Effect of orientation on crystallographic cracking in notched nickel-base superalloy single crystal subjected to far-field cyclic compression

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

DOI:https://doi.org/10.1007/BF02647974· OSTI ID:5187766

Aswath, P B ^[1]

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1. Univ. of Texas, Arlington, TX (United States). Dept. of Materials Science and Engineering Program

The effects of crystallographic orientation on the fatigue crack initiation and growth under far-field cyclic compression are discussed in single crystals of nickel-base superalloy MAR-M200. Results indicate that cracking occurs primarily due to planar slip on the [l brace]111[r brace]-type planes. Crystallographic cracking can occur on two or more slip planes simultaneously, but through-thickness cracks are not observed. In addition, it has been shown that the threshold stress intensity for crack initiation shows a strong dependence on orientation. The threshold stress intensity for crack growth in cyclic compression is 5 to 10 times the threshold for crack growth in cyclic tension.

• OSTI ID: 5187766
• 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. 25:2; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CRACK PROPAGATION
CRYSTALS
GRAIN ORIENTATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
MATERIALS
MICROSTRUCTURE
MONOCRYSTALS
NICKEL ALLOYS
NICKEL BASE ALLOYS
ORIENTATION
STRESS INTENSITY FACTORS