1.Mention four quenchants and describe how each of them affect the strength of the material being quenched arranging them in a decending ordrer. 2. Draw a typical time temperature transformation diagram showing how a material is cooled under critical cooiling rate. 3. explain non equilibrium cooling

1.Mention four quenchants and describe how each of them affect the strength of the material being quenched arranging them in a decending ordrer. 2. Draw a typical time temperature transformation diagram showing how a material is cooled under critical cooiling rate. 3. explain non equilibrium cooling

Precision Machining Technology (MindTap Course List)

2nd Edition

ISBN:9781285444543

Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Chapter2: Measurement, Materials, And Safety

Section2.7: Heat Treatment Of Metals

Problem 4RQ: What type of hardening operation that leaves the inner core in a softer condition is sometimes...

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36 Asiacell O Homework 4 -... -> 3 Class Materials Eng. Dep. Heat Treatment Ismail Ibrahim Marhoon Homework 4 Q1: 1.5 in diameter steel part is quenched in oil with no agitation. (H=0.20). If we use a 4340; 4140; 8640; 5140; 1040 steel, what would be the hardness number at the center of the part? Q2: Determine the best quenching medium to produce a minimum hardness of HRC 40 at the center of a 3.75 cm diameter 4320 steel bar. Given Cingrate t 00c00 143 to 4340 50 40 8640 ab 9310 30 4320 1050 1040 10 20 it 1 1 2n 10 20 30 Jominy distance th of an inch) Die he eted e TABLE The N canticient, or seveity of the querch, far several guenehing sedla H Coefticient Coaling Rate at he Center of a l-in. Bar (CA) Medium Ol no taton) 04 anitation) 025 18 45 HyD inc agtation H0 fegiutont Brine Ino agtaton) Brine lapttiori 10 4.0 190 20 60 90 230 Ad DISTANCE FROM OUENCHED END IN) DIAMETER IN)
What does the process of temper drying do for hardened carbon steel?
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A through hardened gear is to be made with steel (4340) is to be used in an application requiring a minimum tensilestrength of 1514.5 MPa and a minimum ductility of 39.5%RA. Oil quenching followed by tempering is to be used. Brieflydescribe the tempering heat treatment.Explain the use of TTT/Phase diagram and combination of phases
Attached question 5, along with equation 6.
What is quenching? Why should quenched steel be tempered?
The purpose of heat treatment procedure for quenching is a. to decrease hardness b. to increase impact energy O c. to get finer grain size structure O d. to increase hardness O e. to improve ductility
What type of hardening operation that leaves the inner core in a softer condition is sometimes performed on medium-carbon steels?
What can be done to speed up the quenching rate in any liquid?
Why does the hardness decrease at 600 ° C after rising when the tempering process
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.
Identify the mold die material in order to produce the steel casting parts. Steel Cast iron Graphite Wood Full annealing can be done at lower temperature than the subcritical annealing. Select one: True False