracks propagation direction. Research limitations/implications: Studies were performed on the single prematurely failed die for economic reason. This work findings should be compared to the similar examinations results obtained for the another failed dies. Practical implications: The incorrect microstructural banding orientation of the die core and related differences in the values of thermal expansion coefficient promote crack propagation. Originality/value: This show the relationship between microstructural banding and the thermal anisotropy of hot-work tool steel used for die for aluminium alloy die-casting.

Słowa kluczowe

EN

microstructural banding; thermal expansion anisotropy; surface cracks; die for aluminium die-casting

PL

pęknięcia powierzchniowe; włókno mikrostrukturalne; właściwości anizotropowe; odlewanie aluminium

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2013
• Tom: Vol. 56, nr 1
• Strony: 14--19
• Opis fizyczny: Bibliogr. 15 poz., rys., tab.

Twórcy

autor

Pawłowski B.

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Bała P.

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Dziurka R.

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Krawczyk J.

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

• [1] J.P.M. Hoefnagels, B.G. Vossen, C.C. Tasan, Electron micrographic digital image correlation: method opitimization and microstructural banding case study, Proceedings of the Society for Experimental Mechanics Annual Conference International Congress and Exposition on Experimental and Applied Mechanics, Indianapolis, 2010, 71-77.
• [2] G. Krauss, Steel, Processing, structure and performance, ASM International, Metals Park, Ohio, 2005.
• [3] R.A. Jaramillo, M.T. Lusk, M.C. Mataya, Dimensional anisotropy during phase transformations in a chemically banded 5140 steel. Part I: experimental investigation, Acta Materialia 52 (2004) 851-858.
• [4] A.A. Korda, Y. Mutoh, Y. Miyashita, T. Sadasue, S.L. Mannan, In situ observation of fatigue crack retardation in banded ferrite-pearlite microstructure due to crack branching, Scripta Materialia 54 (2006) 1835-1840.
• [5] H.H.D.H. Bhadeshia, Phase transformations contributing to the properties of modern steels, Bulletin of the Polish Academy of Sciences, Technical Sciences 58 (2010) 255-265.
• [6] J. Krawczyk, B. Pawłowski, P. Bała, Banded microstructure in forged 18CrNiMo7-6 steel, Metallurgy and Foundry Engineering 35 (2009) 45-53.
• [7] M. Bonek, L.A. Dobrzański, E. Hajduczek, A. Klimpel, Laser modification of surface layer properties of a hot-work tool steel, Journal of Achievements in Materials and Manufacturing Engineering 14 (2006) 152-156.
• [8] L.A. Dobrzański, E. Jonda, K. Labisz, The influence of laser modification on the structure and properties of the X40CrMoV5-1 and 32CrMoV12-28 hot work tool steels, Archives of Materials Science and Engineering 41 (2010) 104-111.
• [9] L.A. Dobrzański, E. Jonda, A. Križ, K. Lukaszkowicz, Mechanical and tribological properties of the surface layer of the hot work tool steel obtained by laser alloying, Archives of Materials Science and Engineering 28 (2007) 389-396.
• [10] M. Rosso, D. Ugues, M. Actis Grande, The challenge of PM tool steels for the innovation, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 175-178.
• [11] B. Pawłowski, P. Bała, T. Tokarski, J. Krawczyk, Improper heat treatment as root cause of premature cracking of dies for aluminium alloy die-casting, Submitted to publication.
• [12] Uddeholm Dievar. Uddeholms AB Sweden brochure, Edition 9, 2012.
• [13] S.Z. Qamar, A.K. Sheikh, A.F.M. Arif, T. Pervez, R.A. Siddiqui, Heat treatment of a hot-work die steel, Archives of Materials Science and Engineering 28 (2007) 503-508.
• [14] B. Kosec, G. Kosec, M. Soković, Temperature field and failure analysis of die-casting die, Archives of Materials Science and Engineering 28 (2007) 182-187.
• [15] Special Quality Die Steel & Heat Treatment Acceptance Criteria for Die Casting Dies, NADCA #207-2008, North America Die Casting Association, 2008