Acoustic emission from hydrogen saturated Type 304L stainless steel

Journal Article · Sun Jul 01 00:00:00 EDT 1979 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(79)90113-3· OSTI ID:5940905

Caskey, Jr, G R

Effects of hydrogen on tensile deformation and fracture of austenitic stainless steels vary widely, depending upon the steel composition and treatment, hydrogen exposure, and loading conditions. In alloys such as Type 310 and Type 316 stainless steel, the ductility loss is small; and the fracture mode is unchanged. In contrast, Type 304L, 21-6-9, and Tenelon display large ductility losses with a change from ductile rupture to transgranular cleavage at 200 to 270 K. Intergranular fractures are observed in notched tensile tests of sensitized stainless steel at room temperature. Transgranular cleavage is observed after hydrogen exposure. The cleavage varies with test temperature, hydrogen concentration, and grain size. Microcracks form preferentially aong coherent twin boundaries throughout the deformed metal but are observable only after a 12 to 14% plastic strain. Microcracks along grain boundaries occur less frequently. The microcracks and consequent cleavage failure appear closely related to the stability of the austenite with respect to the epsilon-phase as measured by stacking-fault energy and may also be related to the strain induced martensite. The mechanism of microcrack nucleation and growth is not certain.

• Research Organization: E.I. du Pont de Nemours and Co., Aiken, SC
• DOE Contract Number: AT(07-2)-1
• OSTI ID: 5940905
• Journal Information: Scr. Metall.; (United States), Vol. 13:7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HYDROGEN
METALLURGICAL EFFECTS
STAINLESS STEEL-304L
FRACTURE PROPERTIES
CLEAVAGE
CRACKS
DEFORMATION
GRAIN SIZE
NUCLEATION
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
ELEMENTS
FLUIDS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
NONMETALS
SIZE
STAINLESS STEELS
STEELS
360103* - Metals & Alloys- Mechanical Properties