Abstract
The results of the study of anhydrous carbohydrogenation influence in a smoldering discharge on the microhardness of a hardened 12XH3A steel layer depending on the propane content and pressure of the gas environment are presented in the paper. In accordance with the developed methodology of studying the influence of technological parameters of the process of carbonylation on the properties of structural materials, optimal modes of hardening of 12XH3A steel, depending on the operating conditions have been found
Highlights
Carbohydration in glow discharge is the process of saturation of the metal surface with nitrogen and carbon at low temperatures
Without hydrogen nitriding in a glow discharge (BATR) with propane additives, a layer with a developed carbonitride surface zone is formed, which is contained in the zone of internal nitriding carbonitride mesh along the boundaries of austenitic grains
Plasma discharge carbohydration technology has been developed in anhydrous media, one of the advantages of which is the controllability of technological parameters of the process in order to achieve the optimum physical and mechanical properties of the strengthened materials and, as a consequence, to increase their operational characteristics
Summary
Carbohydration in glow discharge is the process of saturation of the metal surface with nitrogen and carbon at low temperatures (from 500 °C to 600 °C). The results of studies of this process are presented in [1, 2] In these works, the simultaneous saturation of metal with carbon and nitrogen was not considered as an independent method of surface hardening, but the effect of carbon on the structure and properties of nitrided layers during quenching in ammonia plasma with the addition of carbon containing gases was investigated. The maximum development of the carbonitride zone is obtained with a propane content in the mixture of 8 % to 12 % In this case, its thickness is 1.5 times greater than the depth of the nitride zone, which is obtained by nitration in ammonia plasma. With a propane content of about 40 %, the growth of the nitrided layer is suppressed, apparently due to the formation of a carbonitride or carbographic film on the surface
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