SYMPOSIA PAPER Published: 01 January 1975
STP33689S

Improvement of Creep Properties in a Helium Injected Austenitic Stainless Steel

Source

The effect of helium on creep properties was studied in AISI Type 316 austenitic steels after two kinds of treatment, namely, cold rolling and grain-boundary strengthening. Helium was injected into the specimens using a cyclotron, and the creep-rupture tests were performed at 650°C in air. In the cold-rolled specimens, the creep-rupture strengths increased with cold working. The loss of ductility due to the helium injection was minimum at about 10 percent of cold rolling.

In the grain-boundary strengthened treatment, serrated grain boundaries were produced by the two step solution treatment. The specimens with serrated grain boundaries had good creep-rupture strength in both the presence or absence of helium. However, a specimen with extreme grain growth during the two step solution treatment had low creep ductility and severe helium embrittlement. A specimen which had serrated grain boundaries without extreme grain growth had excellent creep properties in both helium uninjected and injected cases.

Author Information

Kawasaki, S
Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken, Japan
Furuta, T
Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken, Japan
Nagasaki, R
Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken, Japan
Uematsu, K
Fuel and Materials, Power Reactor and Nuclear Fuel Development Corporation, Minato-Ku, Tokyo, Japan
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Details
Developed by Committee: E10
Pages: 218–232
DOI: 10.1520/STP33689S
ISBN-EB: 978-0-8031-4653-2
ISBN-13: 978-0-8031-0539-3