Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 3

Microstructure of a traditional scythe blade using a SEM, the FIB technique and a TEM

nr katalogowy: 78029

The objective of this paper is the analysis of the microstructure of a traditional scythe blade (Fig. 1). The scythe, first recorded about 500 BC and introduced into Europe in the 12th century, is an agricultural hand tool for mowing grass and reaping crops. It was widely used for many centuries until replaced almost completely by mechanical apparatus in the XX century. However, the scythe is still used today in many smaller farms for cutting down extensive areas of long grass, bracken and weeds. Recently scythes have been making a comeback in American suburbs due to the following advantages: the quietness of operation, the lack of necessary fuel, and the fact that it does not overheat, as do many machines. It also provides physical exercise for the user [1]. The traditional scythe consists of a long, wooden shaft (about 1.6 to 2.0 m) and a long, curved blade (about 0.6 to 0.9 m). The blade?fs cutting edge is on the inner side of the curvature, making mowing and collecting plants more convenient. During use the blade quickly becomes blunt and therefore requires regular sharpening. After a series of sharpenings, the blade is subjected to a peening process, during which the edge is plastically thinned by a hammering process, which enables further sharpening thus extending its working life. Peening increases the hardness of the metal on the edge as well as thinning the blade. The process itself is difficult and requires a much experience. Incorrectly performed, peening can cause a blade to fold and damage the scythe. The hammering resembles severe plastic deformation processes currently used for nanost[...]

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