Solve this problem and show all of the work 5-38 We can successfully perform a carburizing heat treatment at 1200 °C in 1 h. In aneffort to reduce the cost of the brick lining in our furnace, we propose to reducethe carburizing temperature to 950 °C. What time will be required to give us asimilar carburizing treatment?

We were to be given the activation energy is given as Q = 32, 900 cal/mol and the gas law constant…

Answered: 5-38 We can successfully perform a…

Welding: Principles and Applications (MindTap Course List)

8th Edition

ISBN:9781305494695

Author:Larry Jeffus

Publisher:Larry Jeffus

Chapter26: Welding Metallurgy

Section: Chapter Questions

Problem 14R: Approximately how many degrees wide is the transition range at the 0.1 carbon alloy?

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11-42 Cooling curves are obtained for a series of Cu-Ag alloys (Figure 11-33). Use this data to produce the Cu-Ag phase diagram. The maximum solubility of Ag in Cu is 7.9%, and the maximum solubility of Cu. in Ag is 8.8% The solubilities at room temperature are near zero. 1200 S0% Ag 71,9% Ag 1100 1000 100% Ag 900 J00% Cu 90% Ag 800 84 A 20% Ag 700 Time Figure 11-33 Cooling curves for a series of CurAg alloys (For Problem 11-42). Temperature (C)
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Q3: With a moderately agitated water, a cylindrical piece of steel with 80 mm diameter is to be quenched. The hardnesses of the surface and center must be at least 55 and 40 HRC, respectively. Which of these alloys will satisfy the following requirements: 1040, 5140, 4340, 4140, 8620, 8630, 8640, and 8660? Cooling rate at 700c Cooling rate at 700°c 170 70 31 18 5.6 3.9 "C 270 170 70 31 18 9 60 2 "Os 5.6 3.9 2.8 100 100 50 4340 80 75 3 Surface 40 4140 Center 8640 30 5140 25 1040 20 10 20 30 40 50 mm 10 20 30 mm Distance from quenched end Equivalent distance from quenched end Figure 3 Figure 4 Hardness, HRC Percent martensite Diameter of bar (mm)
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Q1 / Two metals Beryllium (Be) and Silicon (Si) have melting points 1282°C and 1414 °C respectively, are completely soluble as liquids but completely insoluble as solids . They form a eutectic at 1090°C containing 61 wt% Si -39wt% Be? Determine the following:- 1- Draw the thermal equilibrium phase diagram and identify all phases are present in diagram ,then sketches what happens in microstructure when the alloys containing , a- 10wt% Si, b-70wt%Si , solidify completely. 2- Determine the composition and the amount of each phase for the alloy which contain 15 wt% Si-85wt% Be at 1150°C If the alloy is hypoeutectic determine the amount of eutectic at 600 °C? or hypereutectic and
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