EXAMEN AMS MARTES

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SI LO ENCUENTRAS TUS ECS

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Albert Casanova Aragonés

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EXAMEN AMS MARTES


EXAMEN AMS MARTESOnline version SI LO ENCUENTRAS TUS ECS by Albert Casanova Aragonés 1 Grain size can be regulated by Escoge una o varias respuestas a rate of solidification from the liquid phase b plastic deformation followed by heat treatment c rate of cooling from the solid phase d chemical composition of the alloy 2 Isopleth is a : a a solubility curve that separates a single-solid phase region from liquid-solid phase region b line that separates uniform solid solution region from liquid phase region c line on a phase diagram that shows constant chemical composition d a solubility curve that separates a single-solid phase region from two-solids phase region 3 Phase is: Escoge una o varias respuestas a physically homogenous b chemically inhomogeneous c mechanically separated from other phases d a portion of material system 4 Type of diffusion is: Escoge una o varias respuestas a volume diffusion b grain boundary diffusion c surface diffusion d Kirkendall diffusion 5 Ferrite: a is a solid solution of carbon in FCC iron b is a solid solution of carbon in BCC iron c transforms to FCC –austenite at 812°C d transforms to FCC – high temperature ferrite at 1394°C 6 Spheroidite : a forms during long heating of martensite or bainite. b is a mixture of ferrite precipitations and pearlite lamellas c consists of the ferrite matrix and cementite precipitations d can be created during high tempering 7 Purposes of heat treatment are: Escoge una o varias respuestas a to soften the metal prior to shaping b to relieve the effects of strain hardening c to achieve the final strength required in the finished product d to achieve the hardness/toughness required in the finished product 8 Nitrocarburizing Escoge una o varias respuestas a improves wear/friction resistance b is done in the temperature range about 482 to 593°C c is done above A1 temperature d is a short-cycle process 9 Properties of aluminum alloys are: Escoge una o varias respuestas a high fatigue resistance b high thermal conductivity c high oxidation resistance d resistance to strong caustic solutions 10 Cobalt based superalloys: Escoge una o varias respuestas a are heat resistant alloys b consist over 20% of chromium c are called Hastelloys and Iconels d are suitable for applications over 900°C 11 Physical Vapor Deposition (PVD): Escoge una o varias respuestas a is atomistic deposition processes b is a process in which material is vaporized from a solid or liquid source c is used to deposit films with thicknesses in the range of a few nm to thousands of nm d can be used to form multilayer coatings 12 Malleable irons: Escoge una o varias respuestas a are produced by heat treating white iron at elevated temperatures for long times b are less ductile than grey irons c are suitable for castings of thin thickness d are expensive to produce, largely due to the heat treatment 13 Nickel alloys are: Escoge una o varias respuestas a Cu-Zn alloys b bronzes c cupronickels d inconels 14 Stainless steels can be divided into: Escoge una o varias respuestas a Ferritic: Fe-Cr alloys b Martensitic: Fe-Cr alloys c Austenitic: Fe-Cr-Ni alloys d Duplex alloys 15 Main categories of PVD processes are: Escoge una o varias respuestas a vacuum evaporation b sputter deposition c ion plating d ultra high vacuum plating 16 Cementite a is a metastable intermetallic compound b contains maximum 2.11% of carbon c is an iron carbon-nitride d has chemical formula Fe2C 17 Ausforming: Escoge una o varias respuestas a creates fine pearlite structure b is a thermomechanical heat treatment in which austenite is plastically deformed c is done below the A1 temperature. d creates bainite or martensite structure. 18 Hardenability depends on: Escoge una o varias respuestas a alloy composition b austenite grain size c shape of the part d Jominy factor 19 Eutectic: Escoge una o varias respuestas a has chemical composition independent on the chemical composition of the alloy b has the lowest melting temperature from all alloys in particular systems c solidifies at constant temperature d is harder than other system phases 20 Grain size Escoge una o varias respuestas a Can be regulated by the rate of solidification b Is a barrier for dislocation motion c Can improve strength and toughness of an alloy d Depends on the annealing temperature 21 Eutectic reaction Escoge una o varias respuestas a is a three phase reaction b causes formation of two solids c runs in constant temperature d requires continuous cooling in eutectoid temperature 22 Purposes of heat treatment are Escoge una o varias respuestas a to soften the metal prior to shaping b to relieve the effects of strain hardening that occurs during cold forming c to achieve the final strength and hardness/toughness required in the finished product as one of the end manufacturing processes d to harden the material prior to machining 23 Vacuum carburzing: Escoge una o varias respuestas a is a boost-diffusion-type process b allows to avoid internal oxidation c allows application of higher process temperature than conventional carburizing d Is carried out in mixture of hydrocarbons and ammonia 24 Jominy distance is: Escoge una o varias respuestas a related to the cooling rate b measured from the quenched end of the Jominy bar c is given in HV d is related to the diameter of the Jominy bar 25 Austenite: a is a solid solution of carbon in FCC iron b is a solid solution of carbon in BCC iron c transforms to FCC -ferrite at 812°C d transforms to FCC - high temperature ferrite at 1394°C (transforms into bcc ferrite at 1395*C) 26 Nitriding of steels a is performed at temperatures over 700°C b increases the fatigue life of elements c requires annealing after the process to increase the effect of strengthening d causes high distortions of elements 27 Proprties of titanium alloys are Escoge una o varias respuestas a High specific strength b high thermal conductivity c high oxidation resistance d resistance to sea water corrosion 28 Iron based superalloys: Escoge una o varias respuestas a are heat resistant alloys b consist over 40% of chromium c are called Hastelloys and Iconels d are suitable for applications below 700°C 29 Gray cast irons: Escoge una o varias respuestas a are used for their low cost and excellent castability b are less brittle than white irons c are used under compressive loading conditions d is equal half the tensile stress 30 Critical resolved shear stress: Escoge una o varias respuestas a is required to cause the dislocation to move b is produced on a slip system c is a minimum shear stress required to initiate slip d is equal half the tensile stress 31 Precipitations taking part in material strengthening should be: Escoge una o varias respuestas a hard and discontinuous b small and numerous c needle-like d round and big 32 Dislocation density a is a total dislocation length per unit volume of material b is characterised by Burger vector length c is a number of atoms placed along a line on random section d is higher in annealed materials 33 Hardenability depends on Escoge una o varias respuestas a alloy composition b austenite grain size c shape of the part d ferrite grain size 34 Recovery: Escoge una o varias respuestas a eliminates residual stresses b reduces strength of an alloy c eliminates all effects of strain hardening d is a low temperature annealing 35 Mechanisms of diffusion are: Escoge una o varias respuestas a vacancy diffsuion b self diffusion c interstitial diffusion d Fick's diffusion 36 Nickel-iron based alloys Escoge una o varias respuestas a are soft magnetic materials b can consist Mn and Si to improve melting conditions c can consist S to improve magnetic properties d are non-magnetic because of austenite presence in the structure 37 Microsegregation: Escoge una o varias respuestas a is also known as coring b is a presence of composition differences in material over large distances c is caused by nonequilibrium solidification d is the chemical interdendritic segregation 38 Cementite Escoge una o varias respuestas a is a metastable intermetallic compound b contains 4,67% of carbon c is an iron-carbon nitride d has chemical formula Fe3C 39 Annealing: Escoge una o varias respuestas a is a heat treatment used to produce a soft, coarse pearlite in steel b is a simple heat treatment to produce a fine pearlitic structure c is a low-temperature heat treatment used to eliminate all or part of the effect of cold workingfin steels d improves machinability 40 High strength low alloy steels (HSLA): Escoge una o varias respuestas a have increased Si (over 1%) content b have reduced C content (below 0.3%) c have increased Mn content (>1%) and to compensate the loss of strength d become brittle during welding 41 Dispersion strengthening a causes movement of grain boundaries b increases the strength of material by forming ultra-fine dispersions of second phase c eliminates the effect of strain hardening d decreases the hardness of material 42 Pack carburizing : a is a process in which parts are immersed in salts b uses barium carbonate as a main reagent c is realized in fluidized beds d is followed by hardening in gases 43 Slip in crystals: Escoge una o varias respuestas a is produced by shear stress b occurs on a slip plane c is characterized by slip vector d varies in direction for polycrystalline materials 44 Marquenching is: a quenching austenite to a temperature just above the Ms and holding until the temperature is equalized throughout the steel b is a thermo-mechanical heat treatment in which austenite is plastically deformed below the A1 temperature c is a thermo-mechanical heat treatment in which ferrite is plastically deformed below the Al temperature d quenching austenite to a temperature just above the Mf and holding until the temperature is equalized throughout the steel 45 Ausforming is: a quenching austenite to a temperature just above Ms and holding until the temperature is equalized throuught the steel b is a thermo-mechanical heat treatment in which austenite is plastically deformed below the Al temperature c is a thermo-mechanical heat treatment in which ferrite is plastically deformed below the Al temperature d quenching austenite to a temperature just above the Mf and holding until the temperature is equalized throughout the steel 46 Ferrite: Escoge una o varias respuestas a is a solid solution of carbon in FCC iron b is a solid solution of carbon in BCC iron c transforms to FCC –austenite at 912°C d transforms to FCC – high temperature ferrite at 1394°C 47 Martenistic transformation Escoge una o varias respuestas a is diffusionless b requires continuous cooling between ms and mf temperatures c is possible only in ferrous alloys d creates structure consisting of martensite and retained austenite 48 Normalizing Escoge una o varias respuestas a is a heat treatment to produce fine pearlite structure b consist in austenizing and air cooling c creates coarese spheroidal cementite d is applied to soften tool steels before machining 49 Recovery Escoge una o varias respuestas a is a low temperature annealing that eliminates residual stresses induced by cold working b is a high temperature annealing that eliminates residual stresses induced by cold working c eliminates the effect of the strain hardening d does not reduce the strength of cold-worked material 50 Mechanisms of diffusion are: Escoge una o varias respuestas a interstitial diffusion b self-diffusion c vacancy diffusion d substitutional atom diffusion 51 Hume-Rothery rules are: Escoge una o varias respuestas a size factor b crystal structure c valence d electronegativity 52 Nitrocarburizing Escoge una o varias respuestas a improves wear/friction resistance. b is done in the temperature range about 482 to 593°C c is done above A1 temperature d is a short-cycle process 53 Iron based superalloys: Escoge una o varias respuestas a are heat resistant alloys b consist over 20% of chromium c are called Hastelloys and Iconels d are suitable for applications below 700°C 54 Copper alloys are: Escoge una o varias respuestas a Cu-Zn alloys b bronzes c cupronickels d monels 55 In steels: Escoge una o varias respuestas a increasing carbon content decreases permeability b mechanical hardness shows high degree of similarity with the coercive force c increasing volume fraction of carbide particles increases coercivity d annealing increases permeability 56 Slip system Escoge una o varias respuestas a is a combination of slip plane and slip direction b is a combination of slip step and slip vector c consists of edge dislocations only d consists of more than 10^10 dislocations 57 Annealing a A heat treatment used to produce a soft, coarse pearlite in steel b A simple heat treatment obtained by austenitizing and air cooling to produce a fine pearlitic structure c A low-temperature heat treatment used to eliminate all or part of the effect of cold working in steels d Improves machinability 58 Dispersion strengthening a causes movement of grain boundaries b increases the strength of material by forming ultra-fine dispersions of second phase c eliminates the effect of strain hardening d decreses the hardness of material 59 Solvus is a : a a solubility curve that separates a single-solid phase region from liquid-solid phase region b line that separates uniform solid solution region from liquid phase region c line on a phase diagram that shows constant chemical composition d a solubility curve that separates a single-solid phase region from two-solids phase region 60 Recristallization: Escoge una o varias respuestas a is a low temperature annealing that eliminates residual stresses induced by cold working b is a high temperature annealing that eliminates residual stresses induced by cold working c eliminates all the effects of the strain hardening d does not reduce the strength of cold-worked material

EXAMEN AMS MARTES

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EXAMEN AMS MARTESOnline version

by Albert Casanova Aragonés

Grain size can be regulated by

Isopleth is a :

Phase is:

Type of diffusion is:

Ferrite:

Spheroidite :

Purposes of heat treatment are:

Nitrocarburizing

Properties of aluminum alloys are:

Cobalt based superalloys:

Physical Vapor Deposition (PVD):

Malleable irons:

Nickel alloys are:

Stainless steels can be divided into:

Main categories of PVD processes are:

Cementite

Ausforming:

Hardenability depends on:

Eutectic:

Grain size

Eutectic reaction

Purposes of heat treatment are

Vacuum carburzing:

Jominy distance is:

Austenite:

Nitriding of steels

Proprties of titanium alloys are

Iron based superalloys:

Gray cast irons:

Critical resolved shear stress:

Precipitations taking part in material strengthening should be:

Dislocation density

Hardenability depends on

Recovery:

Mechanisms of diffusion are:

Nickel-iron based alloys

Microsegregation:

Cementite

Annealing:

High strength low alloy steels (HSLA):

Dispersion strengthening

Pack carburizing :

Slip in crystals:

Marquenching is:

Ausforming is:

Ferrite:

Martenistic transformation

Normalizing

Recovery

Mechanisms of diffusion are:

Hume-Rothery rules are:

Nitrocarburizing

Iron based superalloys:

Copper alloys are:

In steels:

Slip system

Annealing

Dispersion strengthening

Solvus is a :

Recristallization: