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Title: Progress Report on Long Hold Time Creep Fatigue of Alloy 617 at 850°C

Alloy 617 is the leading candidate material for an intermediate heat exchanger for the very high temperature reactor. To evaluate the behavior of this material in the expected service conditions, strain-controlled cyclic tests that include long hold times up to 240 minutes at maximum tensile strain were conducted at 850°C. In terms of the total number of cycles to failure, the fatigue resistance decreased when a hold time was added at peak tensile strain. Increases in the tensile hold duration degraded the creep-fatigue resistance, at least to the investigated strain controlled hold time of up to 60 minutes at the 0.3% strain range and 240 minutes at the 1.0% strain range. The creep-fatigue deformation mode is considered relative to the lack of saturation, or continually decreasing number of cycles to failure with increasing hold times. Additionally, preliminary values from the 850°C creep-fatigue data are calculated for the creep-fatigue damage diagram and have higher values of creep damage than those from tests at 950°C.
Authors:
 [1]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
OSTI Identifier:
1235207
Report Number(s):
INL/EXT--15-35132
TRN: US1600236
DOE Contract Number:
AC07-05ID14517
Resource Type:
Technical Report
Research Org:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CREEP; FATIGUE; STRAINS; PROGRESS REPORT; HEAT EXCHANGERS; TEMPERATURE RANGE 1000-4000 K; DAMAGE; DIAGRAMS; FAILURES; DEFORMATION; INCONEL 617; VHTR REACTOR; TEMPERATURE RANGE 1000-4000 K; TENSILE PROPERTIES Alloy 617; Creep-Fatigue; Intermediate Heat Exchanger (IHX); Very High Temperature Reactor (VHTR)