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Title: Fracture toughness characterization of Type 410 stainless steel: Final report

Abstract

Type 410 stainless steel has been used as an alternative material for bolts and studs because of its mechanical properties and corrosion resistance. However, failures have occurred in 410 stainless steel that have prompted further studies to characterize the properties of the failed material. After the discovery of failed valve studs by Virginia Power, investigation of the failures focused on improper heat treating of the studs, resulting in temper embrittlement. (The studs were purchased to ASTM specification A 193 Grade B6, with a supplemental requirement of 125 ksi tensile strength.) To assess the fracture properties of the stud material, pieces of several failed studs were sent to Materials Engineering Associates, Inc. Characterization of the material was performed using impact tests (Charpy-V notch specimens), strength tests (tensile specimens), and static fracture toughness tests (compact tension specimens). The strength tests revealed 0.2% offset yield and ultimate strengths exceeding ASTM and Virginia Power requirements, although the reduction-of-area requirement was satisfied in only three of six tests. The impact tests revealed low toughness, with 20 ft-lb and 20% shear not eclipsed until 430/sup 0/F. Test results at 550/sup 0/F indicate an upper shelf in excess of 80 ft-lb. The static fracture toughness tests exhibitedmore » cleavage failure from 40/sup 0/F to 200/sup 0/F, with low toughness at 40/sup 0/F and 120/sup 0/F. Higher toughness was observed at 200/sup 0/F, with the onset of the static upper shelf probably occurring between 300/sup 0/F to 400/sup 0/F. 2 refs., 10 figs., 4 tabs.« less

Authors:
Publication Date:
Research Org.:
Materials Engineering Associates, Inc., Lanham, MD (USA)
OSTI Identifier:
5747016
Report Number(s):
EPRI-NP-5511
ON: TI88920111
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 36 MATERIALS SCIENCE; FASTENERS; EMBRITTLEMENT; FAILURES; FRACTURE MECHANICS; MATERIALS TESTING; NUCLEAR POWER PLANTS; STAINLESS STEEL-410; CHARPY TEST; EXPERIMENTAL DATA; HEAT TREATMENTS; TENSILE PROPERTIES; ALLOYS; CHROMIUM ALLOYS; CHROMIUM STEELS; CORROSION RESISTANT ALLOYS; DATA; DESTRUCTIVE TESTING; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; IMPACT TESTS; INFORMATION; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS; MECHANICAL PROPERTIES; MECHANICAL TESTS; MECHANICS; NUCLEAR FACILITIES; NUMERICAL DATA; POWER PLANTS; STAINLESS STEELS; STEELS; TESTING; THERMAL POWER PLANTS; 220200* - Nuclear Reactor Technology- Components & Accessories; 360103 - Metals & Alloys- Mechanical Properties

Citation Formats

Hiser, A L. Fracture toughness characterization of Type 410 stainless steel: Final report. United States: N. p., 1987. Web.
Hiser, A L. Fracture toughness characterization of Type 410 stainless steel: Final report. United States.
Hiser, A L. Sun . "Fracture toughness characterization of Type 410 stainless steel: Final report". United States.
@article{osti_5747016,
title = {Fracture toughness characterization of Type 410 stainless steel: Final report},
author = {Hiser, A L},
abstractNote = {Type 410 stainless steel has been used as an alternative material for bolts and studs because of its mechanical properties and corrosion resistance. However, failures have occurred in 410 stainless steel that have prompted further studies to characterize the properties of the failed material. After the discovery of failed valve studs by Virginia Power, investigation of the failures focused on improper heat treating of the studs, resulting in temper embrittlement. (The studs were purchased to ASTM specification A 193 Grade B6, with a supplemental requirement of 125 ksi tensile strength.) To assess the fracture properties of the stud material, pieces of several failed studs were sent to Materials Engineering Associates, Inc. Characterization of the material was performed using impact tests (Charpy-V notch specimens), strength tests (tensile specimens), and static fracture toughness tests (compact tension specimens). The strength tests revealed 0.2% offset yield and ultimate strengths exceeding ASTM and Virginia Power requirements, although the reduction-of-area requirement was satisfied in only three of six tests. The impact tests revealed low toughness, with 20 ft-lb and 20% shear not eclipsed until 430/sup 0/F. Test results at 550/sup 0/F indicate an upper shelf in excess of 80 ft-lb. The static fracture toughness tests exhibited cleavage failure from 40/sup 0/F to 200/sup 0/F, with low toughness at 40/sup 0/F and 120/sup 0/F. Higher toughness was observed at 200/sup 0/F, with the onset of the static upper shelf probably occurring between 300/sup 0/F to 400/sup 0/F. 2 refs., 10 figs., 4 tabs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {11}
}

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