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Q5F02 - rm EN SC 3313 Fall 21101 A l Hame Quiz 5 nswer an r...

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Unformatted text preview: rm EN SC 3313, Fall 21101 A l. Hame_ Quiz 5 nswer an r 4 uestions on] r, 1 point each to a 5 mm diameter rod. The final at a hardness lCl mm diameter eopper rod is to be drawn down a, an elongation {St} mm} P 15%. but A cold drawn produet must have a tensile strength “a 325 MP '1 l til Bl—IN. Specify a processing seuuenee. Tensile Mb, I.an Hardness st llfi Need s: 40% CW Elengation 3a 15% '1'3 1‘:- 325 MPH. Need if. 35"n CW Heed 3* 39% CW Cheese w 32% (SW, for final stage. I Need a w before final stage of ass: d . Need Ll '— Gflfi mm Red is cold dranrn initially, sea nun, thenee anneal and CW 32% 32%. .tlti mm by eold worklanneal stages to hence anneal and reduce d to En 0 min to a.an mrn, thenee CW gr, bet work red'from 1 Explain elearl},r why given a sample of pure annealed copper {melting point lflE3DC) of average grain size ELI mrn, you eannot reervstalliae it by placing it in a fnrnaee at 730°C for 1 hour. How eenld you recrystallize it? ample is to put it into the fullv soli state. The fltealid sample is in the Full}; no driving three for reervstallization. Thus the rvstallisation could occur. To recrystallize s s soft state alreadv; there is no stored energy, sample would need to be eold worked before ree metal alloy being eat in both instances. Aeeount for the differenee in behavior! ‘Wllieb It is the same is more desirable for machining? eondition, (a) or {b}, (b) is annealed. {a} is eold worked metal. (a) is more desirable for machining as less Wfll'k is needed to fi‘aeture a brittle material. on Fig. til—em 1I'hva entitling. et I'Ml'fll turnIn-aa try a meant-nu tuol. 1.?! 4. I showed this diagram on the. overhead projector. a} What is the label for the vertical ams‘? h] What type of'hehavior is this diagram illustrating? a} Strain {E} a h} Creep EIIEI" . 5. I showed this diagram on the overhead projector. a] What is the label for the horizontal axis? h) Name a material that would exhibit this type of behavior. a] 'l'empcraturc MAC!" TESTS h} Steel, or another BCC metal such as tungsten. — II mintnmmm'r ml: "' IBIL‘flI-“T INTI? “HAWK M + WWW” it. Please provide an exEIatmtflfl caption for this figure, pertaining to failure. The theme is metal fatigue. 'l'hese three products all undergo repetitive loading. If the applied stress is too high, they will eventually,F fail by metal fatigue, following the initiation and gradual propagation of cracks. The consequences can be disastrous. The first commercial jet aircraft, the British "Comet" had to be withde from service because of fitselage fatigue. ...
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