발간논문

Home > KJMM 논문 > 발간논문

Vol.29, No.11, 1169 ~ 1178, 1991
Title
Grain Boundary Crack Initiation and Propagation during Creep of Ni Base Superalloy RENE 80
조창용Chang Yong Jo, 박용조Yong Jo Park, 김승언Seung Eon Kim, 김학민Hak Min Kim, 이상래Sang Lae Lee
Abstract
Two kinds of specimens with different microstructure were prepared by changing casting variables in vacuum investment casting. The effect of microstructural difference on the creep behavior, creep crack initiation and creep crack propagation was studied in Ni base superalloy RENE 80. The specimen having fine grained and uniformly distributed carbide exhibited superior creep properties to the large grained specimen tested at 760℃. However above 870℃, two kinds of specimens showed similar creep behavior. At higher temperature creep, crack initiation was principally caused by the reaction between the grain boundary exposed at the surface and the test atmosphere rather than the internal microstructural changes. The crack initiated at the surface propagated to the internal area and this kind of crack propagation leads to fracture of material.
Key Words
| PDF
대한금속∙재료학회 │ (06633) 서울시 서초구 서초대로 56길 38 대한금속∙재료학회 회관 (서초1동 1666-12번지)
Tel : 070-4266-1646 │ FAX : 02-557-1080 │ E-mail : metal@kim.or.kr
Copyright ⓒ 2013 사단법인 대한금속∙재료학회 All rights reserved.