Applying a new push-to-pull micro-tensile testing technique to evaluate the mechanical properties of high dose Inconel X-750

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:748

Article

Howard, C.¹  Judge, C. D.¹  Hosemann, P.² 

[1] CNL, 286 Plant Rd, Chalk River, ON K0J 1J0, Canada

[2] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA

关键词: Mechanical properties;    Small scale mechanical testing (SSMT);    Nickel superalloys;    Neutron irradiation;    High dose;   

DOI  :  10.1016/j.msea.2019.01.113

来源: Elsevier

【 摘 要 】

The results from a novel, micro-tensile testing technique, employing a micro-electro-mechanical system, operated in a push-to-pull configuration, to study the effects of radiation damage on Inconel X-750, are presented. Non-irradiated material, along with material irradiated to 67 dpa and 81 dpa at two irradiation temperatures, 120-280 degrees C and 300-330 degrees C, is investigated. This testing approach implements a safe, lift-out, extraction method that enables the evaluation of material tensile behavior in specific locations of radioactive components with complex geometries outside of costly hot cell protective environments. Regional cold working and grinding manufacturing processes that go undetected in bulk component testing can be evaluated in parallel with radiation damage effects. Non-irradiated specimens on the order of 1 mu m x 1 mu m x 2.5 mu m taken from center regions of the material unaffected by processing produced yield strengths of 938 MPa and 1043 MPa, in good agreement with the bulk yield strength of Inconel X-750: 972-1070 MPa. Mechanical strengths of material irradiated to 67 dpa decreased by similar to 75 MPa for material irradiated at 300-330 degrees C and similar to 176 MPa for material irradiated at 120-280 degrees C, compared to the non-irradiated material. However, material irradiated to 81 dpa has practically identical mechanical strengths at the two irradiation temperatures, and these strengths are similar to 100 MPa greater than those of non-irradiated material. Average ductility of the material decreases more quickly when irradiated at 300-330 degrees C, from an initial value of similar to 15% to similar to 5% after 67 dpa, whereas the ductility of the material irradiated at 120-280 degrees C remains close to the initial value at 67 dpa and decreases to similar to 2% after 81 dpa.

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