Mechanical Properties and Fracture Surfaces of Thixoformed HP9/4/30 Steel

Journal Article · Sat Apr 07 04:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2729675· OSTI ID:21056976

Omar, M Z; Jaharah, A G ^[1]; Atkinson, H V ^[2]; Kapranos, P ^[3]

---

1. Department of Mechanical and Materials Engineering, National University of Malaysia, 43600 UKM Bangi, Selangor (Malaysia)
2. Department of Engineering, University of Leicester, University Rd., Leicester, LE1 7RH (United Kingdom)
3. Department of Engineering Materials, University of Sheffield, Hadfield Building, Mappin St., Sheffield, S1 3JD (United Kingdom)

Most work in semi-solid metal processing has been focused on relatively low-melting temperature materials such as aluminium, magnesium, tin, lead and their composites. Because of the high melting temperatures and related measurement difficulties, there is relatively small amount of experimental data available on the thixoforming of high temperature materials such as steels. This paper discusses the relationships between tensile tests data and the fracture surfaces of HP9/4/30 steel samples, in as-received and as-thixoformed conditions. Some of the as-thixoformed samples were subjected to commercial heat treatments before the tests were carried out. The as-received samples showed a typical ductile fracture of 'cup' and 'cone' surface appearance. The thixoformed samples, although showing some significant increase in tensile strength values, failed in a brittle manner, with the fracture surfaces showing a 'cobbled' surface appearance. The application of the commercial heat treatment to the thixoformed samples has significantly improved their ductility.

• OSTI ID: 21056976
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 907; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
DUCTILITY
FRACTURES
HEAT TREATMENTS
LEAD
MAGNESIUM
MELTING POINTS
PROCESSING
SOLIDS
STEELS
SURFACES
THIXOTROPY
TIN