Advanced metallic materials prof. Priit Kulu December 2010

Advanced metallic materials

Prof. Priit Kulu12OutlineHigh-strength structural steelsHigh-performance tool steelsMetallic-ceramic materialsLight-weight metals and alloysSuperalloys

Advanced metallic materials23Advanced metallic materials3Advanced metallic materialsMetallic materials with superior propertiesSuperconductive NbTi, Nb3Sn, Nb3GeStructural alloysNeodymium rare-earth magnets (alloys of Nd, Fe and B) are strongest known permanent magnets. Sm-Co magnetsMg- and Al-alloys with superior properties, Al-metaglass, foamsTi-alloys with thermomechanical properties, superalloys, maraging steels, intermetallides, high-density alloys, shape-memory alloysBiocompatible Ti-alloysAmorphous alloys with chemical and thermal properties, Ni- and Fe aluminates 4Strength groups of materialsClassification based on tensile strength (Rm) of materials

Low-strength ( 600C)refractory steels = heat res. + high temp. strength32Advanced metallic materials33Ni-alloysNi uses: ca 60% stainless steels12% Ni-alloys10% coatings10% alloy steels Heat resistant alloys (superalloys)wrought (Inconel Ni 20-23 Cr; Hastelloy Ni- 7-22 Cr-Co)cast ( polycrystalline, directionally solidified, single crystal)PM (HIP-ed, IN 100, Rene 95 gasturbine disk)718 (cast) Ni (4,75 5,5%) Nb aerospace, nuclear structuralapplications (-250 +700 C).MA 754 PM/HIP Ni 1% Y2O3

33Advanced metallic materials34Co-alloysCo uses: ca46% superalloys15% steels10% cemented carbidesWear resistant alloysStellite Co (10 30%); Cr (1,5 22) Ni; up to 15% W; 1 MoHeat resistant alloyswrought Co + (20 30%) Cr; (14 15%) Wcast Co +(23 29%) Cr; (1 10 %) Ni; 7 WCorrosion resistant alloysUltimet Co + 26Cr; 9Ni; 5Mo; 2W

34Advanced metallic materials35General stress-rupture behaviour of superalloys

36Thank you for your attention!TUT materials engineering web-site: www.ttu.ee/mtimti@ttu.ee