Nonequilibrium grain-boundary segregation and ductile-brittle-ductile transition in Fe-Mn-Ni-Ti age-hardening alloy

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/BF02663854· OSTI ID:417862

Heo, N H ^[1]

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1. Seoul National Univ. (Korea, Republic of). Dept. of Metallurgical Engineering

Nonequilibrium segregation kinetics of alloying elements and a ductile-brittle-ductile transition behavior have been investigated in an Fe-8.4Mn-7.4Ni-1.7Ti alloy. The alloy experienced a ductile-brittle-ductile (DBD) transition during isothermal aging. In the brittle region, the alloy showed a decrease in intergranular fracture strength and a subsequent increase with aging time. This is due to the segregation of titanium to the grain boundaries and its desegregation into the matrix. The intergranular fracture strength was higher on the zero tensile elongation finish curve than on the start curve. This is because the grain-boundary segregation level of titanium is relatively lower on the finish curve. The lowest intergranular fracture strength increased with increasing aging temperature, which was attributed to a lower grain-boundary segregation level of titanium at higher temperature. Manganese caused an overall reduction in intergranular fracture strength and, as a result, the delayed occurrence of the zero tensile elongation (ZTE) finish curve in a temperature and long-time plot.

• Sponsoring Organization: USDOE
• OSTI ID: 417862
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 10 Vol. 27; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
AUGER ELECTRON SPECTROSCOPY
AUSTENITE
CASTING
CHEMICAL COMPOSITION
FORGING
HARDNESS
HEAT TREATMENTS
IRON ALLOYS
MANGANESE ALLOYS
MICROSTRUCTURE
NICKEL ALLOYS
ROLLING
SAMPLE PREPARATION
SCANNING ELECTRON MICROSCOPY
TENSILE PROPERTIES
TITANIUM ALLOYS