Undissolved Ferrite Can Affect Performance
Free ferrite is the most detrimental of the nonmartensitic microstructures and also affects the performance of the product is discussed. Poor quench severity and incomplete austenitization are leading causes for the presence of non-martensitic microstructures in heat-treated steel. Incomplete austenitization can result from overloading a furnace, improper load distribution, temperature gradients and temperature controller that is out of calibration. Undissolved ferrite is relatively easy to recognize by the characteristic shape created as austenite grows into the ferrite. The scale of the starting ferrite and pearlite microstructure is very important when considering induction hardening. Two approaches reduce the amount of undissolved ferrite in induction-heated components.
D. C. Van Aken, "Undissolved Ferrite Can Affect Performance," Industrial Heating, BNP Media, Inc., Jan 2001.
Materials Science and Engineering
Article - Journal
© 2001 BNP Media, Inc. , All rights reserved.