Adiabatic shear band formation during dynamic torsional deformation of an HY-100 steel

Journal Article · Mon Mar 01 04:00:00 UTC 1993 · Acta Metallurgica et Materialia; (United States)

OSTI ID:6303414

Cho, Kyung-Mox ^[1]; Lee, Sunghak ^[2]; Nutt, S R; Duffy, J ^[3]

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1. Pusan National Univ., (Korea, Republic of). Dept. of Metallurgical Engineering
2. Pohang Institute of Science and Technology, (Korea, Republic of). Dept. of Materials Science and Engineering
3. Brown Univ., Providence, RI (United States). Division of Engineering

Dynamic torsion experiments have been conducted on thin-walled tubular specimens of a tempered martensitic HY-100 steel, causing adiabatic shear bands to form. The strain rates imposed were [approximately]10[sup 3]s[sup [minus]1] and local temperature increases up to 600 C within the shear bands were measured. The shear band microstructure was examined by transmission electron microscopy (TEM), revealing two distinct microstructures. In some regions, highly elongated narrow subgrains extended in the shear direction, while in other regions, fine equiaxed cells were characteristic. The proportions of the two microstructures varied for different specimens, and the observations were interpreted to indicate that a process of dynamic recovery accompanying large deformation and a high temperature rise occurred within the shear band. Although thermal effects were apparent, there was no evidence to support a phase transformation to austenite followed by martensite formation. On the basis of present findings, it appears that the thermodynamic stability of the original microstructure can influence the tendency toward shear localization under dynamic loading conditions.

• OSTI ID: 6303414
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:3; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
DEFORMATION
DYNAMIC LOADS
ELECTRON MICROSCOPY
IRON ALLOYS
IRON BASE ALLOYS
MARTENSITIC STEELS
MICROSCOPY
MICROSTRUCTURE
SHEAR
STABILITY
STEELS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
THERMODYNAMICS
TORSION
TRANSMISSION ELECTRON MICROSCOPY