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A Study of Microdeformation and Creep-Fatigue Damage using Acoustic Emission Technique

Published online by Cambridge University Press:  21 February 2011

Yunxu Liu  and
Xingren Li
Yunxu Liu
Affiliation:
Jilin Institute of Technology, Changchun, 130012, China
Xingren Li
Affiliation:
Jilin Institute of Technology, Changchun, 130012, China
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Abstract

This paper deals with the relationship between the plastic deformation damage and microstructure by means of Acoustic Emmission. The plastic deformation behavior of AISI 4340 steel of various microstructures was investigated in both the tensile and creep-fatigue testings with a view to providing new insights into properties of high performance steel. Based on Theory of Damage Mechanics, a creep-fatigue law was derived and formulated. The reason of early failure and the service life prophecy of high strength steels was studied.

The damage micromechanism of four stages was studied by the optical microscope, scanning electron microscope, and microhardness tester. It seems that the nucleation and the growth of the voids at the martensiteferrite interface is the dominant mechanism of damage. The monitoring of Acoustic Emmission indicated that the plastic deformation did not appear in the circulating hardening stage. But in the circulating softening stage, the accumulation of the plastic deformation and the creep-fatigue damage become more and more severe. The total energy of Acoustic Emmission was successfully applied to measure the degree of the damage caused by the plastic deformation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 142: Symposium U – Nondestructive Monitoring of Materials Properties , 1988 , 159
Copyright
Copyright © Materials Research Society 1989

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References

1. Lamaitre, J., and Plumtree, A., “Application of Damage Concepts to Predict Fatigue Failure”, ASME J. of Eng. Materials and Technology, Vol.101, July 1979, p 284–292.Google Scholar
2. Smith, K.N., Watson, P., and Topper, T.H., “A Stress-Strain Function for the Fatigue of Metals”, J. of Materials, Vol. 5, No.4, Dec. 1970, p 767–778.Google Scholar
3. Starkey, M.S. and Irving, P.E., “The Influence of Microstructure on Fatigue Crack Initiation in Spheroidal Graphite Cast Iron”, Proc. Int. Symp. on Low Cycle Fatigue Strength and Elasto-plastic Behavior of Metals, Stattgart, 1979.Google Scholar
4. Gilbert, G.N., “Factors Relating to the Stress/Strain Properties of Cast Iron”, J. of the British Cast Iron Res. Association, Vol.6, No. 11, 1957, p 546–588.Google Scholar
5. Fash, J.W. and Socie, D.F., “Fatigue Behavior and Mean Effects in Grey Cast Iron”, Int. J. of Fatigue, Vol. 4, No. 3, 1982, p 137–142.CrossRefGoogle Scholar
6. Sadananda, K. and Shahinian, P., “Creep Crack Growth in Alloy 718”, Met. Trans. A, Vol.8A, 1977, p 439.CrossRefGoogle Scholar
7. Boettner, R.C., Laird, C., and Meevily, A.J., “Crack Nuceation and Srowth in High Strain Low Cycle Fatigue”, TMS-AIME Trans., Vol.233, 1965, p 379.Google Scholar
8. Min, E.K. and Raj, R., “A New Method for Fatigue Testing at Elevated and Room Temperatures”, J. of Test and Evaluation, September, 1977.Google Scholar
9. Chrzahowski, M., “Use of the Damage Concept in Describing Creep-Fatigue Interaction and Prescribed Stress”, International Journal of Mechanical Science, Vol.18, 1976, p 69–73.CrossRefGoogle Scholar
10. Wilsdorf, D.K., “Dislocation Behavior in Fatigue”, Materials Science and Engineering, Vol.39, 1979, p 231–245.Google Scholar