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Korean Journal of Metals and Materials > Volume 55(7); 2017 > Article
Korean Journal of Metals and Materials 2017;55(7): 477-485. doi: https://doi.org/10.3365/KJMM.2017.55.7.477
니켈감량 Fe-22Cr-9.5Mn-3.3Ni 오스테나이트강 주조재의 고온 변형성
안상연, 송재숙, 홍순익
충남대학교 신소재공학과
Hot Deformation Behavior of As-cast Low Nickel Fe-22Cr-9.5Mn-3.3Ni Austenite Steel
Sang Yeon Ahn, Jae Sook Song, Sun Ig Hong
Department of Nanomaterials Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
Correspondence  Sun Ig Hong ,Tel: +82-42-821-6595, Email: sihong@cnu.ac.kr
Received: 10 November 2016;  Accepted: 31 January 2017.  Published online: 4 July 2017.
ABSTRACT
The hot deformation behavior of as-cast and homogenized Fe-22Cr-9.5Mn-3.3Ni stainless steel was investigated over a temperature range between 600~1,250 ℃. The deformability of the as-cast Fe-22Cr-9.5Mn-3.3Ni steel decreased with increasing temperature up to 850 ℃, and then increased at temperatures between 900 and 1200 ℃ caused by dynamic recrystallization at high temperatures above 900 ℃. At temperatures between 800 and 900 ℃, the discontinuous precipitation of Cr2N and an decrease in ductility were observed in the as-cast steel. The ductility minimum at 850 ℃ in the as-cast Fe-22Cr-9.5Mn-3.3Ni could be associated with cracking at the interface of the lamellar chromium nitrides. The presence of fatal cracking at 1,250 ℃ and the loss of hot ductility can be attributed to the partial melting at austenite grain boundaries at high temperatures.
Keywords: high temperature strength, elongation, casting, austenite stainless steel, dynamic recrystallization
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