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

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The cooling rate (in °C/s) at the center of a shaft with diameter d (in mm) is given by the following formula log 10(CR) -1.8024 log 10(d) + 4.0565 %3D and the critical cooling rate (CCR in °C/s) of low alloys steels is given as a function of amount of alloying element (in wt%6) as follow. log 10(CCR)= 4.3-3.27×C- (Mn + Cr+Mo+ Ni) 1.6 Find the maximum diameter (in mm) of a shaft to be made of alloy A (such that 100% martensite will be produced after quenching) from the following table is given below: Alloy Weight Percentage (wr%) Mn Cr Mo Ni A 03 08 05 02 055 0.4 0.6 1.2 0.3 5 0 36 0.7 15 255 0.4 06 12 0.15 5 0 41 0 85o 5 o 25 o s5 04 0.65 0 75 0 25 p.85
There is a strong correlation between microstructure and mechanical properties of metal alloys. This relationship forms the basis in the study of phase diagram and Time- Temperature Transformation (TTT) diagram. As an engineer, you are expected to apply the concepts in design and control of heat-treating procedures. In one heat treatment of steel AISI1OXX, where XX refers to the last two digits of your student identification (ID) number, it was heated at 1200°C and then very slowly cooled to 600°C. Describe the microstructure development that occurs during this heat treatment providing sufficient details on the phases present, composition, amount, relevant microstructure representation including their mechanical properties, at each phase region transversed. Propose a suitable application of this steel alloy and name this type of alloy and composition.
A large slab of steel at a uniform tempering temperature of 200°C and suddenly quenching, and it surface temperature lowered to 70°C. calculate the required time when the temperature at a depth 4.0 cm has dropped to 120°C? Given: steel [k =45 W/m°C, a=1.4×10-5 m²/s, c=0.46 kJ/kg]
1- A large slab of steel at a uniform tempering temperature of 200°C and suddenly quenching, and it surface temperature lowered to 70°C. calculate the required time when the temperature at a depth 4.0 cm has dropped to 120°C? Given: steel [k =45 W/m°C, a=1.4x10 m²/s, c=0.46 kJ/kg]
What is a solid solution? In general, what is its implication on the mechanical behavior of metals (i.e., increase or decrease in strength)?
80 kg of aluminum is to be heated to a pouring temperature of 750°C. The unit melting and pouring energy of the metal = 1035 J/g. Thermal efficiency of the furnace = 65%. How much time is required to heat the metal from 25°C to the pouring temperature if the electric induction furnace generates 100 kW? p x T = 21.23 min
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Imagine a substance with a melting point of 13°C and boiling point of 127°C. At a temperature of 350 K, in what state of matter would you expect to find this substance?
Hi please present the solution clearly (preferabely on paper) with all steps so it is easier to understand since I have asked this question multiple times and I still don't get it. Thank you!
The isothermal transformation diagram for and iron- carbon alloy of eutectoid composition is given in figure. Specify the nature of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case, assume that the specimen begins at 760°C. Show your work on the diagram. a. Cool rapidly to 300°C, hold for 5 s. b. Cool rapidly to 600°C hold for 100 s, then quench to room temperature. C. Cool rapidly to 500°C, hold for 7 s, and then quench to room temperature. Temperature (°C) 800 700 600 500 400 300 200 100 0 -1 10 6 A A A M(start) M(50%) M(90%) 1 10 M-A Eutectoid temperature P 10² Time (s) B 50% 10³ 104 105
It has been found that 'pyrex' cookware made of borosilicate glass does not shatter during baking or cooking around 300°F. However, shattering of cookware made of soda-lime-silicate glass was frequently reported during the years 2012-2013. Find and explain the possible reasons for cookware shattering. Show your calculation. Assume that the cookwares are free of pores, cracks, and scratches. Given: Material/properties Borosilicate Soda-lime-silicate glass glass Thermal expansion coefficient (x106/°C) Elastic modulus (GPa) Failure stress (MPa) 3 9. 62 68 30 30
A 30% ethylene glycol solution in water is gradually cooled. At what temperature in degree celsius does crystallization begin?

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