MECE 3345 - Sample Exam03 (Winter 2016) Filled In

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Lone Star College System, Woodlands *

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MECE3360

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Mechanical Engineering

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Oct 30, 2023

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1 Sample Exam #3 MECE 3345 Materials Science Family (Last) Name: ________________ Given (First) Name _________________________ UH ID#: _________________________ Instructions x Leave these sheets stapled together during the exam. x Do not look at any pages of the exam (except this one) until I tell you to begin at 2:00 PM. x PRINT your name on the exam (above) now. x IF you have questions, stay in your seat and raise your hand. I will come to your seat to discuss the exam. x Separate sheets have equations and constants for your use in solving the problems on the exam. x No programmable calculators with pre-programmed equations should be used in this exam – It has to be reset before the exam. x Turn off all cell phones, smart phones, iPads, etc. x Write legibly – if I cannot read it, you will get no credit. x The exam will end at 5:00 PM. Read all the problems carefully and thoroughly before you begin working. Good luck!

1. D p 2. C 3. D s s 4. A c 3 b 5. A l f 6. A ( ( ( ( ( 7. D f 8. A c ( Determine th platinum ( R = Cite the relat Describe in strengthening strengthening A cylindrica circular cros 380 MPa (55 be 7.5 mm (0 A cylindrical load amplitu failure will n A copper-nic (2370 q F) (a) At what t (b) What is t (c) At what t (d) What is t Describe the for solidifica A 90 wt% A composition (a) The temp he expected = 0.1387 nm tive Burgers your own w g, and strain g techniques al rod of bra s section wi 5,000 psi) an 0.30 in). Ex l 1045 steel ude is 22,000 not occur. N ckel alloy of temperature he composit temperature he composit difference o ation. Ag-10 wt% of the liquid perature of th diffraction a m) when mon vector–dislo words the thr n hardening s. ass originally ill be mainta nd a ductility plain how th bar is subjec 0 N (4950 lb No need to co f composition does the firs tion of this li does comple tion of the la of microstru Cu alloy is d phase is 85 he alloy angle for the nochromatic ocation line ree strengthe g). Be sure y 10 mm (0 ained during y of at least his may be a cted to repea b f ), compute onsider safety n 70 wt% N st liquid phas iquid phase? ete melting o ast solid rem ucture of soli s heated to 5 wt% Ag, d 2 e first-order radiation of orientations ening mecha e to explain 0.39 in) in d g deformatio 15 %EL are ccomplished ated compres the minimu y factor in th i-30 wt% Cu se form? ? of the alloy o maining prior ids in Ni-Cu a temperatu etermine: reflection fr f wavelength s for edge, sc anisms (i.e., how disloc diameter is t on. A cold-w e desired. F d. ssion-tensio um allowable he calculatio u is slowly h occur? to complete u alloy with ure within th rom the (11 h 0.1542 nm crew, and mi , grain size cations are i to be cold w worked tens Furthermore n stress cycl e bar diamet on. heated from e melting? equilibrium he β + liqu 3) set of pla m is used. ixed dislocat reduction, s involved in worked by d sile strength , the final di ling along it ter to ensure a temperatur cooling and uid phase reg anes for FCC tions. solid-solution each of the drawing. The in excess o iameter mus s axis. If the e that fatigue re of 1300 q C d fast cooling gion. If the C n e e f st e e C g e

Samper Exam Tree l l Prolonem 16 Homework 1 i a RB co 1387358 0.3923 nm 2 da nation i 0.1183mm always mall angle by 21 atthe very end co is42 3 sin 20 5 247 2 33 0.652 sin co 6523 40.69423 81.3800 2 sin i g 20.652 gives domain error a r 2 Burgers Vector dislocations describe HW 01 Prob 20 edge the burger's vector is perp to the dislocation line screw the vector is parallel to the dislocation line mixed mix of the previous 2 types 3 strengthening mechanisms CHWO2 Prob 16 Grain size Reduction By reducing the size of grains it is harder for a dislocation in one plane to trigger an adjacent grain solution Hardening By adding material to anothercarbon iron there is a reduction in intersticial space which forms a stronger crystalline struct strain Work hardening Increases dislocation density via plastic deformation b c of multiplication Aug dist between didoes decreases and they start blocking Etten Precipitation Hardening increases yield strength of materials Mixing certainmaterials in certain proportions increases the number of dislocations and impeding 5 defeat propagation 4 sample Exam 02 Prob 8 do _o.am de ooosm re 15 Ra t TNT 5 0.4375or 43.75 12A CW 30 area init procicanea init area 1 as xi FUCKING de 0.00834 m do s 4610 s Af EL alot t KLIK to RA to RA s4 ws Tol5oE iqqo KNOW

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5 sample Exam 02 Problem 13 from actual Exam 2 QB dont know if thisisright aides 310M Pa 141 SN carve shit men i cycles to failure Isi iii o.o IE.to st ss.a t tiaInum Fdue a 4m.my A 2 40 Ksi 40kSI.n cycles a 8 103 cycles soc so HW 03 Prob 6 13 2 30 Iasi 6 a first liquids a 1340 C 301451in cycles sxioscycles b composition 59wt Ni 4h 1 La c complete melting 1375 C d composition of last solids 80wtNi20wt Ca c d a b CNET 7 equilibrium cooling allows for a more homogeneous diffusion of the mixture nom equilibrium fast cooling produces gradient diffusion a ofthe Ni the gradient has different concentrations of Ni with the highest concentrations fear the center of the nuclei emanating from nucleation sites 8 HW 03 Problem 8 a about 840 C b 95wt Ag Swt Cu c up E.IE 9E8I o.saooWL o.s emo 1 k asaoas

( ( 9. D 10. D 11. D ( 12. U 1 p t t ( ( ( ( 13. .N c ( ( ( (b) The comp (c) The mass Describe diff Describe eut Describe ki (undercoolin Using the is 10.22), speci percentages treatments. I temperature (a) Cool rapi (b) Cool rapi (c) Cool rapi (d) Cool rapi Name the m completely tr (a) 200°C/s, (b) 100°C/s, (c) 20°C/s. position of th s fractions of ference of m ectic, eutect inetics of ng) condition sothermal tra ify the natur of each) of n each case long enough idly to 700°C idly to 400°C idly to 400°C idly to 400°C microstructura ransformed t and he β phase f both phase microstructur oid, and per diffusional ns. ansformation e of the fina f a small s assume that h to have ach C (1290°F), C (750°F), h C (750°F), h C (750°F), h al products o to austenite, s res eutectic, h itectic reacti phase tran n diagram f al microstruc pecimen tha t the specime hieved a com hold for 10 4 hold for 2 s, t hold for 20 s, hold for 200 of eutectoid then cooled 3 hypoeutectic ions. nsformations for an iron– cture (in term at has been en begins at mplete and ho 4 s, then quen then quench , then quench s, then quen iron–carbon d to room tem c, and hyper s at low, –carbon allo ms of microc n subjected 760°C (140 omogeneous nch to room h to room tem h to room te nch to room t n alloy (0.76 mperature at reutectic allo medium, a oy of eutecto constituents to the follo 00°F) and tha s austenitic s temperature mperature. emperature. temperature wt% C) spe t the followin oys. and high oid composi present and owing time– at it has been structure. (16 e. . ecimens that ng rates: (3 p supercooling ition (Figure approximate –temperature n held at thi 6 points) are first points) g e e e s

9 Eutectic striped alternating layers of alpha t beta hypo eutectic splotchy mixture of mostly a grains and lamellar sheets of diffused eutectic mixture hyper eutectic splotchy mixture of mostly 13 grains and lamellar sheets of diffused eutectic mixture 10 Eutectic reaction phase transformation of liquid intotwo different solids Eutectoid one solid phase transforms intotwo different solids Penitectic liquid and one solid phase transform into a second solid phase 11 kinetics of diffusionalplanes Lecture 20 Phase Transformations I low larger grained microstructuresformed due to lower cooling rate leads to higher diffusion rates medium coarse grain structure high very fine grain structure and diffusion rate decreases In 12 a so Iso Pearlitel Martensite b 100 Martensite c solso Bainite Martensite 1 d 100 Bainite B apffgf.Y.tmsano.eu eeatectic steel cooling rates b Martensite I Pearlite Mix c too Pearlie Al I soo cos n aous 14 Lecture 23 Metal Alloys Slide 4 low carbon coast c high ductility low strength med carbon o aswt o6wt e medium ductility and strength bolts crankshafts etc high carbon obut Hut c high strength and very brittle high alloy 1.4W 1 C enormous tensile strength used in turbinesfurnaces rockets etc extremely brittle

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14. C 15. D Compare the Describe pre e mechanical ecipitation ha l properties o ardening. of major mic 4 crostructures of carbon steels.

15 Precipitation Hardening Lecture 23 slides Slide 9 1 solution heat treat get a solid solution 2 Quench to room temp retain a solid solution 3 reheat to nucleate small 13 particles within a phase