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Abstract

FATIGUE CRACK GROWTH IS CONSIDERED TO BE A LIMITING FACTOR FOR THE LIFE TIME OF THE FIRST WALL OF A TOKAMAK TYPE CONTROLLED THERMONUCLEAR REACTOR. AS A RESULT OF THE HIGH ENERGY NEUTRON SPECTRUM IN THE D-T FUSION REACTION NOT ONLY DEFECTS BUT ALSO LARGE QUANTITIES OF HELIUM DUE TO NUCLEAR TRANSMUTATION ARE PRODUCED IN THE STRUCTURAL MATERIALS. ONE WAY OF SIMULATING THE DAMAGE OF HIGH ENERGY NEUTRONS IS TO USE LIGHT IONS BY MEANS OF A CHARGED PARTICLE ACCELERATOR. TYPE 316 STAINLESS STEEL SPECIMENS WERE IRRADIATED IN A SUITABLE IRRADIATION CHAMBER USING A VARIABLE ENERGY CYCLOTRON. FATIGUE CRACK GROWTH UNDER CYCLIC TENSILE STRESS WAS MEASURED UNDER SIMULTANEOUS 18 MEV PROTON IRRADIATION PRODUCING A DISPLACEMENT DAMAGE RATE OF THE ORDER OF 1.0 E-7 DPA/S. THE SAME TYPE OF SPECIMENS WERE IMPLANTED WITH 38 MEV ALPHA-PARTICLES AND TESTED AFTER BOMBARDMENT. IT WAS FOUND THAT LIGHT IONS IRRADIATION HAS ONLY A SLIGHT INFLUENCE ON FATIGUE CRACK GROWTH AT 500 C IN TYPE 316 STAINLESS STEEL.

Additional information

Authors: FENICI P JRC-ISPRA, JRC-ISPRA
Bibliographic Reference: PAPER PRESENTED: 3RD INTERNATIONAL CONFERENCE ON FUSION REACTOR MATERIALS, KARLSRUHE/D OCT. 4-8, 1987. JOURNAL OF NUCLEAR MATERIALS, VOLS. 155-157, PP 980-984, 1988
Record Number: 1989126230100 / Last updated on: 1989-04-01
Category: PUBLICATION
Available languages: en
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