서지주요정보
Lamellar 조직을 갖는 TiAl 금속간화합물의 고온 저주파 피로 특성에 대한 탄소 첨가의 효과 = The effects of carbon addition on the high temperature low cycle fatigue property in lamellar structured tial alloy
서명 / 저자 Lamellar 조직을 갖는 TiAl 금속간화합물의 고온 저주파 피로 특성에 대한 탄소 첨가의 효과 = The effects of carbon addition on the high temperature low cycle fatigue property in lamellar structured tial alloy / 안우송.
저자명 안우송 ; Ahn, Woo-Song
발행사항 [대전 : 한국과학기술원, 2001].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8011794

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 01015

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Recently, TiAl alloy has been regarded as one of the strongest candidate materials for light and high temperature structural materials. Because of its low density and high creep resistance in this alloy, TiAl alloy is considered suitable for engine valve and turbine blades. Therefore, TiAl alloys are used under conditions where fatigue and creep-fatigue interaction occurs. Most investigators have focussed mainly on fatigue crack growth resistance and fatigue fracture behavior at high cycle fatigue conditions. In the present study, continuous low cycle fatigue and creep-fatigue tests have been conducted and effects of carbon addition are discussed. Firstly, as carbon is added, interlamellar spacings becomes narrow and carbides(P-phase) are precipitated at lamellar interface. When more than 0.3 at.%C is added, microstructure is not observed to be changed. The continuous low cycle fatigue and creep-fatigue lives of TiAl with carbon are found to be longer than those of TiAl without carbon. In the cases of TiAl with carbon, dislocations are spread uniformly in each lamellar colony. This is problems due to lamellar spacing becoming narrow and the number of $α_2/γ$ interfaces increasing. Also, $α_2/γ$ interface acts an impediment for dislocation movement causing many dislocations difficult to move. Moreover, it is observed that dislocations are blocked by the carbide. Therefore, plastic deformations occur uniformly resulting in fatigue lives being increased. In creep-fatigue tests, a change in the microstructure of TiAl alloy without carbon is observed. Many dislocations are generated at $α_2/γ$ interface and $α_2$ phases become thinner. However, the microstructure of TiAl alloy with carbon is not observed to be changed. So carbides and many $α_2/γ$ interfaces can act effectively. Namely, TiAl alloy with carbon endures well creep damage.

서지기타정보

서지기타정보
청구기호 {MMS 01015
형태사항 iv, 72 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Woo-Song Ahn
지도교수의 한글표기 : 남수우
지도교수의 영문표기 : Soo-Woo Nam
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 68-72
주제 금속간화합물
피로
크리프-피로
탄소
TiAl
Fatigue
Creep-fatigue
Carbon
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