to blocking of ate phase A,18, in metallic alloys (hinary systemm A-B) b) Low va

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to blocking of ate phase A,18, in metallic alloys (hinary systemm A-B) b) Low value of the yield st c) Ability to plastic Nucleation rate (LZ) -effect of undercoeling a) Increases caused by ordered arrangement of ahooss A and B rength (Re) as a result of a complex latice and ordered asoenis hanks to the presence of dislocations forming during ordered atoation smaller y with increas AT because the critical size of a wacleus becomes LZ-RAT) has a maximum, L.Z with tdhe increase of undercooling initially increases and la liquid e) LZ monotonically decreases with increasing AT as a result of a more difficult not Parameters and shape of the crystallization lineties curve (for solidification) motion o ations in The shape of variously inclined letter, which depends on he nucleation growth rate G rane 1.2, and the crystal with a minimum, whose position depends on undercooling AT, LZ, crystal growth tate G Shape maximum, whose position depends on undercooling AT, L2 crystal growh rae a) Properties of the eutectics have intermediate values between those of the component A and B roperties of the alloy of eutectic composition in a binary A-B system b) Complex crystallographic lattice of the eutectic phase hinders the dislocation motion-high strength ad low ductility Interphase boundaries in the eutectics hinder the dislocation motion- high strength and low ductility utectie transformation in the A-B binary system (equilibrium conditions) o 'sothermal Oproceeds at constant temperature). two different solid phases crystallize simultaneously a) Proceeds in a certain temperature range- a solid phase called eutectics crystallizes trom a perature)- a solid phase called eutectics erystallizes from a liqui o) Isothermal (proceeds at constant tem endritic segregation is a result of: Larger content of a high-melting component in the arms of the dendrite and its smaller content between thesc these arms b) Larger content of impurities in the arms of the dendrite and its smaller content between these arms c) Smaller content of the high-melting component in the arms of the dendrite and its larger content between these arms Ferrite (Fe-Fe,C equilibrium phase diagram)- carbon solubility and its effect on properties Minute solubility (max. 0.02%) therefore ferrite is almost a pure iron Fea of similar properties b) Small solubility (max. 0.2%) but the influence of carbon on properties of ferrite is substantial (solid solution strengthening) Cementite (Fe- Fe C equilibrium phase diagram) a) Solid solution of carbon and iron atoms in the complex crystallographic lattice different than that of iron and carbon Iron carbide crystallizing in the fec lattice as the secondary solid solution c) Intermediate phase (intermetallic) crystallizing in a complex lattice different than that of iron and carbon Properties of perlite (Fe-Fe,C equilibrium phase diagram) a) Rapture strength (Rm) ~ 400 MPa, elongation (A)-20% b) Rapture strength (Rm) ~ 600 MPa, elongation (A)-15% Rapture strength (Rm) ~ 800 MPa, elongation (A)-10% quilibrium structure of the alloy (steel) containing 0.65 wt% C (in room temperature) a) Perlite+ small amount of the secondary cementite at the grain boundaries of the former austenite c) Perlite + ferrite in similar amounts (-50% each) Draw the Fe-Fe,C binary phase diagram er austenitemer austenite t of ferrite at the grain boundaries of the former austenite Perlite +small amount -mark the characteristic temperatures and carbon concentrations -mark the points in which the characteristic reactions take place, name them and write how they proceed For the alloy containing 1,7 wt. % C calculate using the lever rule (at room temperature): a) the shares of ferrite and cementite b) the shares of microstructural components

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