Hydrogen embrittlement of spheroidized plain carbon steel sheets under multiaxial states of stress

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:7046476

Fan, Y

Hydrogen embrittlement of three grades of spheroidized plain carbon steel sheets (AISI 1020, 1050, and 1070) was investigated at room temperature over a range of stress states from uniaxial to equibiaxial tension. For a given stress state, data based on locally determined fracture strains show a decrease in ductility for cathodically charged specimens compared with the corresponding uncharged condition. The loss of ductility caused by hydrogen increases with an increasing degree of biaxiality of the stress state and volume fracture of spheroidized carbide particles (or carbon content). Thus, hydrogen embrittlement of spheroidized steel sheets, while not severe, is most prominent at high carbon contents and under an equibiaxial state of stress. Metallographic and fractographic examinations show that the fracture of both charged and uncharged materials is a consequence of void nucleation (due to carbide particle ferrite decohesion) void growth, and void link-up. The quantitative determination of void density, void size, and void areal fraction as a function of the equivalent plastic strain indicates that both void nucleation and void growth are accelerated by hydrogen, especially in equibiaxial tension.

• Research Organization: Michigan Technological Univ., Houghton (USA)
• OSTI ID: 7046476
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CARBON STEELS
DUCTILITY
EMBRITTLEMENT
FRACTURE PROPERTIES
HYDROGEN EMBRITTLEMENT
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
METALLOGRAPHY
SHEETS
STEELS
STRAINS
STRESS ANALYSIS
TENSILE PROPERTIES
VOIDS