Heat Treat Industry News

April 18, 2010

Case Studies: Creating Salvage Cycles for Carburized Gears

by Daniel H. Herring

Case studies provide valuable insights into the heat-treat process. They expand our knowledge about the investigative methods needed to overcome specific problems. Such is the case when trying to determine if a material or quenching problem existed on a group of SAE 8822 carburized gears. Let’s learn more.

The Problem

A manufacturer of AGMA Class-3 gears wanted to switch raw material from bar stock to forgings. During qualification trials, normal inspection practices using a test piece (an actual gear segment) produced from bar stock passed case depth and hardness (surface and core) requirements. However, validation testing on an actual part (produced from a forging) was found to have a variation in hardness in the root of the gear teeth. It was necessary to determine the root cause of the problem and to try to design a salvage cycle for the parts already produced.

ReadMore:

http://www.industrialheating.com/Articles/Column/BNP_GUID_9-5-2006_A_10000000000000793411

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