A method is proposed for calculating the nitrogen equilibrium partial pressure p N2 of stoichiometric and nonstoichiometric nitrides MN y and carbonitrides MC y N 1Ày (M Ti, Zr, Hf, V, Nb, Ta) with B1(NaCl)-type structure. Analytic forms are derived for the composition, nonstoichiometry, and temperature dependences of the nitrogen partial pressure of the afore-mentioned compounds. The partial pressure of N 2 for the MN y nitride or MC x N y carbonitrides at a given temperature T is found to be proportional to the pressure of nitrogen for MN yc nitride evaporating congruently at that temperature T. The nitrogen partial pressure p N2 yY T of titanium nitrides TiN y 0X45 y 1X0 and carbonitrides TiC x N y 0X50 x y 1X0Y 0 y 1X0, vanadium nitrides VN y 0X55 y 1X0 and carbonitrides VC x N y 0X60 x y 1X0Y 0 y 1X0, niobium nitrides NbN y 0X70 y 1X0 and carbonitrides NbC x N y 0X70 x y 1X0Y 0 y 1X0 of various compositions at temperatures of 1000 to 2400 K are calculated. The calculation results are compared with the experimental data of literature.

No abstract

No abstract

Evaluation of the joint effect of the chemical composition of flux cored wires on the wear and hardness of the deposited layer was carried out using mathematical-statistical methods, allowing the influence of the chemical composition of the flux cored wires on the performance of the weld layer of the mining equipment to be revealed. According to the results of the multifactor correlation analysis, the dependences of the hardness of the deposited layer and its wear resistance on the mass fraction of elements included in the flux cored wires composition of the Fe-C-Si-Mn-Cr-Ni-Mo system were determined. The obtained dependences are used to predict the hardness of the deposited layer and its wear resistance when the chemical composition of the weld metal is changed. New, protected by patents of the Russian Federation, flux cored wires of the system Fe-C-Si-Mn-Cr-Ni-Mo for surfacing the mining equipment were developed.