Observations of Star Fracture and Longitudinal Splitting in BIS 812 EMA and Q1N Submarine Construction Steels,
Abstract
The tensile properties and fracture behaviour of two submarine construction steels, BIS 812 EMA and Q1N, have been studied. Their properties and fracture behaviour were measured over a wide range of test temperatures utilizing plain and notched tensile specimens. The yield strength of both materials was found to increase with decreasing temperature and the fracture surface appearance of these steels was also temperature dependent. Under certain conditions star fracture was exhibited, rather than the usual cup-and-cone type fracture. The predominance of the star type fracture increased with decreasing temperature in both plain and notched tensile specimens, however, it was suppressed by notching. This paper describes in detail the fractographic features of the surfaces and proposes that a range of conditions exist under which star fracture occurs in these materials. (AN)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1995
- Accession Number
- ADA299359
Entities
People
- D. S. Saunders
- I. A. Burch
Organizations
- Defence Science and Technology Group