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Fatigue Failure Analysis of Enhanced 35N LT®

Publisher: Fort Wayne Metals, Inc.
Overview:
Results of a study that used Scanning Electron Microscopy (SEM) to determine the causes of fatigue failures in ASTM F562 (cobalt-nickel-chromium-molybdenum alloy) material and the modified 35N LT® material are evaluated in this report. It summarizes the results of SEM analysis testing and introduces the SEM evaluation of the fractured samples. Solid wire and DFT composite wire fatigue test results of earlier studies are represented graphically in an S-N Curve format. Results of the SEM analysis of ASTM F 562 and 35N LT® in both solid and DFT configuration are explained in detail with the help of images of fracture faces and graphical representation of EDS spectrum. Inclusion sizes at each fracture origin area of ASTM F562 DFT are provided in a tabular form. Based on fracture fractography analysis, the report confirms the absence of titanium nitride inclusions in the new alloy 35N LT® at the fatigue failure initiation sites.
TABLE OF CONTENTS
1.Introduction1
2.Test Procedure1-2
3.Solid Wire Analysis2-4
3.1ASTM F 562 Results2-3
3.235N LT® Results3-4
4.DFT® Wire Analysis4
4.1ASTM F 562 DFT® Results4-5
4.235N LT DFT® Results5
5.Summary and Conclusion6
6.References6
7.Tables
7.1Table 1: Inclusion Sizes of ASTM F 562 DFT 5
8.Figures
8.1Figure 1:Solid Wire Fatigue Test S-N Curve1
8.2Figure 2:DFT Composite Wire Fatigue Test S-N Curve1
8.3Figure 3:Fracture Face A, ASTM F 562, 200 Ks, Sample 3 (Magnification 400X)2
8.4Figure 4:Fracture Face B, ASTM F 562, 200 Ksi, Sample 3 (Magnification 400X)2
8.5Figure 5:Fracture Face B, ASTM F 562, 200 Ksi, Sample 3 (Magnification 3000X)3
8.6Figure 6:EDS Spectrum for Typical Fracture Origin Inclusion, Sample 3 Fracture Face A.3
8.7Figure 7:Fracture Face A, 35N LTÒ Alloy, 200 Ksi, Sample 3 (magnification 400X)3
8.8Figure 8:Fracture Face B, 35N LTÒ Alloy, 200 Ksi, Sample 3 (magnification 400X)3
8.9Figure 9:Fracture Face B, 35N LTÒ Alloy, 200 Ksi, Sample 3 (magnification 3000X)4
8.10Figure 10:Fracture Face A, 35N LTÒ Alloy, 250 Ksi, Sample 1 (magnification 500X)4
8.11Figure 11:Fracture Face A, ASTM F 562 DFT, 200 Ksi, Sample 4 (magnification 400X)4
8.12Figure 12:Fracture Face B, ASTM F 562 DFT, 200 Ksi, Sample 4 (magnification 400X)4
8.13Figure 13:Fracture Face B, ASTM F 562 DFT, 200 Ksi, Sample 4 (magnification 10,000X)5
8.14Figure 14:Fracture Face B, ASTM F 562 DFT, 200 Ksi, Sample 45
8.15Figure 15:Fracture Face A, 35N LT DFT, 200 Ksi, Sample 4 (magnification 400X)5
8.16Figure 16:Fracture Face B, 35N LT DFT, 200 Ksi, Sample 4 (magnification 400X)6
8.17Figure 17:Fracture Face A, 35N LT DFT, 200 Ksi, Sample 4 (magnification 1500X)6
8.18Figure 18:Fracture Face B, 35N LT DFT, 200 Ksi, Sample 4 (magnification 1500X)6
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