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COMPOSITE POWDER MATERIALS BASED ON LOW-ALLOYED STEELS: TECHNOLOGIES OF OBTAINING CONSTRUCTIONAL GOODS OF INCREASED STRENGTH THEREOF WITH USE OF HARDENING 125

  • : Alexander Ilyushchenko1, Balery Gorokhov, Igor Tarusov, Inna Golyakova
  • : 1Powder Metallurgy Institute
  • : PDF Download
  • : 2014

Abstract

Methods of producing high-strength powder steels at the sintering process combined with hardening have been investigated. The influence of composite materials’ composition, sintering temperature and hardening speed on main physical and mechanical properties of the obtained powder steels has been studied. The influence of composite materials’ composition and different modes of the sintering process combined with hardening on the structure, hardness, change in dimensions and bending strength of powder alloyed steels depending on the sintering temperature and the hardening speed in the flow of cold endogas has been found. It has been shown that hardening in endogas leads to the growth of carbon as part of the compositions in average by 0.2% (compared with hardening in gas consisting of H2-10%, N-90%) and to the increase of hardness by 10-15%. The influence of additives of refractory components based on tungsten on the structure and physical and chemical properties of powder alloyed steels has been identified. It has been found that it is possible to obtain a more finely grained structure at the introduction of optimal additives in the range of 0.2-0.4%, as well as to increase the hardness of steels hardened in the flow of cold endogas up to 55-57 HRC, which is by 10-15% higher than the hardness of the initial steels.
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