Actions for Collaborative Research on Thermo-Mechanical and Isothermal Low-Cycle Fatigue Strength of Ni-Base Superalloys and Protective Coatings at Elevated Temperatures in The Society of Materials Science, Japan (JSMS)

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Collaborative Research on Thermo-Mechanical and Isothermal Low-Cycle Fatigue Strength of Ni-Base Superalloys and Protective Coatings at Elevated Temperatures in The Society of Materials Science, Japan (JSMS) / M. Okazaki, K. Take, K. Kakehi, Y. Yamazaki, M. Sakane, M. Arai, S. Sakurai, H. Kaneko, Y. Harada, A. Itoh, T. Okuda, I. Nonaka, K. Fujiyama, K. Nanba

Conference Author
Thermomechanical Fatigue Behavior of Materials: 4th Volume (4th : 2001 : Dallas, Texas)
Physical Description
1 online resource (15 pages) : illustrations, figures, tables
Additional Creators
Yamazaki, Y., M. Arai, Fujiyama, K., Harada, Y., Itoh, A., Kakehi, K., Kaneko, H., Nanba, K., Nonaka, I., Okazaki, M., Okuda, T., Sakane, M., Sakurai, S., Take, K., American Society for Testing and Materials, and ASTM International
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Summary
Results of collaborative research by ¿̐ưSubcommittee on Superalloys and Coatings¿̐ư in The Society of Materials Science, Japan (JSMS), are presented, which cover the thermo-mechanical fatigue (TMF) and high temperature isothermal low-cycle fatigue (ILCF) strengths of Ni-Base superalloy, substrate alloys and the protective coatings. Three kinds of Ni-base superalloys were selected as the substrate: a single crystal alloy, CMSX-4; a directionally solidified alloy, CM247LC; and a polycrystalline alloy, IN738LC. On these substrate specimens the CoNiCrAlY alloy was coated by 250 ?m in thickness by low pressure plasma spraying, and then aluminized. This process was managed and undertaken by one of member companies of the Subcommittee. The round robin TMF and ILCF tests were carried out under a strain ratio of -1 at temperature ranged between 400 and 900¿̐ưC. In the former the tests were performed under the out-of-phase and diamond phase conditions in which the phase difference between strain and temperature were 180¿̐ư and 90¿̐ư, respectively. It is shown by the round-robin tests that the TMF lives, as well as the ILCF, were strongly dependent on the substrate alloys. Many important, or noteworthy results were also found: e.g., the TMF fracture behavior of the coated specimens revealed some unique characteristics that were hardly deduced from that of the bare specimens. The effect of coating on the ILCF life was strongly dependent on the temperature. It was not reasonable, or difficult to try to estimate the TMF life of the coatings from the ILCF test results. Based on the observations on the crack initiation, propagation and the fracture surface, the effects of the substrate alloy and the coating on the TMF and ILCF lives were discussed.
Dates of Publication and/or Sequential Designation
Volume 2003, Issue 1428 (January 2003)
Subject(s)
Other Subject(s)
ISBN
9780803154780 (e-ISBN)
9780803134676
0803134673
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 10.
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Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2003. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
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Mode of access: World Wide Web.
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