Development of advanced alloy steels for machinery
2021
Aftandiliants, Ye., National Univ. of Life and Environmental Sciences of Ukraine, Kiev (Ukraine) | Gnyloskurenko, S., National Univ. of Life and Environmental Sciences of Ukraine, Kiev (Ukraine)
Industry and our daily life place high demands on construction materials, among which steels are the most prospective. Particularly, agricultural machinery greatly depends on high quality steels for more reliable and efficient machines. So, the development of advanced steels is an important task for material science. The present paper concerns the complex analytic and experimental study of the processes at crystallization and recrystallization in solid of alloyed structural steels, containing up to 0.4 wt.% C, 2% Si, Mn and Cr, 0.035% N, 0.3% V and their relation to mechanical and operational properties. The processing of steels was undertaken at melting in an induction furnace, including varying Si, Mn, Cr content and alloying by V and N, subsequent deoxidation by SiCa and Al. Different thermal treatment of the samples was applied, including quenching, hardening, tempering, and normalization. The analysis of the established regularities allowed realizing in practice proper steel processing and providing an increased level of steel strength without reducing in plasticity. It was determined that the tensile strength of the steels was increased with increment of 80−120 MPa after normalization and of 200−250 MPa in quenched and tempered state, whereas the fatigue limit was increased by 100−120 MPa. The part of the tractor made of the processed alloy steel has shown better performance and wear resistance than commonly used carbon steel proving the effect of alloying and thermal treatment.
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