발간논문

Home > KJMM 논문 > 발간논문

Vol.34, No.1, 24 ~ 29, 1996
Title
Effects of Solution Treating Time on the Creep - Rupture Properties in Ni - Base Superalloy , Mar - M247LC
나영상Young Sang Na, 이종훈Jong Hun Lee, 최승주Seung Ju Choe, 김학민Hak Min Kim
Abstract
Stress rupture behavior of Mar-M247LC alloy was investigated in the temperature range of 760℃-980℃. The amount of residual eutectic γ` was varied by controlling the solution treating time at 1260℃. As the solution treating time at 1260℃ was increased, the amount of residual eutectic γ` was reduced and the stress-rupture life was increased. Especially the increase of rupture lives are more pronounced in the 760℃/587MPa condition than in the 982℃/152MPa condition. In the 760℃/587MPa rupture is occured by both transgranular and intergranular mechanism. It was observed that the small grains were disappeared during solution treatment because of the reduced amount of residual eutectic γ` associated with the increased solution treating time, which was considered as one of the barriers for the migration of grain boundaries. The improved stress-rupture life was attributed to the disappearance of the isolated small grains as well as the reduction of the amount of residual eutectic γ` which acted as early crack initiation sites.
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.