Effects of focused ion beam milling on austenite stability in ferrous alloys

Journal Article · Fri Jan 15 04:00:00 EST 2010 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2009.09.013· OSTI ID:22066165

Rowenhorst, D J; Fonda, R W; Spanos, G ^[1]

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1. Naval Research Laboratory, 4555 Overlook Ave, SW Washington, DC 20375 (United States)

The susceptibility of fcc austenite to transform to bcc during focused ion beam milling was studied in three commercial stainless steels. The alloys investigated, in order of increasing austenite stability, were: (i) a model maraging steel, Sandvik 1RK91; (ii) an AISI 304 austenitic stainless steel; and (iii) AL-6XN, a super-austenitic stainless steel. Small trenches were milled across multiple austenite grains in each alloy using a 30 kV Ga{sup +} ion beam at normal incidence to the specimen surface. The ion beam dose was controlled by varying the trench depth and the beam current. The factors influencing the transformation of fcc austenite to bcc (listed in order of decreasing influence) were found to be: (i) alloy composition (i.e., austenite stability), (ii) ion beam dose (or trench depth), and (iii) crystallographic orientation of the austenite grains. The ion beam current had a negligible influence on the FIB-induced transformation of austenite in these alloys.

• OSTI ID: 22066165
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 1 Vol. 61; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
AUSTENITIC STEELS
BACKSCATTERING
BCC LATTICES
BEAM CURRENTS
ELECTRON DIFFRACTION
FCC LATTICES
GALLIUM IONS
GRAIN ORIENTATION
ION BEAMS
MARAGING STEELS
METALLURGICAL EFFECTS
MILLING
PHASE STABILITY
STAINLESS STEELS