Effect of strain rate on the high-temperature low-cycle fatigue properties of a NIMONIC PE-16 superalloy

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02646684· OSTI ID:5187659

Valsan, M; Bhanu Sankara Rao, K; Mannan, S L ^[1]; Sastry, D H ^[2]

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1. Indira Gandhi Centre for Atomic Research, Kalpakkam (India). Materials Development Division
2. Indian Inst. of Science, Bangalore (India). Metallurgy Dept.

NIMONIC PE-16, chosen for the present investigation, is a nickel-iron-base superalloy that has wide application at high temperatures as a material for aircraft ducting systems; gas turbine flame tubes; missile hot components; superheater tubes; and wrapper tubes, clad tubes, and tie rods in nuclear reactors. Strain-rate effects on the low-cycle fatigue (LCF) behavior of a NIMONIC PE-16 superalloy have been evaluated in the temperature range of 523 to 923 K. Total-strain-controlled fatigue tests were performed at a strain amplitude of [+-]0.6 pct on samples possessing two different prior microstructures: microstructure A, in the solution-annealed condition; and microstructure B, in a double-aged condition with [gamma][prime] of 18-nm diameter and M[sub 23]C[sub 6] carbides. The cyclic stress response behavior of the alloy was found to depend on the prior microstructure, testing temperature, and strain rate. A softening regime was found to be associated with shearing of ordered [gamma][prime] that were either formed during testing or present in the prior microstructure. Various manifestations of dynamic strain aging (DSA) included negative strain rate-stress response, serrations on the stress-strain hysteresis loops, and increased work-hardening rate. The calculated activation energy matched well with that for self-diffusion of Al and Ti in the matrix. Fatigue life increased with an increase in strain rate from 3 [times] 10[sup [minus]5] to 3 [times] 10[sup [minus]3]s[sup [minus]1], but decreased with further increases in strain rate.

• OSTI ID: 5187659
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 25:1; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOY-NI43FE33CR16MO3
ALLOYS
ALUMINIUM ALLOYS
BORON ADDITIONS
BORON ALLOYS
CHROMIUM ALLOYS
COBALT ADDITIONS
COBALT ALLOYS
COPPER ADDITIONS
COPPER ALLOYS
CORROSION RESISTANT ALLOYS
DATA
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FATIGUE
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INFORMATION
IRON ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
MOLYBDE
NIMONIC PE16
NUMERICAL DATA
OPTICAL MICROSCOPY
REACTOR MATERIALS
SCANNING ELECTRON MICROSCOPY
USES