In the SAE/AISI four-digit steel designation system used for aircraft alloy steels, what does the FIRST digit of the number '4130' indicate?
Ferrous Materials
Question · Medium
What do the four digits of SAE 4130 steel tell you?
6.1 Aircraft Materials - Ferrous
Flashcard
In the steel designation 4130, what do the last two digits ('30') represent?
Question · Easy
Cool heated steel rapidly in brine, water or oil so that it hardens.
Ferrous materials
Guess the Term
Chapter 1: Ferrous Aircraft Materials
1.1 Alloy Steels, Crystal Structure & Specifications
Study guide
Cheat sheet
Which heat-treatment process consists of heating a steel to above its critical temperature and then cooling it SLOWLY (typically in the furnace) to produce a soft, ductile, machinable structure and relieve internal stress?
Question · Hard
Read the clue and guess the term in 6 tries.
Game
Annealing and normalising both soften steel. What separates them?
After a steel component has been quench-hardened it is too brittle for service. Which process is applied to reduce that brittleness and toughen the part while retaining most of its hardness?
Reheat hardened steel in a furnace, then cool it in air, oil or water, to relieve strain and reduce brittleness.
Nitriding and carburising are both used on aircraft steel parts. What is their primary purpose?
Which crack-detection method works on a steel part but not on an aluminium one?
A Brinell or Rockwell test is performed on a steel component during inspection. Which material property are these tests measuring?
Heat metal, hold it at temperature, then cool it very slowly to soften it and relieve internal stress.
Non-ferrous materials
1.2 Heat Treatment of Ferrous Metals
Which destructive test uses a notched specimen struck by a swinging pendulum to measure a metal's resistance to sudden shock loading?
Swap tiles to line up three of the same term.
Term Match
Why is a high-strength steel part baked soon after cadmium plating or acid cleaning?
On a tensile stress-strain graph for a ductile steel, what does the 'yield point' represent?
Only reddish-colored metal, second only to silver in electrical conductivity.
Why is alloy steel 4340 frequently chosen for highly stressed aircraft components such as landing-gear legs?
What is the main alloying element in 2024 aluminium compared with 7075?
6.2 Aircraft Materials - Non-Ferrous
What is the principal alloying element that makes a steel 'stainless' (corrosion resistant)?
Trade name for a light, strong aramid fiber used in areas prone to impact damage.
Composite materials
1.3 Mechanical & Non-Destructive Testing of Metals
Normalising of a steel component differs from full annealing principally in that normalising:
Flip two cards at a time to find matching terms.
Term Pairs
What do the tempers T3, T6 and T73 mean on an aluminium alloy?
A magnet is brought near an unknown aircraft metal and is strongly attracted. This indicates the material is most likely:
Light natural wood used as a structural core, denser than other core materials but less dense than ordinary wood.
Which alloying element is the MAIN constituent (besides aluminium) of the 2xxx series aircraft aluminium alloys such as 2024?
Non Ferrous Materials
What handling precaution does titanium need that aluminium does not?
Which alloying element is the principal addition in the high-strength 7xxx series aluminium alloys such as 7075?
Principal spanwise structural member of a wing, often made of spruce in a wooden wing.
Wooden structures
1.4 Repair & Inspection Procedures for Ferrous Structures
In the temper designation '2024-T3', what does the 'T3' indicate?
Find five hidden terms in a grid of letters.
Term Search
How can you check that an aluminium part is still in the right heat-treated condition without cutting it up?
What does the temper designation 'T6' applied to an aluminium alloy (e.g. 7075-T6) mean?
Cellulose coating applied over aircraft fabric to protect it and tighten it on the frame.
Fabric covering
Precipitation (age) hardening of a heat-treatable aluminium alloy normally consists of which sequence?
What can a dye penetrant inspection never find?
After solution heat treatment and quenching, why is some high-strength aluminium-alloy rivet stock (such as 2024 'icebox' rivets) stored in a freezer before use?
Metal that corrodes in an electrochemical cell while a dissimilar conductor serves as the cathode.
Corrosion
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