Published June 1979 | Version v1
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Effect of heat treatment on the elevated temperature tensile and fracture toughness response of alloy 718

Creators

Description

The effect of heat treatment on the tensile and J/sub Ic/ fracture toughness behavior of Alloy 718 has been characterized at room temperature,, 4270C (8000F) and 5380C (10000F). Two different heat treatments were used: the conventional (ASTM A637) treatment, and a modified heat treatment designed to improve the toughness of Alloy 718 base metal and weldments. The strength of the conventionally heat treated Alloy 718 was found to be slightly greater than that of the modified Alloy 718. This increased strength observed in the conventional material was attributed to a finer grain size and a finer γ precipitate morphology. The elastic--plastic J/sub Ic/ fracture toughness response of the modified Alloy 718 was found to be superior to the J/sub Ic/ behavior exhibited by the conventional material over the entire test temperature range. Metallographic and fractographic examinations of Alloy 718 fracture surfaces revealed that this increase in fracture resistance was related to the dissolution of Widmanstaetten precipitates during the high temperature solution anneal employed in the modified treatment

Availability note (English)

MF available from INIS under the Report Number; Available from NTIS, PC A04/MF A01.

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Additional details

Additional titles

Augmented title (English)
427"0C and 538"0C

Publishing Information

Imprint Pagination
60 p.
Report number
HEDL-TME--78-98

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
10493997
Subject category
S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE;
Descriptors DEI
FRACTURE PROPERTIES; HEAT TREATMENTS; HIGH TEMPERATURE; INCONEL 718; MICROSTRUCTURE; MORPHOLOGICAL CHANGES; PRECIPITATION; SURFACES; TENSILE PROPERTIES; TESTING
Descriptors DEC
ALLOYS; CHROMIUM ALLOYS; CRYSTAL STRUCTURE; INCONEL ALLOYS; MECHANICAL PROPERTIES; MOLYBDENUM ALLOYS; NICKEL ALLOYS; NICKEL BASE ALLOYS; NIOBIUM ALLOYS; SEPARATION PROCESSES; TRANSITION ELEMENT ALLOYS