Search academic texts

Information × Registration Number 0201U005663, 0198U000362 , R & D reports Title High-strength corrosion-resisting steels for aircraft industry popup.stage_title Head Gavrylyuk Valentyn Genadiyevych, Registration Date 05-09-2001 Organization Institute for metal physics NAS Ukkraine popup.description2 The main concept of project consist in using of combining nitrogen additions together with carbon additions for the purpose of creation of steel for high-strength and corrosion-resisting cold-shaped products for aircraft industry.Purpose of project consist in elaboration of new economically alloyed steel having optimal composition and decrease of nickel content without loss of corrosion resistance properties at high mechanical properties. It was shown, that nitrogen alloying of austenitic steels increases concentration of free electrons, carbon alloying decreases of it. Correlation between sort of prelevant interatomic bond was found. It was determined, that nitrogen and, particularly, nitrogen+ carbon intensify metallic bond in austenitic steels and promote atomic ordering. Mechanism of hardening by nitriding of austenitic steels and interaction between lattice defects and soluted atomics was specified. It was determined, that nitrogen intensifies strain hardening of austenitic steels and promotes m echanical twinning. Decrease of stacking fault energy accounts for the twinning. Correlation between concentration of free electrons and stacking fault energy has been found. It has been shown, that bond energy between nitrogen atoms and dislocations is higher then energy of bond between dislocations and carbon atoms. That enables to explain anomalous hardening by grain boundaries. Nitrogen+carbon alloying enables to rich yield stress more than 2000 Mpa at the satisfactory moldability. It has been invented high-strength and corrosion-resisting steels, which has been proposed for utilization in aircraft industry. Act of Science-Industrial Complex with result of spring test, which has been made of developed steels, has been attached. It has been apply for patents: "High-strength stainless steel" (registration number 2000105603, dated 02.10.2000), "Hydrogen-resisting steel" (registration number 34572А, dated 15.03.2001). Product Description popup.authors popup.nrat_date 2020-04-02 Close