Mihael Brunčko (Author), Ivan Anžel (Author), Alojz Križman (Author)

Abstract

Formiranje mikrostrukture med strjevanjem, ki je odvisno predvsem od hitrosti strjevalne fronte vSF in temperaturnega gradienta GSF v njeni bližini, močno vpliva na mehanske in druge lastnosti lite zlitine. Zato je za doseganje želenih lastnosti strjenih zlitin potrebno poznanje odvisnosti med vplivnimi parametri strjevanja ter nastajajočo mikrostrukturo. Merilne metode, ki omogočajo sprotno in neporušno spremljanje teh parametrov že v fazi formiranja mikrostrukture, so velik izziv pri razvoju modernih inženirskih materialov. V prispevku obravnavamo možnosti uporabe sprotnega merjenja spremembe električne upornosti med usmerjenim strjevanjem za določitev položaja in hitrosti strjevalne fronte vSF. Spremembo električne upornosti smo merili med usmerjenim strjevanjem vzorca evtektične zlitine Pb-Sn pri različnih hitrostih pomika vzorca iz grelne cone ter konstantnem temperaturnem gradientu peči. Tako dobljene vrednosti hitrosti strjevalne fronte vSF smo primerjali s tistimi, ki smo jih določili pri enakih pogojih strjevanja z meritvijo spremembe temperature s termočleni, nameščenimi v notranjosti vzorca.

Keywords

usmerjeno strjevanje;meritve električne upornosti;evtektična zlitina Pb-Sn;

Data

Language: Slovenian
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: Inštitut za kovinske materiale in tehnologije Ljubljana
UDC: 669.45:669.6:537.311
COBISS: 268202 Link will open in a new window
ISSN: 1580-2949
Views: 1048
Downloads: 83
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Other data

Secondary language: English
Secondary title: Monitoring of the eutectic Pb-Sn alloy during directional solidification
Secondary abstract: Microstructure evolution during solidification primarily depends on the velocity vSF and the temperature gradient GSF of the solidification front. It has a great influence on the mechanical and other properties of the cast alloys. It is therefore important to know the relationship between the influential solidification parameters and the evolving microstructure if the desired properties of solidified alloys are to be achieved. Thus, the measurement methods that allow online and nondestructive monitoring of these parameters represent a great challenge in the evolution of modern engineering materials. In this paper we discuss the usability of in-situ measurements of electrical resistance changes during the directional solidification for tracing the position and the velocity of the solidification front vSF. The electrical resistance changes were measured during directional solidification on a sample of the Pb-Sn eutectic alloy at different pulling velocities for displacing samples from the heating zone and at a constant temperature gradient of the furnace. The obtained values of the solidification front velocities vSF were subsequently compared with the values determined during the same solidification conditions by measuring the temperature changes with thermocouples, placed inside the sample.
Secondary keywords: directional solidification;electrical resistance measurements;eutectic Pb-Sn alloy;
URN: URN:NBN:SI
Type (COBISS): Scientific work
Pages: str. 367-374
Volume: ǂLetn. ǂ36
Issue: ǂšt. ǂ6
Chronology: 2002
ID: 1746637