ENVIRONMENTAL CRACKING IN AISI 4340 STEEL.
ILLINOIS UNIV URBANA DEPT OF THEORETICAL AND APPLIED MECHANICS
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Knowledge of the subcritical flaw growth characteristics of the material under the expected service conditions is an important part of any fracture control plan. The prime causes of subcritical flaw growth are fatigue, adverse environment, or both. Fatigue loading will cause crack growth in all metals while adverse environments may or may not. In some steels a moist air environment is of severe enough nature to cause substantial subcritical flaw growth. For the materials engineer working in the area of fracture control, all flaw growth due to environment has become known as stress corrosion cracking although the mechanism in many cases is probably not one of corrosion. Therefore, in this paper the term environmental cracking will be used when referring to cracking caused by adverse environments. Author
- Properties of Metals and Alloys