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Book Chapter

A Broken Cross-Recessed Die Made from High Speed Tool Steel

Available to Purchase

By Egon Kauczor
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001250
EISBN: 978-1-62708-223-5
... to such stresses together with the low purity favored the fracture of the tool. Cracking (fracturing) Forming dies High speed tool steels Segregations DMo5 (Other, general, or unspecified) fracture Figure 1 shows a general view of the piece of the broken cross-recessed die under examination...
Abstract
A broken cross-recessed die was examined. Examination of the unetched, polished section for impurities revealed several coarse streaks of slag. The purity did not therefore correspond to the requirements set for a high speed tool steel of the given theoretical quality DMo 5. After etching with 5% nital the polished surface exhibited a pronounced, easily-visible, fibrous structure. Microscopic examination revealed that this etch pattern was produced by marked segregation bands. The very unfavorable structure for a high speed steel tool of these dimensions and subject to such stresses together with the low purity favored the fracture of the tool.