Copper and copper alloys as specified by the Copper Development Association (CDA) and are designated as C00001 thru C99999 in the Unified Numbering System (UNS).  True  False An alloy steel designated as AISI 4130 WQT 700 means: chromium-molybdenum alloy steel containing .30% carbon in solution, that is through heat treated and water quenched.

Question 4 A segment of the Fe/C alloy phase diagram is shown below: Composition (at% C) 15 Temperature (°C) 0 1600 1400 1200 1000 800 600 400 1538°C 0 (Fe) 8 Y 912°C -1493 C 1394-C Y. Austenite 0.76 0.022 a, Ferrite 1 y+L 2 2.14 10 1147 C at Fe₂C L 4.30 Y+Fe3C 4 3 Composition (wt% C) 727°C 20 Cementite (Fe-C) 5 6 25 2500 2000 1500 1000 6.70 Temperature (°F) a) What are the equilibrium phases, compositions and relative fractions of the Fe-C alloy at an average composition Ccarbon of 2% and a temperature of 730 °C? b) What are the equilibrium phases, compositions and relative fractions of the Fe-C alloy at an average composition Ccarbon of 2% and a temperature of 725 °C? 7 c) Sketch the microstructure of the alloy obtained by quick cooling of the alloy from the conditions in part a) to the conditions in part b). Be sure to identify the phases in your sketch.

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1600 Question 4. An austenitized 4340 standard steel bar is cooled at different rates (see Figure 2). 0.41 C,0.87 Mn, 0.28 Si, L.83 Ni. 0.72 Cr, 0.20 Mo 12.7 mm 4340 25 mm 800 mm 19 mm Austenitized at 1550F (843 C) Grain size: ASTM No.7 Acy: 1390'F (754 C) Ac: 1330'F (721'C) Predict what will be the constituents in the 1400 Va in. microstructure of the bar at 200°C for the 6.3 mm 700 76 mm following cooling rates: 1200 9.5 mm Cooling curves from 1550'F (843 C) at indicated distances from quenched end mm 600 (a) 5°C/s (51-mm from the quenched end of a Jominy bar) (b) 8°C/s (19.0-mm from the quenched end of a Jominy bar) (c) 50°C/s (9.5-mm from åe quenched end of a Jominy bar) E 1000 |500 800 400 Transformed 600 No% 300 M+A 400 200 200 100 1000 10 20 50 100 200 500 Cooling time (s) Figure 2 Temperature (F) Temperature (C)

In this Sn-Pb alloy system, what is the relative percentage of proeutectic alpha phase after alloy 2 is cooled down from 300 °C to room temperature? Alloy 2 Alloy I 327 Solidus Liquidus 300 Liquid Liquidus 250 a + liquid Solidus 200 B+ liquid 183 Eutectic point 150 Solvus +B 100 Solvus 50 19.2 40.0 61.9 97.5 li 60 10 20 30 40 50 70 80 90 100% 100% Weight percent tin Sn Pb O1. 73% O II. 51% O II. 49% O IV. 27% Temperature (C),