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Research Papers

Temperature and Load Ratio Effects on Crack-Growth Behavior of Austenitic Superalloys

[+] Author and Article Information
Ajit K. Roy1

Department of Mechanical Engineering, University of Nevada, Las Vegas (UNLV), 4505 Maryland Parkway, P.O. Box 454027, Las Vegas, NV 89154-4027ajit.roy@srnl.doe.gov

Joydeep Pal, Muhammad H. Hasan

Department of Mechanical Engineering, University of Nevada, Las Vegas (UNLV), 4505 Maryland Parkway, P.O. Box 454027, Las Vegas, NV 89154-4027

1

Corresponding author.

J. Eng. Mater. Technol 132(1), 011001 (Nov 02, 2009) (7 pages) doi:10.1115/1.3184027 History: Received February 10, 2009; Revised April 30, 2009; Published November 02, 2009; Online November 02, 2009

The role of temperature and load ratio (R) on the crack propagation rate (da/dN) of Alloys 276 and 617 under cyclic loading was investigated. The results indicate that the rate of cracking was gradually enhanced with increasing temperature when the R value was kept constant. However, the temperature effect was more pronounced at 100150°C. Both alloys exhibited maximum da/dN values at a load range of 4.5 kN that corresponds to an R value of 0.1. The number of cycles to failure for Alloy 276 was relatively higher compared with that of Alloy 617, indicating its slower crack-growth rate. Fractographic evaluation of the broken specimen surface revealed combined fatigue and ductile failures.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

CT specimen showing dimensions

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Figure 3

Optical micrographs of (a) Alloy 276 (HCl+HNO3+CuCl2) and (b) Alloy 617 (Kalling’s reagent)

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Figure 4

da/dN versus ΔK for Alloy 276 (a) at R=0.1, (b) at R=0.2, and (c) at R=0.3

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Figure 5

da/dN versus ΔK for Alloy 617 (a) at R=0.1, (b) at R=0.2, and (c) at R=0.3

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Figure 6

Nf versus temperature (a) at R=0.1, (b) at R=0.2, and (c) at R=0.3

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Figure 7

Nf versus R at different temperatures: (a) Alloy 276 and (b) Alloy 617

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Figure 8

SEM micrographs of (a) Alloy 276 tested at 300°C showing striations and (b) Alloy 276 tested at 300°C showing dimples

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Figure 9

SEM micrographs of (a) Alloy 617 tested at 300°C showing striations and (b) Alloy 617 tested at 300°C showing dimples

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