Effect of the martensite volume fraction on the machining of a dual-phase steel using a milling operation
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Date
2011Metadata
Citation
Topcu, O., Ubeyli, M., Acir, Adem, (2011). Effect of the martensite volume fraction on the machining of a dual-phase steel using a milling operation. Materiali in Tehnologije, 45(2), 145-150.Abstract
Dual-phase steels are attractive because of their good combination of strength and ductility. However, an increase in the martensite content will decrease the steel's machinability significantly. Therefore, optimum cutting parameters in the machining of suca materials should be determined. In this paper, the machinability of a low-alloy steel having various martensite volume fractions was investigated. The four groups of samples, three of which were intercritically annealed at three different temperatures and one of which was normalized, were used. Then, the machining experiments were carried out using a face-milling operation with two different tools. After that, the flank wear on the tools with respect to the chip-volume or flank-wear limit was determined for each case. Next, the surface roughness of the samples was measured. Finally, the wear behavior of the tools was examined with a scanning electron microscope (SEM). The experimental results indicated that the flank wear of the tools increased dramatically with the increasing martensite content of the dual-phase steels. Dvofazno dualno jeklo se odlikuje po dobri kombinaciji trdnosti in duktilnosti. Pri pove~anju vsebnosti martenzita se
obdelovalnost pomembno zmanj{a, zato je treba za jeklo dolo~iti optimalne pogoje rezanja. V tem delu je bila raziskana
obdelovalnost malolegiranega jekla z razli~nim volumenskim dele`em martenzita. Uporabljene so bile {tiri skupine vzorcev, tri
izmed njih so bile interkriti~no `arjene pri treh razli~nih temperaturah, ena pa je bila samo normalizirana. Obdelovalni preizkusi
so bili izvr{eni s ~elnim rezkanjem z dvema razli~nima orodjema. Nato je bila za vsak primer dolo~ena ~elna obraba orodij
glede na prostornino ostru`kov ali mejna vrednost ~elne obrabe in tudi hrapavost povr{ine obdelancev. Obrabno vedenje orodij
je bilo raziskano z vrsti~nim elektronskim mikroskopom (SEM). Poskusi so pokazali, da ~elna obraba orodij dramati~no raste z
vsebnostjo martenzita v dualnem jeklu.