| Title |
Hot Deformation Behavior of As-cast Low Nickel Fe-22Cr-9.5Mn-3.3Ni Austenite Steel |
| Authors |
안상연(Sang Yeon Ahn); 송재숙(Jae Sook Song); 홍순익(Sun Ig Hong) |
| DOI |
https://doi.org/10.3365/KJMM.2017.55.7.477 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
high temperature strength; elongation; casting; austenite stainless steel; dynamic recrystallization |
| 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. (Received November 10, 2016; Accepted January 31, 2017) |