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 annealing8-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.

Note: Since you have posted a question with multiple sub-parts, we will solve first three sub- parts…

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.

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.

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 2RQ: Direct hardening can be performed on steel containing at least________ carbon.

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Concept explainers

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

Question

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.

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