Characteristics of secondary hardening of carburizing steels

Conclusions The higher secondary case hardness of steels tempered in the austenitic condition can be explained by the formation of more highly dispersed carbides during tempering due to the lower diffusion mobility of elements in austenite as compared with phase during the first tempering cycles and the smaller phase strain hardening of the matrix during subsequent tempering cycles, as well as the difference in composition and consequently the tendency of the carbide particles precipitated from austenite and martensite to coalesce.V. Ya. Chubar' Zaporozh'e Machine Construction Institute. Kherson Technological Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 62–63, July, 1975.     

Computer design of rational alloying of carburizing steels

Conclusions The use of computer approximation of the hardenability curve in standardized procedures of tests by the method of end quenching will raise considerably the efficiency of their use for practical prediction of the quality of quenching hardening of steels. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 33–35, July, 2000.     

Optimization of carburizing steels for drilling tools within grade chemical composition

Results of optimization of the chemical composition of steels 15N3MA and 14KhN3MA with the use of standard methods of statistical analysis of “composition-properties” data arrays with the aim of ensuring the required level of properties in commercial production are presented. It is possible to attain a specified set of properties by optimizing the alloying within grade composition.     

Strain hardening of low-carbon manganese steels

Conclusions Low-carbon steels with a high manganese content (3–5%) are highly susceptible to strain aging, which is accompanied by hardening due to precipitation of finely dispersed cementite particles. The increase of the manganese content, due to the displacement character of the transformation of austenite, increase the amount of carbon in solution and leads to precipitation hardening similar to the intermediate transformation activated by cold plasmic deformation. The dispersed structure formed in this case ensures high strength and ductility of the material.Moscow Automobile Factory. Moscow Evening Metallurgical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 47–51, September, 1980.