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RESEARCH PAPERS

Measurement and Microstructural Evaluation of Creep-Induced Changes in Magnetic Properties of a 410 Stainless Steel

[+] Author and Article Information
A. Polar, J. E. Indacochea, M. L. Wang, V. Singh, G. Lloyd

University of Illinois at Chicago, Chicago, Illinois

J. Eng. Mater. Technol 126(4), 392-397 (Nov 09, 2004) (6 pages) doi:10.1115/1.1790542 History: Received July 03, 2003; Revised May 18, 2004; Online November 09, 2004
Copyright © 2004 by
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References

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Figures

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(a) Saturation hysteresis loop of ferromagnetic material depicting changes in the curve with stress changes. (b) Changes in permeability (μ) with applied magnetic field (H) in steel tendons and cables for different applied stresses.
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Effect of cold work on the yield strength of pure iron. The electron micrographs show the corresponding changes in the number and distribution of dislocations [18].
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SEM micrographs of regions in the necked area of the 12.7 mm diameter 410 stainless steel rod. Sample was exposed to creep rupture at 100 MPa/620° C for 120 hours. Arrows point to locations of voids. Carbides were found within the grains and the grain boundaries.
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Magnetic hysteresis curves of the as-received and creep tested specimens for the 12.7 mm diameter 410-martensitic stainless steel, showing differences detected for different locations on sample. Measurements were made at room temperature and zero nominal.
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Magnetic hysteresis curves of the as-received and creep-tested specimens. Intermediate Creep: 100 hrs @ 500° C, 100 MPa; Full Creep: 49 hrs @ 620° C, 200 MPa. Magnetic measurements were made at room temperature and zero nominal stress.
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X-ray patterns obtained for the as-received 410-martensitic stainless steel and two creep samples
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Schematic of the effect of cell distortion of a BCC cell along the c-axis and corresponding x-ray patterns for the BCC and BCT unit cells
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Scanning electron micrographs of the 410 martensitic steel depicting the carbide population. (a) As-received specimen, and (b) specimen crept to failure, 49 hours at 200 MPa/620° C.
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Optical micrographs of the 410 martensitic steel specimens submitted to creep. (a) As-received, (b) intermediate crept, and (c) crept to failure.

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