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Korean Journal of Metals and Materials > Volume 54(11); 2016 > Article
Korean Journal of Metals and Materials 2016;54(11): 838-845. doi: https://doi.org/10.3365/KJMM.2016.54.11.838
CM247LC 초내열합금에서 일방향응고에 따른 응고조직 변화
이정석1, 권석환2, 윤병관2, 장병문2, 정연길1, 이재현1,*
1창원대학교 신소재공학부 메카트로닉스 융합부품소재 연구센터(ERC)
2한국로스트왁스㈜ 기술연구소
Evolution of the Solidification Microstructures in Directionally Solidified CM247LC Rod
Jeongseok Lee1, Seokhwan Kown2, Byunggwan Yoon2, Byungmoon Chang2, Yongil Jung1, Jehyun Lee1,*
1Changwon National University, Department of Materials Science and Engineering, Engineering Research Center (ERC) for Integrated Mechatronics Materials and Components, Changwon 51140, Republic of Korea
2R&D Center, Korea Lost-Wax Co., Gyungi 15074, Republic of Korea
Correspondence  Jehyun Lee ,Tel: +82-55-213-3695, Email: ljh@changwon.ac.kr
Received: 5 October 2015;  Accepted: 24 May 2016.  Published online: 5 November 2016.
ABSTRACT
Directional solidification of CM247LC was performed at a constant growth velocity (300 mm/h) using a Bridgman type furnace. Microstructural features, including the number of grains, PDAS, and EBSD IPF map, were investigated with progressive positions from the starter block. As directional solidification proceeded, the number of grains decreased and PDAS increased. These results indicate that the thermal gradient decreases with distance from the starter block. Thermal gradient changes were estimated by dendrite spacing change in the directionally solidified rod. The EBSD IPF map showed that almost all of the grains were close to the <001> preferred direction, but with heights of about 300 mm from the starter block, some grains at the center of the specimen exhibited quite different crystallographic directions near the gate instead of the preferred direction.
Keywords: Ni base superalloy, solidification, electron backscattering diffraction(EBSD)
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