| 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 |
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Received: 10 November 2016; Accepted: 31 January 2017. Published online: 4 July 2017. |
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| ABSTRACT |
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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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