Material Analysis of Failed Cold-Drawn Billet.

摘要

In May 2008, a substrate failure occurred while attempting to explosively clad a Ta10W liner to the inner diameter of a cold-drawn steel tube. Previous cladding operations, using condemned 25mm M242 gun barrels of forged steel, were repeatedly successful. A failure investigation was performed to determine causes for the unexpected fracture of the cold-drawn tube. The failure of the substrate was investigated with a number of materials forensic techniques including fractography, metallography, chemical analysis, mechanical properties testing, etc. The investigation revealed the extremely low toughness of the cold-drawn material when compared to the forged material. The poor performance of the material was exacerbated by welds applied to the substrate during preparations for the bonding process.