Metallographic Analysis of a Failed Cast Upper Ram of a Die-Forging Hammer

Renáta Palupčíková; Petra Váňová; Vlastimil Vodárek

doi:10.4028/p-XMm52L

Paper Titles

Preface

Microstructural Processes in Thermal Creep of Zirconium Nuclear Fuel Cladding Tubes
p.3

Analysis of Cavitation Damage of HR3C Steel Tube Joints after Internal Pressure Creep Tests
p.9

Hydrogen Embrittlement of X52 Electrolytically Charged Pipeline Steel
p.15

Metallographic Analysis of a Failed Cast Upper Ram of a Die-Forging Hammer
p.23

Crack Analysis in Welds of Boiler Tubes Made of T24 Steel
p.31

Comparing the Mechanical Properties of Secure Ballistic Steels after Heat Treatment by the Q-P Process
p.39

Comparative Study of Direct Energy Deposition (DED) and Traditional Casting Techniques for 316l Stainless Steel
p.47

3D Printing Materials Testing for Gears
p.59

HomeMaterials Science ForumMaterials Science Forum Vol. 1166Metallographic Analysis of a Failed Cast Upper Ram...

Metallographic Analysis of a Failed Cast Upper Ram of a Die-Forging Hammer

Abstract:

This paper deals with results of detailed investigations on a failed cast upper ram (63 tons) of a die-forging hammer. Subsurface cast defects primarily represented the “weak areas” responsible for the initiation of fatigue cracks during industrial exploitation. These defects mostly corresponded to gas bubbles. The occurrence of Ti (C,N) particles on the surface of these bubbles indicated that these defects were probably a consequence of release of gas products from the casting mould and/or mould's painting during the pouring of liquid metal. The evidence of fatigue initiation on repair welds was obtained only in one case. It was revealed that in this case the cast defects on the surface of the guiding radius were not completely cut off before repair welding. The remnants of the cast defects in the interface weld/base material initiated the fatigue crack. Basic mechanical properties of the subsurface layer of the upper ram complied with the design requirements.

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Periodical:

Materials Science Forum (Volume 1166)

Pages:

23-29

DOI:

https://doi.org/10.4028/p-XMm52L

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Online since:

November 2025

Authors:

Renáta Palupčíková, Petra Váňová, Vlastimil Vodárek*

Keywords:

Die-Forging Hammer, Fatigue, Gas Bubbles, Mechanical Properties, Microstructure, Repair Welds, Shrinkage Cavities, Upper Ram

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