Callister - An introduction - 8th edition

S2 • Answers to Selected Problems
9.45 For point B, F 2
(c) T 465C (870F);
9.14 (a) W 0.70, W 0.30;
(d) C L 67 wt% Pb–33 wt% Mg
9.48 C¿ 0 0.42 wt% C
(c) W L 1.0;
(e) W 0.56, W 0.44;
(g) W 1.0
9.15 (a) T 295C (560F)
2.12 kg of pearlite
9.53 C¿ 0 0.55 wt% C
9.55 C¿ 1 0.61 wt% C
9.18 (a) T 230C (445F);
(b) C 15 wt% Sn; C L 43 wt% Sn
9.19 C 90 wt% A–10 wt% B; C 20.2 wt%
A–79.8 wt% B
9.21 Not possible
9.24 (a) V 0.70, V 0.30
9.30 Is possible
9.33 C 0 82.4 wt% Sn–17.6 wt% Pb
9.35 Schematic sketches of the microstructures
called for are shown here.
600°C
L (85 wt% Pb)
270°C
Mg 2 Pb (81 wt% Pb)
L (97 wt% Pb)
Mg 2 Pb (81 wt% Pb)
β (~100 wt% Pb)
500°C
L (88 wt% Pb)
200°C
Mg 2 Pb (81 wt% Pb)
9.42 Eutectics: (1) 12 wt% Nd, 632C, L → Al
Al 11 Nd 3 ; (2) 97 wt% Nd, 635C, L →
AlNd 3 Nd;
Congruent melting point: 73 wt% Nd,
1460C, L → Al 2 Nd
Peritectics: (1) 59 wt% Nd, 1235C, L
Al 2 Nd → Al 11 Nd 3 ; (2) 84 wt% Nd, 940C,
L Al 2 Nd → AlNd; (3) 91 wt% Nd, 795C,
L AlNd → AlNd 2 ; (4) 94 wt% Nd, 675C,
L AlNd 2 → AlNd 3 .
No eutectoids are present.
9.51 (a) -ferrite; (b) 2.27 kg of ferrite, 0.23 kg
of Fe 3 C; (c) 0.38 kg of proeutectoid ferrite,
9.58 Is possible
9.61 Two answers are possible: C 0 1.11 wt%
C and 0.72 wt% C
9.64 HB (alloy) 128
9.66 (a) T(eutectoid) 650C (1200F);
(b) ferrite;
(c) W 0.68, W p 0.32
Chapter 10
10.3 r* 1.30 nm
10.6 t 305 s
10.8 r 4.42 10 3 min 1
10.10 y 0.51
10.11 (c) t 250 days
10.15 (b) 265 HB (27 HRC)
10.18 (a) 50% coarse pearlite and 50% martensite;
(d) 100% martensite;
(e) 40% bainite and 60% martensite;
(g) 100% fine pearlite
10.20 (a) martensite; (c) bainite; (e) ferrite, medium
pearlite, bainite, and martensite; (g) proeutectoid
ferrite, pearlite, and martensite
10.23 (a) martensite
10.27 (a) martensite;
(c) martensite, proeutectoid ferrite, and
bainite
10.36 (b) 180 HB (87 HRB); (g) 265 HB
(27 HRC)
10.38 (c) TS 915 MPa (132,500 psi)
10.39 (a) Rapidly cool to about 675C (1245F),
hold for at least 200 s, then cool to room
temperature.
10.D1 Not possible
10.D5 Temper at between 400 and 450C (750 and
840F) for 1 h
Chapter 11
11.4 V Gr 11.1 vol%
11.21 (a) At least 905C (1660F)
11.22 (b) 830C (1525F)
11.D10 Maximum diameter 83 mm (3.3 in.)
11.D11 Maximum diameter 75 mm (3 in.)
11.D15 Heat for between 3 and 10 h at 149C, or
between about 35 and 500 h at 121C