(1 hr.) ,then cooling as the (TTT diagram) as below. find the final structure for each sample. 1- rapid cooling to room temperature. 2- rapid cooling to (690 C) and hold to( 2 hr.), then, rapid cooling to room temperature. 3- rapid cooling to (610 C) and hold to( 3 min.), then, rapid cooling to room temperature . 4- rapid cooling to (580 C) and hold to( 2 sec ), then, rapid cooling to room temperature . 5- rapid cooling to (450 C) and hold to( 1 hr.), then, rapid cooling to room temperature . 6- rapid cooling to (300 C) and hold to( 7 min.), then, rapid cooling to room temperature . rapid cooling to (300 C) and hold to( 5 hr.), then, rapid cooling to -Y room temperature. 800 Eutectoid temperature 1400

(1 hr.) ,then cooling as the (TTT diagram) as below. find the final structure for each sample. 1- rapid cooling to room temperature. 2- rapid cooling to (690 C) and hold to( 2 hr.), then, rapid cooling to room temperature. 3- rapid cooling to (610 C) and hold to( 3 min.), then, rapid cooling to room temperature . 4- rapid cooling to (580 C) and hold to( 2 sec ), then, rapid cooling to room temperature . 5- rapid cooling to (450 C) and hold to( 1 hr.), then, rapid cooling to room temperature . 6- rapid cooling to (300 C) and hold to( 7 min.), then, rapid cooling to room temperature . rapid cooling to (300 C) and hold to( 5 hr.), then, rapid cooling to -Y room temperature. 800 Eutectoid temperature 1400

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

Q1: Austenitized 40 mm diameter 5140 alloy steel bar is quenched in agitated oil. Predict what is the Rockwell hardness of this bar will be at (a) its surface and (b) its center (c) What do you think about the difference in hardness number between the center and surface (d) Differentiate between hardness and hardenability (e) Rank the steels in the figure below from lowest to highest hardenability and explain why. Cooling rate at 700°C (°C/sec) 300 150 011/3 55 100 600 Bar diameter (mm) 80 60 40 20 0 OLL 0 0 ww 25 12.5 8 5 S -------------- M-R 10 3/4-R Agitated oil 15 20 1/4 3/4 Distance from quenched end. De (Jominy distance) 5.5 4 3 Bar diameter (in.) 0 25 mm 1 in. Hardness (Rockwell C) Where (C = center, S = surface, M-R mid-radius) 65 60 55 50 45 40 35 30 25 20 15 10 0 10 1 20 Distance from quenched end (mm) 5140 1 30 L 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Distance from quenched end (sixteenths of an inch) 4340 40 9840 4140 8640 50
Q1: Austenitized 40 mm diameter 5140 alloy steel bar is quenched in agitated oil. Predict what is the Rockwell hardness of this bar will be at (a) its surface and (b) its center (c) What do you think about the difference in hardness number between the center and surface (d) Differentiate between hardness and hardenability (e) Rank the steels in the figure below from lowest to highest hardenability and explain why. 600- Bar diameter (mm) 100 80 60 40 20 0 300 0 Cooling rate at 700°C (°C/sec). -150 55 0 تنا 25 ------- 5 S 10 12.5 8 M-R L 1/2 34-R Agitated oil 15 20 ¼ ¾ Distance from quenched end. De (Jominy distance) 5,5 54 Car Bar diameter (in.) 0 25 mm. 1 in. Hardness (Rockwell C) Where (C = center, S = surface, M-R = mid-radius) 2828 292 65 60- 55- 50 45 40 35 30 25 20 15 10 0 J 10 5140 30 20 Distance from quenched end (mm) 4340 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Distance from quenched end (sixteenths of an inch) 40 9840 4140 8640 50
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
3- The limited solid solubility Binary phase diagram has many types of reactions like and....... 4- the Crystal Structure of y (Austenite) is J. (12-1394) at 2.44 wt% has fec. 5- The maximum solubility of carbon in austenite, 2 occurs at 1147° C while the maximum solubility "wt% 0.022 W+% of BCC is At 727 oC ******* 6-steel alloys classified according to carbon conctration into.....n) and (hough). which are 7- in polymer structure the long molecules are composed of structural entities called repeat & Cham the along successively repeated and 8-polymer classified according to their molecular structure into hul (30Mark)
A 1070 steel is heated to the austenite region and air cooled. Calculate the hardness of this steel. Sketch the final microstructure...
Pls do it 30min An eutectoid steel is cooled slowly from 1000 °C to room temperature by the following different cooling rates: (i) 1 °C/s, (ii) 20 °C/s, (iii) 50 °C/s, (iv) 175 °C/s. Name the respective microstructural products for the above four cooling rates.
Consider an AISI 1045 ferrite and pearlite microstructure. The sample is initially heated to 845 deg C and quenched in water. The samples are then tempered for 20 minutes at 316 deg c, 425 deg c, and 600 deg c. Can yu tell me what would happen to the microstructure hardness os the samples as a result of quenching, tempering theory wise.
answer the following: 3) Plot the Iron-Iron Carbide phase diagram label all phases and temperatures, and a-Show the heating ranges for main heat treatments b-What are the upper and lower critical temperatures for 0.8 %C steel c-For alloy containing 3% C find the mass fraction of phases and composition in 1000°C,and 700 °C.
503 90⁰⁰ Recovery Recrystallization Grain Growth o dese d time -2. Immediately after recrystallization during annealing, this alloy was quickly cooled. Assume that cooling after recrystallization doesn't change the alloy's microstructure. The yield strength oy increased to 200 MPa after recrystallization, compared to 150 MPa which is the fully annealed state do before 80% CW. 4.2.1. What is the possible mechanism of oy → grain refinement increase? The mechanism is working hardening (cold w
For the preceding problem, use the inverse lever rule to determine the proportions of liquid and solid phases present in the alloy.
For the alloy Mg-45 wt% Pb alloy at 500 C, what is the percentage of the liquid phase?
Plot the Iron-Iron Carbide phase diagram label all phases and temperatures, = answer the following: a-Show the heating ranges for main heat treatments Label and than b-What are the upper and lower critical temperatures for 0.8 %C steel c-For alloy containing 3% C find the mass fraction of phases and composition in 1000°C,and 700 °C.