ch09_3_Th - Chapter 9 Phase Diagrams ISSUES TO ADDRESS...

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Chapter 9 - 1 ISSUES TO ADDRESS. .. Chapter 9: Phase Diagrams Microstructural development during slow cooling Simple binary phase diagram Eutectic phase diagram Eutectoid phase diagram Iron phase diagram
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Chapter 9 - • Slow rate of cooling: Equilibrium structure • Fast rate of cooling: Cored structure First B to solidify: 46 wt% Ni Last B to solidify: < 35 wt% Ni 2 Cored vs Equilibrium Structures Uniform C B : 35 wt% Ni
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Chapter 9 - Figure 9-32 (50%) (46%) (89%) T (90%) Simple Binary Phase Diagram
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Chapter 9 - 4 wt% Ni 20 120 0 130 0 3 0 4 0 5 0 110 0 L (liquid) B & (solid) T (ºC) A 35 C 0 L : 35wt%Ni Cu-Ni system • Phase diagram: Cu-Ni system. • Consider microstuctural changes that accompany the cooling of a C 0 = 35 wt% Ni alloy Ex: Cooling of a Cu-Ni Alloy 46 35 43 32 B : 43 wt% Ni L : 32 wt% Ni B B : 46 wt% Ni L : 35 wt% Ni C E L : 24 wt% Ni B : 36 wt% Ni 24 36 D C B changes as we solidify. Cu-Ni case: First B to solidify has C B = 46 wt% Ni. Last B to solidify has C B = 35 wt% Ni.
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Chapter 9 - A Eutectic Composition
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This note was uploaded on 10/03/2011 for the course EMCH 371 taught by Professor Dai-hattrick during the Spring '11 term at South Carolina.

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ch09_3_Th - Chapter 9 Phase Diagrams ISSUES TO ADDRESS...

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