| タイトル | Effects of High-Temperature Exposures on the Fatigue Life of Superalloy Udimet(Registered Trademark) 720 |
| 本文（外部サイト） | http://hdl.handle.net/2060/20020076127 |
| 著者（英） | Browning, Paul F.; Telesman, Jack; Kantzos, Peter T.; Sweeney, Joseph W.; Gabb, Timothy P. |
| 著者所属（英） | NASA Glenn Research Center |
| 発行日 | 2002-07-01 |
| 言語 | eng |
| 内容記述 | The purpose of this study was to examine the effects of extended exposures on the near-surface fatigue resistance of a disk superalloy. Powder metallurgy processed, supersolvus heat-treated Udimet 720 (U720) fatigue specimens were exposed in air at temperatures from 650 to 705 C for 100 hr to over 1000 hr. They were then tested using conventional fatigue tests at 650 C to determine the effects of exposure on fatigue resistance. The exposures reduced life by up to 70% and increased the scatter in life, compared to unexposed levels. Fractographic evaluations indicated the failure mode was shifted by the exposures from internal to surface crack initiations. The increased scatter in life was related to the competition between internal crack initiations at inclusions or large grains producing longer lives, and surface crack initiations at an environmentally affected surface layer producing shorter lives. |
| NASA分類 | Aircraft Propulsion and Power |
| レポートNO | E-13354
NAS 1.15:211570
NASA/TM-2002-211570 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/224379 |
