Question

Question 4: A cylindrical specimen of cold-worked copper has a ductility (%EL) of 25% What is its tensile strength? (a) (b) If its cold-worked radius is 10 mm, what was its radius before deformation? 70 140 120 900 800 1040 Steel 60 120 1040 Stee 800 700 100 50 700 600 100 80 40 600 500 Brass Brass 80 30 60 400 500 Brass 20 Copper 40 300 60 400 Copper 10 1040 Stee 200 300 40 20 Copper 100 0 0 200 0 10 50 60 Percent cold work 20 30 40 70 0 10 20 30 40 50 60 70 10 20 30 40 50 60 70 Percent cold work Percent cold work Exercise 5: Consider 2.5 kg of a steel containing 0.65 wt% C, cooled slowly to room temperature. a. What is the proeutectoid phase? b. How many kilograms each of total ferrite and cementite form? c. Schematically sketch and label the resulting microstructure.

Answer 1

Maturial Copper SpscimEnhape indical (EL) 25 (a) Ten sile treng t f1st have to Fnom thi from th calculate thu purcant cold wonk 3rd en gaph betwe en /.EL vs /, cold rk (7. EL)= puCantcold onk and coppur matorial Fon - Nas from nd zen h and Coppur matni al ) Tensile styh a o MPap pronimdtrd frm ven 1adins,k= l0mm (b) wonlke cold ane is th A. _2 314 mm (10) 2. twkeol cold have oe A 10O A, /.Co wnk 314 X100 2- = lo.S4 m m hadius befo defomtion

e5 72 3 C T 0.018 C C0.73

2.5KY Co that Ca) Fnom tu phore Cen Seo we steel composition Сo< Сy frecute cto idl Со is Yhin p1oeudecbid phaa and this ph is fonmud phare (1 phaar (b) Am ount of farvute CFegc Со X m Cod 6. 67 O.6S O.o18 6.67 JNa 2.26 cemertite Am ountt - 2.5-2 2 6 Wa 0.24 WFe3 C

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r0decoidlfite phare entit cem phare forrits pha