To produce martensite, do you need to use a very slow cooling rate? Why or why not ?
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Q: What is the critical value of G to avoid constitutional supercooling for the directional…
A: Solution: Given Data: v = 0.05 mm/s k = 0.14 m = -2.6oC/wt% D = 3X10-5 cm2/s C = 3 wt%
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To produce martensite, do you need to use a very slow cooling rate? Why or why not ?
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Solved in 2 steps
- Why are Ni3Al (γ') precipitates particularly effective at strengthening nickel-based superalloys?How much time (in seconds) is required for austenite to transform to 50% bainite at 300°C?What is the critical value of G for the directional solidification of two Al-Cu alloys (one containing 3wt.%Cu, the other 5wt.%Cu) at a rate of 0.08 mm/s ? For these alloys, k=0.14, m=-2.6°C/wt% and D=3x10-5cm²/s.
- 2) The region showing planar growth during solidification near the fusion zone boundary will exhibit O High temperature gradient and high growth rate High temperature gradient and low growth rate Low temperature gradient and high growth rate O Low temperature gradient and low growth rate1 a) Briefly describe the phenomenon of coring (also known as segregation) that occurs during solidification in isomorphous alloys and why it occurs? b) Cite one undesirable consequence of coring?Is it true that Martensite is tempered because it is too strong? Why or Why not
- What are they and what is their application in the production of the following steel:Martensite temperingWhat is the critical value of G to avoid constitutional supercooling for the directional solidification of an Al-Cu alloy, containing 3 wt.% copper, at a rate of 0.05 mm/s? For these alloys, k = 0.14, m = -2.6oC/wt% and D = 3x10-5 cm 2 /s. Here G is the thermal gradient into the liquid phase, k is the partition coefficient of the alloy, and D is the diffusivity of solute in the liquid phase.(11.10) Suppose that a steel of eutectoid composi- tion is cooled to 550°C (1020°F) from 760°C(1400°F) in less than 0.5 s and held at this temperature. (a) How long will it take for the austenite- to pearlite reaction to go to 50% comple- ton? To 100% completion? (b) Estimate the hardness of the alloy that has completely transformed to pearlite? 11.12) Briefly cite the differences between pearl- rp. bainite, and spheroidite relative to crostructure and mechanical properties?