• Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

Card Range To Study



Play button


Play button




Click to flip

Use LEFT and RIGHT arrow keys to navigate between flashcards;

Use UP and DOWN arrow keys to flip the card;

H to show hint;

A reads text to speech;

18 Cards in this Set

  • Front
  • Back
  • 3rd side (hint)

Which of the following describe the effects of annealing steel and aluminum alloys?

1. Decrease in internal stress

2. Soften of the metal

3. Improved corrosion resistance

1 and 2

The process of annealing softens a metal and decreases its internal stresses. Improve corrosion resistance is incorrect because annealing does not improve and metals corrosion resistance

Which heat training process of metal produces a hard, wear resistance surface over a strong, tough core?

Case hardening

Low-carbon and low alloy steels may be case-hardened to give a wear resistance surface, &, at the same time, a tough internal core. This process is used on an aircraft crankshaft and camshaft as well.

Which heat-treating operation would be performed when the surface of the metal is changed chemically by introducing a high carbide or nitride content?

Case hardening

Case hardening is usually accomplished in one of the two ways. The first is a process known as carburizing, in which controlled amounts of carbon are added to the surface of the steel to form a carbide. the second method, night riding, introducing nitrogen to the surface of the steel

Normalizing is a process of heat treating

Iron base metals only

Normalizing is used to relieve stresses in ferrous or not iron base metal parts. It is similar to a annealing, but the particles of carbon that precipitate out or not as large as those formed during annealing. Normalizing also produces a harder and stronger material than that obtained by annealing.

Which of the following occurs when a mechanical force is repeatedly applied to most metals at room temperature, such as rolling, hammering, or bending?

1. The metals become artificially agent

2. The metals become stress corrosion crack

3. The metals become a cold work, strain or work hardened.

1 and 3

Mechanically working metals at temperatures below their critical range results in strain, or work hardening of the material. strain hardening can increase metal part's strength and hardness. however, work hardening does reduce and materials flexibility.

The reheating of a heat treated metal, such as with a welding torch

Can significantly alter a metals properties and their reheated areas

When a part is welded, internal stresses and strains set up in the surrounding structures that can significantly alter a metal's properties. In addition, the weld itself is a cast structure whereas the surrounding metals is wrought. These two types of structures can have different grain sizes and, therefore, are not very compatible. To refine the grain structure as well as relieve the internal stresses, all welded parts should be normalized after fabrication.

Why is steel tempered after being hardened?

To relieve its internal stresses and reduce its brittleness

When steel is hardened by quenching, it is usually too hard and brittle for use. Furthermore, rapid quenching causes stress within the steel. Tempering involves reheating the material to a temperature below its critical temperature to draw out some of the hardness and relieve its internal stress.

What aluminum alloy designations indicate that the metal has received no hardening or tempering treatment?


The letter F following an alloy designation indicates that the middle is in an "as fabricated" condition, and has received no hard to think or tempering treatment. An "H" on the other hand, indicates the alloy was hard and while a "O" indicated the metal was annealed

Which material can be heat treated repeatedly without harmful effects?

Clad aluminum alloys

Because clad aluminum has a corrosion resistant coating of pure aluminum over an alloy core, repeated heat treatments can cause diffusion of the alloying agent into the pure aluminum, resulting in reduced corrosion resistance.

What is descriptive of the annealing process of steel during and after it has been annealed?

Slow cooling; low strength

Annealing of steel produces a fine-grained, soft metal. Annealing is accomplished by heating the metal to just above the critical temperature and cooling it very slowly in a furnace.

What is generally used in the construction of aircraft engine firewalls?

Stainless steel

Because of its corrosion resistance properties and high-temperature performance, stainless steel is frequently used in firewalls, exhaust collectors, stacks, and manifolds.

Alclad is a metal consisting of

Pure aluminum surface layers on an aluminum alloy core

"Alclad" is a proprietary name, and refers to the practice of rolling a thin coating of pure aluminum on to both sides of the aluminum alloy improve corrosion resistance.

The Society of Automotive Engineering (SAE) and the American Iron and Steel Institute use a numerical index system to identify the composition of various steels. In the number 4130, designation chromium molybdenum steel, the first digit indicates the

Basic alloying elements

The first digit of an SAE number indicates basic alloying element. Percentage of the basic element in an alloy is wrong because it is indicated by the second digit in the SAE number. Percentage of carbon in the alloy is incorrect because it is indicated by the 3rd and 4th digit.

The core material of Alclad 2024-T4 is

Heat-treated aluminum alloy, and the surface material is commercially pure aluminum.

The term Alcad is used to identify a sheet where a pure aluminum coating is bonded to an aluminum alloy core. The designation 2024 indicates that the core is an aluminum alloy which uses copper as its primary alloying agent. The -T4 means that the sheet has been solution heat treated, followed by natural aging at room temperature.

The aluminum code number 1100 identifies what type of aluminum?

99% commercially pure aluminum

Pure aluminum is assigned a code of 1100. it has a high degree of resistance to corrosion and is easily formed into intricate shapes. Pure Aluminum is not used in structural application because of its low tensile strength

In the 4 digit aluminum index system number 2024, the first digit indicates

The major alloying elements

In the 4 digit aluminum index system, the first digit indicates the alloy type, or the major alloying element. The 2000 series alloys have copper as their major alloying element.

Why is it considered good practice to normalize a part after welding?

To relieve internal stresses developed within the base metal.

Steel. Is forged, welded, or machined develops stresses within the structure that could cause failure. These stresses are typically relieved by a process known as normalizing. During the normalizing process, that part is he did above its critical temperature, then allowed to cool in still air

Parts are rinsed thoroughly in hot water after they have been heat treated in a sodium and potassium nitrate bath to

Prevent corrosion

Some forms of heat treatment required immersion of parts in a heated sodium or potassium nitrate bath. Sodium and potassium nitrate are salts, and salt is a highly corrosive agent. Therefore, all parts bathed in sodium or potassium nitrate must be rinsed to prevent corrosion.