Hydrogen embrittlement of a 12 Cr-1 Mo steel

Conference · Fri Jul 01 04:00:00 EDT 1983

OSTI ID:5866680

Jones, R H; Thomas, M T

The grain boundary phosphorus and sulfur concentrations of HT-9 were found to depend on heat treatment in a manner consistent with other ferritic steels. After a tempering treatment of 2.5 hrs at 760/sup 0/C, the grain boundary phosphorus and sulfur concentrations were 0.015 and 0.03 monolayers, respectively while after a heat treatment of 240 hrs at 540/sup 0/C their grain boundary concentrations were 0.04 and 0.01 monolayers, respectively. Straining electrode tests at cathodic test potentials revealed that HT-9 is sensitive to hydrogen embrittlement with the fracture mode changing from ductile micro-void type fracture in air to a mixed intergranular and quasi-cleavage fracture at cathodic potentials. The reduction of area was 13% at cathodic test potentials and 60% in air. Charpy impact tests revealed a 10/sup 0/C increase in the ductile to brittle transition temperature with heat treatment at 540/sup 0/C.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5866680
• Report Number(s): PNL-SA-10811; CONF-830659-11; ON: DE83016781
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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ALLOY-HT-9
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CRYSTAL STRUCTURE
DUCTILITY
ELEMENTS
EMBRITTLEMENT
GRAIN BOUNDARIES
HEAT TREATMENTS
HIGH TEMPERATURE
HYDROGEN EMBRITTLEMENT
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NONMETALS
PHOSPHORUS
STEELS
SULFUR
TENSILE PROPERTIES