Question 215General Subjects - Assistant Engineer70% to pass
Reheating a hardened component to a temperature lower than the hardening temperature and then cooling it is known as _______________.
AI Explanation
The correct answer is D) tempering.
Tempering is the process of reheating a hardened component to a temperature lower than the hardening temperature, and then cooling it. This process is done to reduce the brittleness of the hardened component and increase its toughness and ductility.
The other options are incorrect because:
A) Case hardening is a different process that involves the introduction of carbon or nitrogen into the surface of a metal component to increase its hardness.
B) Low temperature hardening refers to the initial hardening process, not the subsequent tempering.
C) Annealing is the process of heating a metal to a high temperature and then slowly cooling it to relieve internal stresses and increase its softness.
Related Questions
#213 An arrow superimposed on a hydraulic graphic symbol at approximately 45°, as shown in the illustrated figures A, B, and C, indicates the component _______________. Illustration GS-0068#214 The ability of a metal to be hammered, or rolled out is called its _______________.#216 When hardened metal is heat-treated by a process known as tempering, what metallurgical properties are achieved? #217 When metal is tempered, it becomes _______________.#218 What is the purpose of heat treating steel?