Comparison of the response of 316 SS and the P7 ally to heavy-ion irradiation

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

OSTI ID:6810760

Sindelar, R L

A high purity austenitic stainless steel was compared to a commercial purity type 316 stainless steel after exposure to heavy ion irradiations. Specimens of the P7 alloy, a high purity austenitic alloy similar to 316 SS but with a high (1000 appm) oxygen content, and the MFE heat of 316 SS were irradiated with 14 MeV nickel ions at temperatures that ranged from 400 to 650/sup 0/C (0.4-0.55 T/sub m/). These studies were conducted at displacement damage rates from 1 to 4 x 10/sup -3/ dpa/s within a layer approx.3..mu..m from the specimen the surface. A cross-sectioning technique of specimen preparation was applied to allow TEM analysis throughout this damage range. This study is the first report on heavy-ion irradiation effects on P7 and 316 SS viewed in cross section. Voids readily formed in P7 over all temperatures and doses investigated (400-650/sup 0/C), 2-100 dpa). A suppression in the cavity number density and size was noted at depths which correspond to the range of the bombarding nickel ions for irradiations at temperatures of 400 and 500 /sup 0/C. This decrease in cavity nucleation agrees with current radiation damage models for these irradiation conditions. Void formation in 316 SS occurred from the lowest temperature investigated, 450/sup 0/C, up to 550/sup 0/C. The absence of void formation in samples irradiated at 600 and 650/sup 0/C up to 40 dpa is attributed to the inability to nucleate voids at these temperatures in the absence of gaseous nucleating agents.

• Research Organization: Wisconsin Univ., Madison (USA)
• OSTI ID: 6810760
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
STAINLESS STEELS
PHYSICAL RADIATION EFFECTS
COMPARATIVE EVALUATIONS
HIGH TEMPERATURE
MEV RANGE 10-100
NICKEL IONS
NUCLEATION
VOIDS
ALLOYS
CHARGED PARTICLES
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
ENERGY RANGE
IONS
IRON ALLOYS
IRON BASE ALLOYS
MEV RANGE
RADIATION EFFECTS
STEELS
360106* - Metals & Alloys- Radiation Effects