Investigation of the structure and properties of coatings deposited on ceramic tool materials

Structure And Properties Of PVD Coatings Deposited On Cermets

“…However the concentration of cobalt cannot be too large, because favor increased abrasive wear [1,2,11]. The application of PVD for the acquisition of gradient coatings of high wear resistance, also in high temperatures, enables to improve the properties of these materials in machining conditions, among others by the reduction of friction factor, increase of microhardness, improvement of tribological contact conditions in the contact area tool-machined item it makes it also possible to protect these materials against adhesive or diffusive wear and against oxidation [3][4][5]7,[10][11][12][13][14][15][16]. At the present time, coatings obtained by PVD process are widely used in the sintered tool materials industry.…”

Mechanical Properties of High-Mn Austenitic Steel Tested under Static and Dynamic Conditions

“…The modern quality requirements for automotive vehicles and other means of transport relate primarily to implementation of programmes improving the passive safety of traffic users, to possibly lowest weight of vehicles and to the resulting reduction in fuel consumption and in the related emission of fumes into the air, as well as to comfort, aesthetics and many other aspects. It is claimed according to the views presented at present [8][9][10] that new steels with an austenitic A1 structure containing Mn at a concentration of above 25% and Si and Al may ensure significant progress, especially in automotive applications [1][2][3][4], as opportunities have already been practically exploited to improve strength and plasticity for steel with an A2 lattice structure -ferritic and martensitic steels (hsLA type -high strength Low Alloy steels, bh type -bake hardening steels, IF type -Interstitial Free, IS type -Isotropic Steels, multiphase steels of DP type -Dual Phase, TriP type -Transformation induce Plasticity steels, cP type -complex Phase, PM typePartially Martensitic steels and Ms type -Martensitic steels) [1,[4][5][6][7][22][23][24][25][26][27][28][29][30][31][32]. Steels containing 22-35% of Mn exhibit a fully stable austenite structure, and at a concentration of more than 25% Mn, they show plasticity induced by mechanical twinning during cold plastic deformation, called the TWiP effect.…”

“…high manganese austenitic steels can be used for plates and structural parts of cars as, respectively, reinforcement and controlled plastic deformation zones of cars (body), behaving in a controlled and pre-programmed manner, during dynamic cold plastic deformation occurring especially in a car accident, and as reinforcement of side doors enabling to absorb as much energy as possible during side car impact, which also relates to truck cabins [1,[22][23][24][25][26][27]. For this reason, the work investigates the influence of a cold plastic deformation rate of X73MnSiAlNbTi25-1-3 steel in the range from 0.008 s -1 (static conditions) to deformation at a rate of 1000 s -1 (dynamic conditions), simulating one of the possible plastic deformation cases which may take place during a car accident.…”

Characterization of Nanometric-Sized Carbides Formed During Tempering of Carbide-Steel Cermets

“…So far examination of carbide-steel cermet produced by powder injection moulding was carried out mainly in the scanning electron microscope. The purpose of this article is to examine the precipitated carbides using techniques available in transmission electron microscopy [1][2][3][4][5][6].…”