Heat is removed from a molten metal of mass 2 kg at a constant rate of 10 kW till it iscompletely solidified. The cooling curve is shown in the fig.1100(0 s, 1023 K)1000-900-(20s, 873 K)800-(10s, 873 K)700600-(30 s, 600 K)50010203040Times (s)Assuming uniform temperature throughout the volume of the metal duringsolidifications, the latent heat of fusion of the metal (in kJ/kg) is –-Temperature (K)

Given, Mass = m = 2 kg Power = W˙ = 10 kW From the given graph, it can be seen that phase change…

Answered: Heat is removed from a molten metal of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

During zone melting process, the molten zone of a Cu-Ni alloy bar has the initial composition marked by point "B" in the phase diagram. Referring to the righthand side drawing, the power of the heater (induction coil) was on when it travels from left end to right end so that zone melting happened. The power was off when the heater translated fully back to the left side to keep the entire bar in solid state. The heater passed the bar from left to right four times, what is the wt.% of Ni at the left end of the bar. Temperature (°C) 1600 1500- 1400 1300 1200 1100 1000 1085°C 0 (Cu) I Liquid Liquidus line 20 L B a+L a Solid solution 40 Composition (wt% Ni) 60 1 1453°C 80 Solidus line 2400 2800 2600 2200 2000 100 (Ni) Temperature (°F) heater- cooled solid ↑ unmelted solid molten zone
Brittle Dune Buggy Parts A mechanic who was building a lightweight dune buggy needed some high-strength aluminum parts. Since he had access to a heat-treating furnace, he decided to do the solution heat-treating and aging process himself. He obtained 2024 aluminum bars and made the parts. Then her heat treated the part in a furnace to 1200 deg F., quenched them, and allowed them to age naturally. He noticed they had small blisters over their surfaces and when he began to hammer one in place, it broke in two places. What did he do wrong? Could the parts be salvaged in any way?
9-56 Sketch a cooling curve for a pure metal and label the different regions carefully. 50 30 46 25 Tensile strength 20 38 15 10 G Elongation 30 5 26 0.005 0.010 0.015 Secondary dendrite arm spacing (em) Figure 9-7 The effect of the secondary dendrite arm spacing on the properties of an aluminum casting alloy. (Repeated for Problem 9-55.) Tensile strength (ksi) % Elongation
A 44-mm diameter cylindrical steel specimen is to be heat treated such that the microstructure throu will be at least 50% martensite. We are to decide which of several alloys will satisfy this criterion if the quen medium is moderately agitated (a) oil, and (b) water. Cooling rate at 700°C (1300*F) Cooling rate at 700°C (1300°F) 7 "Fis 3.9 °Cs 305 125 56 33 16.3 10 305 125 56 33 16.3 10 7 "F/s 9 5.6 170 70 31 18 170 70 31 18 9 5.6 3.9 "Cs 100 100 Surface 75 75 Surface Center 50 Center Center 25 R Surface 10 30 mm 10 20 30 mm 1j in. 1 1 in. Equivalent distance from quenched end Equivalent distance from quenched end water quenching oil quenching Cooling rate at 700°C (1300°F) 490 305 125 56 33 16.3 10 5.1 3.5 °F/s 270170 70 31 18 60 2.8 2 °C/s 9 5.6 3.9 -100 50 4340 80 40 4140 8640 30 5140 1040 20 10 20 30 40 50 mm 1 1 1 2 in. 4. Distance from quenched end Hardness, HRC Diameter of bar (mm) 20 m14 Diameter of bar (in.) Diameter of bar (mm) 1/2 m/4 Percent martensite Diameter of bar (in.)
Quenching is a process used to preserve at room temperature a phase which exists in equilibrium at high temperature but which would decompose during equilibrium cooling. Explain the basis of this process in the precipitation process and martensitic transformation. Use phase diagrams when necessary.
(a) Figure 5 shows a phase diagram for the Nb-80 wt% W alloy which is solidified under under the nonequilibrium condition. Evaluate (i) the liquidus temperature (ii) the non-equilibrium solidus temperature (iii) the freezing range (iv) the composition of the first solid form during solidification (v) the composition of the last liquid to solidify (vi) the phase(s) present, the composition of the phase(s) and the amount of the phase(s) at 3000 °C (vii) the phase(s) present, the composition of the phase(s) and the amount of the phase(s) at 2800 °C.
A 1.5-kg specimen of a 88 wt% Pb-12 wt% Sn alloy (Animated Figure 9.8) is heated to 220°C; at this temperature it is entirely an a- phase solid solution. The alloy is to be melted to the extent that 50% of the specimen is liquid, the remainder being the a phase. This may be accomplished either by heating the alloy or changing its composition while holding the temperature constant. (a) To what temperature must the specimen be heated? i °C (b) How much tin must be added to the 1.5-kg specimen at 220°C to achieve this state? i kg
To increase hardness of steel gear, it was carburized at 1040°C by introducing 1.5%C at its steel surface. What will be the final carbon content 0.0014 m beneath the surface if this treatment was lasted for 12 hours. The initial carbon content of steel is 0.1%C. (gas constant is 8.31 J/mol K).
None
(a) A spherical casting of diameter 10 cm has a cylindrical riser 5 cm in diameter and 10 cm high. Predict with suitable explanation whether the riser can prevent macroporosity in the casting based on calculation applied to the riser design.
Need step by step defination please
Show the complete and organize solution. Write your answer with four decimal places and enclose them in a box please follow this format Given, Required,solution thank you!!

SEE MORE QUESTIONS

Recommended textbooks for you

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Control Systems Engineering

Mechanical Engineering

ISBN:

9781118170519

Author:

Norman S. Nise

Publisher:

WILEY

Mechanics of Materials (MindTap Course List)

Mechanical Engineering

ISBN:

9781337093347

Author:

Barry J. Goodno, James M. Gere

Publisher:

Cengage Learning

Engineering Mechanics: Statics

Mechanical Engineering

ISBN:

9781118807330

Author:

James L. Meriam, L. G. Kraige, J. N. Bolton

Publisher:

WILEY

SEE MORE TEXTBOOKS