The γ phase in steel can transform into Pearlite and ____ through diffusional processes.
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The γ phase in steel can transform into Pearlite and ____ through diffusional processes.
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- 6) The y phase in steel can transform into Pearlite and through diffusional processes.What is a eutectic composition?Q17 Which of the following statements are incorrect. (multiple Answers) O (c) For precipitation hardening of metals (e.g. tool steels, Titanium alloys or Nickel alloys), the larger the precipitates, the higher the strength of the alloy. O (a) Dislocations only exist in metals O (b) The higher the temperature, the more difficult for dislocations to move within a crystal
- Which of the following is a method for strengthening metals and alloys: a. solution hardening b. full annealing c. work hardening d. incomplete casting e. cold working f. quenching g. incomplete fusionBelow is a continuous cooling transformation curve for steel (upper) and for a silicate melt (lower). Describe the similarities and differences as follows. a. What is the critical cooling rate in each case? b. What phase(s) form in each case when the critical cooling rate is exceeded? c. What phase(s) form in each case if the cooling rate is very slow? 800 1400 Ae lemperature Austenite *peorlite begins 10FI 700 1200 Austenitepearlite complete 1600 1000 5009 800 Tronsformation stops 400 600 300 400 Austenite -mortenstic structure 200 -Isathermal dogram Continuous transformaton diogrom Constant rate coding curves - 100 200 Findl structure Mortensite Morlensite i peorlile Peorite (softer, coorser- 0.1 10? 10 Tronsformation time, seconds Continuous Cooling-Transformation (C-T)Diagram (Derived from the isothermal-transformation diagram for a plain-carbon eutectoid steel) 1200 Glass Crystallization begins 1100 1000 Critical cooling rate Glass-ceramic 900 Crystallization ends 800 700 102 10…What is the% C ratio of two different steels with 80% and equal austenite content at 724 Celsius?
- 5. What is the role of austenitic gram size in martensitic transformations? Is austenitic grain size is important to the strength of martensite? What other factors are important to the strength and toughness in technological hardened steels?Draw the iron carbon phase diagram and labeling all lines and areas. Then:- 1- find the melting point of cast iron with 2.2%C. 2- explain in detail the steps of solidification and transformation of cast iron with 3%C. 3- draw the expected microstructure of iron with 0.1%C ; 0.4%C; 0.83%C; 2%C; 4.3%C. 4-draw the cooling curve for hyper steel with 1.8%C. 5- find the percentage of liquid and solid for cast iron with 3.8%C at 1160 degree Celsius with the composition for each of them.14- On the basis of accompanying isothermal transformation diagram for a 0.45 wt% C iron- carbon alloy, specify the nature of the final microstructure for the following heat treatments after austenitizing the sample at 775°C: a. Rapidly cool to about 590°C (just above the doted line), hold at this temperature for 10 s, and then rapidly quench to room temperature. b. Rapidly cool the specimen to about 675°C, hold at this temperature for 1000 s, then rapidly quench to room temperature. c. Reheat the specimen in part (b) to 700°C (1290°F) for 20 h then slowly cool to room temperature. d. Rapidly cool to about 400°C, hold at this temperature for about 1 s, and then rapidly quench to 295°C and hold for 1000 s then slow cooling. e. Rapidly cool to room temperature then reheat to 425°C for 4000 s then slowly cool to room temperature. Temperature (°C) 900 800 700 600 500 400 300 200 100 0 0.1 A A M(start) M(50%) M(90%) 1 A+ F B 10 A + P A + B *50% 10² Time (s) 10³ 104 1600 1400 1200 1000 800…
- BI (a) Figure BI below shows the equilibrium phase diagram of hypothetical A - B alloy system. Answer the following questions. (iv) Now assume a melt of Alloy B has a weight of 100 g at a temperature of 652 °C. Maintain the temperature, suggest how to make this melt become a completely solid phase (v) Based on Figure B1, briefly illustrate how to design and achieve a precipitation hardening for A-B alloy. Temperature (°C) 8 700 600 500 400 800 OA 760 °C Line B a/9.5 20 Line A a + L 650 °C 40 Liquid (L) wt%B Figure B1 52.5 a + B 60 B+L 80 93.7 B 100 BUsing the TTT diagram for eutectoid steel, draw the specified cooling path on the diagram. Indicate what phases you expect in the final product with percentage of each phase. Assume the material has been fully austenitized before cooling. a. Water cool to room temperature b. Hot quench in molten salt to 690°C and then cooled isothermally for 2 hours: c. Hot quench to 610°C hold 3 minutes and water quenchAfter quenching, the microconstituent in a steel with carbon concentration higher than 0.15 wt% is_________. This microstructure can be converted into ______ and _____ via tempering.