Using the appropriate plot determine the temperature range over which the tempering heat treatment may be conducted. EXPERT ANSWER We are to consider the tempering of an oil-quenched 4340 steel. For a minimum tensile strength of 1380 MPa (200,000 psi) a tempering temperature of less than 450°C (840°F) is required.
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What chapter is heat treatment?
Start studying Chapter 3 heat treatment. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
How hot does steel get?
1) The steel gets heated up to about 550 to 700 degree Celsius for an hour.
What happens if you cold work a microstructure?
This microstructure if further cold worked can lead to cracking and is prone to corrosion
Can extrusion be carried out easily?
5) Extrusion can be carried out easily
Can cold work be done on mild steel?
It should be carried out only on cold worked mild steel if further cold working is required on the steel
Why are ceramics not good candidates for tensile testing?
Brittle ceramics are not good candidates for tensile testing for three reasons: (1) it is difficult to prepare and test specimens having the required geometry; (2) it is difficult to grip brittle materials without fracturing them; and (3) tensile specimens must be perfectly aligned to avoid the presence of bending stresses because ceramics fail after only 0.1% strain.
What are the limitations of steel?
Some distinct limitations of steel and other ferrous alloys are (1) a relatively high density, 2) a comparatively low electrical conductivity, and (3) an inherent susceptibility to corrosion in some common environments.
What are the three factors that contribute to the widespread use of ferrous alloys?
Widespread use of ferrous alloys is accounted for by three factors: (1) iron-containing compounds exist in abundant quantities within the earth's crust; (2) metallic iron and steel alloys may be produced using economical extraction, refining, alloying, and fabrication techniques ; and (3) ferrous alloys are extremely versatile, in that they may be tailored to have a wide range of mechanical and physical properties.
Is a time temperature transformation diagram accurate?
Isothermal transformation diagrams, also called time-temperature-transformation diagrams, are accurate only for transformations in which the temperature of the alloys is held constant throughout the duration of the reaction.