It is shown that the precipitation of large amounts (6.45–9.55%) of dispersed carbides (mainly of the cementite type) and Me
7
C
3
and (V, Mo)C special carbides in the process of annealing of ...60Kh2N4GМF steel within the range 350–800°С promotes an 18% increase in the hardness and a 1.5–1.61-fold increase in the wear resistance. The maximum hardening is attained in the case of low-temperature annealing at 450°С. We establish the dependence of the coercive force on hardness capable of guaranteeing the possibility to perform quality control under the conditions of manufacturing and determine the most efficient technological parameters of annealing without destroying the product.
It is shown that the precipitation of large amounts (6.45-9.55%) of dispersed carbides (mainly of the cementite type) and Me7C3 and (V, Mo)C special carbides in the process of annealing of ...60Kh2N4GÐoeF steel within the range 350-800°Ð¡ promotes an 18% increase in the hardness and a 1.5-1.61-fold increase in the wear resistance. The maximum hardening is attained in the case of low-temperature annealing at 450°Ð¡. We establish the dependence of the coercive force on hardness capable of guaranteeing the possibility to perform quality control under the conditions of manufacturing and determine the most efficient technological parameters of annealing without destroying the product.
The influence of multicyclic radiative and thermal treatment by an electron beam on the structure and properties of low-carbon steel is considered. With an optimal number of treatment cycles, the ...required structure and properties of the hardened surface are obtained. Radiative and thermal hardening by the proposed method modifies the working surface of the steel to a depth of 2 mm. The effectiveness of the method is confirmed by bench tests of complex rail bases: the cyclic durability of the parts is 30–40% longer than for traditional treatment (bulk quenching and quenching by high-frequency current). The new method is protected by an Inventor’s Certificate.
Reliable data on the structure of the deposited layer are very important due to the considerable instability of the process of deposition of coatings by the method of electric-arc metallization and ...the strict requirements for reconditioned crankshafts. The present paper is devoted to the structure of coatings obtained from powder wire based on ferrochrome-aluminum with additional alloying elements introduced into the charge.PUBLICATION ABSTRACT
A technology of heat treatment of railroad rails using induction heating has been developed and installed in the Azovstal' metallurgical works. It provides the requisite combination of properties in ...the metal of rail heads. However, the metal of the web and the bottom of the rails remains in the initial (unhardened) state. Under severe operational conditions (small-radius curves, high axial loads, and composite configuration of the road) the wear resistance of the head and the structural strength of the web and the bottom not hardened in the plant have to be increased. The properties of the rail steel can be improved by alloying it using the most effective and available elements. Currently, in Ukraine this is manganese. The present paper is devoted to the effect of manganese additives on the phase transformations in induction hardening and the specific features of the formed structure and properties of the rail steel. Optimum parameters for heat treatment of rails are recommended.PUBLICATION ABSTRACT
A technology of heat treatment of railroad rails using induction heating has been developed and installed in the Azovstal' metallurgical works. It provides the requisite combination of properties in ...the metal of rail heads. However, the metal of the web and the bottom of the rails remains in the initial (unhardened) state. Under severe operational conditions (small-radius curves, high axial loads, and composite configuration of the road) the wear resistance of the head and the structural strength of the web and the bottom not hardened in the plant have to be increased. The properties of the rail steel can be improved by alloying it using the most effective and available elements. Currently, in Ukraine this is manganese. The present paper is devoted to the effect of manganese additives on the phase transformations in induction hardening and the specific features of the formed structure and properties of the rail steel. Optimum parameters for heat treatment of rails are recommended. Rail steels studied: M76VG and M76T.
