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- Title
Analysis of Degradation and Failure Mechanisms that Develop in Hot Forging Die.
- Authors
Njeh, Fayçal; Kchaou, Mohamed; Elleuch, Riadh; Halouani, Foued
- Abstract
A failed die, used to forge gas valves, was analyzed using macroscopic and microscopic equipment on some specimens. Fatigue cracks on the die were evidently observed on all the surfaces of the die. Many processes were found to be major contributors to have caused the die failure. Oxidation was observed in some areas, especially on plane surfaces and thin sections. Surface layers of tools at the tool-workpiece interface were not only exposed to high mechanical stresses but also to severe temperature cycles, which could have led to loss of strength and hardness. Metallographic analysis revealed that the oxide layers consisted of different diffusion layers which accelerated thermal fatigue mechanisms.
- Subjects
FAILURE analysis; DIES (Metalworking); MATERIAL fatigue; FRACTURE mechanics; OXIDATION; METALLOGRAPHY; THERMAL fatigue of metals
- Publication
Journal of Failure Analysis & Prevention, 2012, Vol 12, Issue 3, p273
- ISSN
1547-7029
- Publication type
Article
- DOI
10.1007/s11668-012-9556-2