Mikrostrukturní změny materiálu účinky WEDM studované pomocí analýzy TEM lamel

Study of micro structural material changes after WEDM based on TEM lamella analysis

článek v časopise ve Web of Science, Jimp

en

Wire electrical discharge machining is an unconventional machining technology that is crucial in many industries. The surface quality of the machined parts is carefully monitored, but the condition of the subsurface layer also plays a crucial role, especially in case of defects occurrence such as cracks or burnt cavities. The subsurface layer of individual materials is affected differently due to wire electrical discharge machining. For this reason, this study was carried out focusing on a detailed analysis of transmission electron microscope (TEM) lamellae made of Ti-6Al-4V titanium alloy, AlZn6Mg2Cu aluminium alloy, pure molybdenum, Creusabro 4800 steel, and Hardox 400 steel. The attention was first of all paid to the concentration and distribution of individual elements in the recast layer and also in the base material, which was often affected by Wire electrical discharge machining. Further, a diffraction analysis was performed for each TEM lamella in the adhesive area and in the area of the base material. In order to assess the macro-effects on the machined material, the analysis of the topography of the machined surfaces and the morphology analysis were performed using electron microscopy.

Elektroerozivní drátové řezání je nekonvenční technologie obrábění, která je klíčová v mnoha průmyslových odvětvích. Jakost povrchu takto obrobených dílů je pečlivě monitorována, nicméně stav podpovrchové vrstvy hraje také klíčovou roli a to především při vzniku defektů v podobě trhlin či vypálených kavit. Podpovrchová vrstva u jednotlivých materiálů je v důsledku elektroerozivního obrábění ovlivněna odlišným způsobem. Z toho důvodu byla provedena tato studie zabývající se detailní analýzou TEM lamel vyrobených z hliníkové slitiny AlZn6MgCu, titanové slitiny Ti-6Al-4V, čistého molybdénu, oceli creusabro 4800 a oceli hardox 400. Pozornost byla věnována především koncentraci a rozložení jednotlivých prvků v oblasti recast layer a také v základním materiálu, který byl často účinky WEDM také ovlivněn. Dále byla u každé TEM lamely provedena difrakční analýza v oblasti přílepku i v oblasti základního materiálu.

Wire electrical discharge machining is an unconventional machining technology that is crucial in many industries. The surface quality of the machined parts is carefully monitored, but the condition of the subsurface layer also plays a crucial role, especially in case of defects occurrence such as cracks or burnt cavities. The subsurface layer of individual materials is affected differently due to wire electrical discharge machining. For this reason, this study was carried out focusing on a detailed analysis of transmission electron microscope (TEM) lamellae made of Ti-6Al-4V titanium alloy, AlZn6Mg2Cu aluminium alloy, pure molybdenum, Creusabro 4800 steel, and Hardox 400 steel. The attention was first of all paid to the concentration and distribution of individual elements in the recast layer and also in the base material, which was often affected by Wire electrical discharge machining. Further, a diffraction analysis was performed for each TEM lamella in the adhesive area and in the area of the base material. In order to assess the macro-effects on the machined material, the analysis of the topography of the machined surfaces and the morphology analysis were performed using electron microscopy.

WEDM; elektroeroyivní obrábění; mikrostruktura; TEM lamela; přílepek; topografie; morphologie

WEDM; electrical discharge machining; microstructure; TEM lamella; recast layer; topography; morphology

07.06.2020

MDPI

Švýcarská konfederace

2075-4701

10

7

1–21

21