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Failure mechanisms of H13 die on relation to the forging process - A case study of brass gas valves

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2010
auteur(s) KChaou Mohamed; Elleuch Riadh; Desplanques Yannick; Boidin Xavier; Degallaix Gérard
journal (abréviation) Engineering Failure Analysis (Eng Fail Anal)
volume (numéro) 17 (2)
pages 403 – 415
résumé In the hot forging industry, die life is an important process factor because of the cost involved in lost production, replacement of die blocks and operative handling of the dies. There is still no consensus, however, on the type of wear affecting dies or the dominant mechanisms for die failure, which varies from one situation to another. This metallographic study of a failed industrial hot forging die used to forge gas cylinder valves has indicated various failure modes. Although plastic deformation and thermal fatigue are usually quoted as the main causes of damage, oxidative and abrasive wear, fatigue cracking and chipping appeared to bet he most important in this study. Feedback coupling of fatigue and wear effects are detected. Detailed Scanning Electron Microscopy observations and Energy-Dispersive X-ray and optical profilometry analysis suggest that these failures might very depending on their localization on the die surfaces and show a complex mechanisms related to the variation of process parameters.
mots clés hot forging die; damage analysis; failure mechanisms; coupling fatigue-wear
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