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 700c 170 70 31 18 9 5.6 270170 70 31 18 9 60 3.9 C 5.6 3.9 28 100 100 50 4340 Surface 40 4140 50 Center 8640 30 5140 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 lmm) 75

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 700c 170 70 31 18 9 5.6 270170 70 31 18 9 60 3.9 C 5.6 3.9 28 100 100 50 4340 Surface 40 4140 50 Center 8640 30 5140 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 lmm) 75

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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Please draw each scenario using the TTT diagram
A ductile cast-iron bar is to support a load of 178 kN in a heat-treating furnace used to make malleable cast iron. The bar is located in a spot that is continuously exposed to 500°C. Design the bar so that it can operate for at least 10 years without failing.
Q4: Answer with True or False: 1-Cooling rate when quenching steel in agitated water is faster than brine. 2-Normalizing can be done for hypereutectoid steels by heating the steel above Acm. 3-Marquenching of the hardened steel sometimes causes quench cracks. 4-New carbides type begins to form after tempering AISI 1020 steel after 100°C. 5-Recrystallization temperature decreases with increasing the percentage of prior cold work. 6-Steels are categorized depending on their microstructure and how they've been heat treated. 7-Annihilation of dislocations, polygonization is commercially done by recrystallization annealing 8-Process annealing for cold worked for AISI 1040 steel includes heating the steel to 650°C. 9-Carbon content increases martensite start and finish temperatures. 10-Retained austenite is more at center than surface of a quenched part.
For each question, provide an explanation, identifying the correct choice ( it is marked in red) and explaining why it's the right answer, as well as why the other options are incorrect. Please do 1, 2.
Answer this please important
1. Determine working stresses for the two alloys that have the stress–strain behaviors shown in Figures 6.22.
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Give the correct answer with explaination.