서지주요정보
니켈기 초내열 합금에서 α-W 입자의 석출거동 및 고온강도에 미치는 영향 = The influence of α-W particles on the high temperature strength of Ni-base superalloy
서명 / 저자 니켈기 초내열 합금에서 α-W 입자의 석출거동 및 고온강도에 미치는 영향 = The influence of α-W particles on the high temperature strength of Ni-base superalloy / 김현태.
저자명 김현태 ; Kim, Hyon-Tae
발행사항 [대전 : 한국과학기술원, 1998].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8008360

소장위치/청구기호

학술문화관(문화관) 보존서고

DMS 98002

휴대폰 전송

도서상태

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반납예정일

초록정보

The equilibrium surface equation of gamma prime for nickel base superalloys was suggested by using multiple regression and vector analysis. By application of suggested alloy design technique, precipitation behavior and strengthening effects of gamma prime phase were evaluated for two kinds of designed alloys. The growth of gamma prime phase in the alloys was controlled by volume diffusion of Al or Ti despite high volume fraction of gamma prime phase. Activation energy for the growth of gamma prime phase was estimated to be 272, 277 kJ/mol, respectively. Since the hardness of alloy was not decreased much after long term exposure at high temperature, it was suggested that the high temperature properties of designed alloys would be excellent. The strengthening effect at high temperature were investigated for four kinds of model alloys designed by adding W continually up to above solution limit of alloy system. In the temperature range between 850 and 950℃, it was observed that compression strength was increased due to the presence of alpha W. It was suggested that strengthening by aging at high temperature was influenced by the precipitation and growth of gamma prime phase. The coarsening of gamma prime was proportional to $t^{1/3}$ and was controlled by volume diffusion of Al or Ti element in the alloy. The activation energy for the growth of gamma prime was estimated to be 271, 259, 260, 266 kJ/mol for four kinds of model alloys, respectively. The alpha W was stable phase until 950℃ independent of aging time and was composed of W, Ni, Cr and small amount of Al. While the tensile strength was increased linearly upon volume fraction of alpha W in the alloy, the elongation was decreased.

서지기타정보

서지기타정보
청구기호 {DMS 98002
형태사항 vi, 145 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 1, 합금설계 프로그램. - 2, γ' 평형면 방정식의 중회귀 분석 결과. - 3, 면방정식 결정을 위한 중회귀분석 결과. - 4, Estimation of various for nickel base superalloys
저자명의 영문표기 : Hyon-Tae Kim
지도교수의 한글표기 : 이원종
지도교수의 영문표기 : Won-Jong Lee
학위논문 학위논문(박사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 103-109
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