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Consider the following statements about forging: 1. Forgings have high strength and ductility. 2. Forgings offer great resistance to impact and fatigue loads. 3. Forging assures uniformity in density as well as dimensions of the forged parts. Which of the above statements are correct?

Consider the following statements about forging: 1. Forgings have high strength and ductility. 2. Forgings offer great resistance to impact and fatigue loads. 3. Forging assures uniformity in density as well as dimensions of the forged parts. Which of the above statements are correct? Correct Answer 2 and 3 only

Explanation:

Forging is the process by which a metallic part is deformed to its final shape with the application of pressure and with or without the application of heat. Forging involves the application of compressive stress which exceeds the flow stress of the metal. This stress is applied either quickly or slowly.

Following are the major advantage of forging:

  • During forging the pores and inclusions, if they are there; are closed and homogenized. So, it improves the density and the soundness of the products which are made by the forging process.
  • Forged parts have high mechanical and dynamic strength due to process-related grain refinement and unbroken grain flow, therefore it offers great resistance to impact and fatigue loads.
  • The parts are almost free of pores and shrink holes. This results in a higher mechanical load capacity of the parts.
  • Forgings are invariably produced by the hot-working process and this controls the resultant structure and properties.
  • Forging can produce parts with a high strength-to-weight ratio.
  • Forgings have high strength and reduced ductility due to work hardening.
  • Forging processes are very economical for moderate to high volume productions.
  • Dimensional characteristics are remarkably stable. Successive forgings are produced from the same die impression, and because die impressions exert control over all contours of the forged part, the possibility of transfer distortion is eliminated

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