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MATSE 259 - Exam 3 Questions and Answers Latest Update 2025 Graded A+
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MATSE 259 - Exam 3 Questions and Answers Latest Update 2025 Graded A+ Simple Diffusion Dependent Transformations - Answers No change in number or composition of phases present Diffusion Dependent Transformations - Answers Alterations in phase compositions and number of phases present Diffusionle...

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  • January 26, 2025
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  • 2024/2025
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MATSE 259 - Exam 3 Questions and Answers Latest Update 2025 Graded A+

Simple Diffusion Dependent Transformations - Answers No change in number or composition of phases
present

Diffusion Dependent Transformations - Answers Alterations in phase compositions and number of
phases present

Diffusionless Transformations - Answers metastable phase, diffusion is very slow, a new phase

Two Types of Phase Transformation Stages - Answers Nucleation (small particles) & Growth (increasing
the size, parent phase disappears)

Two Types of Nucleation - Answers Homogenous (uniform throughout parent phase) & Heterogenous
(structural irregularities, container surfaces and insoluble impurities)

What is the rate of transformation? - Answers 1/t(0.5)

Phase Transformations - Answers 1. crossing boundary in phase diagrams

2. during transformation - alloy proceeds to equilibrium

3. but most take time - heat treatment and microstructure

4. in reality we cool rapidly and get intermediate phases

Pearlite - Answers 1. austenite to alpha + Fe3C

2. Higher temp- coarse pearlite Lower temp- fine pearlite

Bainite - Answers 1. diffusion is involved

2. appear like plates and needles

3. thickness depends on temp

4. after nose on diagram

If some portion forms into pearlite or kainite, what must happen before transforming into another
microconstutuent? - Answers Must reheat back to Austenite

Spheroidite - Answers 1. heating pearlite or bainite just below eutectoid for long period (24 hr)

2. Fe3C spheres

Martensite - Answers 1. rapidly cooling to very low temperatures

2. not enough time for diffusion (diffusionless)

, 3. Cools without passing through transformation curves

4. Body Centered tetragonal (supersaturated, transform into another structure, diffusionless)

5. Appears of sharp plates and needles,

6. Retain Austenite can exist

7. DOES Not appear on phase diagram

Alloy Steels - Answers 1. Plain Steel - If carbon is only alloying element

2. Alloy Steel - If you add Cr, Ni, Si, or Mn

3. They shift isothermal curve and delay

Continous Cooling Diagrams - Answers 1. Time is required for reaction to begin and end

2. Isothermal curves are shifted to larger time and lower temps

Critical Cooling Rate - Answers The minimum rate of quench that produces totally martensite structure

How to Increase Mechanical Behavior? - Answers 1. Increase carbon content (more Fe3C, stronger, yield
and UTS)

Rank the microstructures that can be produced by quenching the eutectoid of Austenite - Answers
Martensite

Tempered Martensite

Fine Bainite

Coarse Bainite

Fine Pearlite

Coarse Pearlite

Spheroidite

Tempered Martensite - Answers 1. martensite after quenching is very brittle

2. increase in ductility and toughness by tempering

3. Almost as hard/strong as martensite but better ductility

4. If over tempered, becomes spheroidic

Temper Embrittlement - Answers 1. when impact test shows a reduction in toughness of the tempered
steel

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